Entries |
Document | Title | Date |
20080212915 | Nested modulator - A nested modulator is provided where the circuit arrangement of modifying electrodes including signal electrodes is simplified, and at the same time, the drive voltage can be lowered. | 09-04-2008 |
20080219614 | SEMICONDUCTOR OPTICAL MOTULATOR - Semiconductor optical modulator devices exhibiting improved chirp characteristics are constructed from a Mach-Zehnder structure having resonators positioned within each arm and a number of phases shifters positioned within the arms, and/or resonators. | 09-11-2008 |
20080253711 | High speed optical phase modulator - An optical device includes a phase modulator having a waveguide on a substrate. The phase modulator also includes an n-type region having a proximity to a p-type region that causes formation of a depletion region when a bias is not applied to the modulator. The depletion region is at least partially positioned in the light signal carrying region of the waveguide. The phase modulator is tuned by applying a reverse bias to the phase modulator. The reverse bias changes the size of the depletion region. | 10-16-2008 |
20080260321 | Optical Communication Device And Optical Device - An optical communication device includes a substrate which has electro-optical effect; a first optical modulator which has a pair of waveguides formed in the substrate; a second optical modulator which has a pair of waveguides formed in the substrate; a waveguide coupler which is provided in an output of the first optical modulator, the waveguide coupler being able to couple and branch light propagating through the pair of waveguides of the first optical modulator; and a delay connecting section which gives differential delay to the output branched by the waveguide coupler and inputs the output to the pair of waveguide of the second optical modulator. As a result, the optical communication device and optical device in which insertion loss is reduced compared with the conventional optical modulator can be provided. | 10-23-2008 |
20080298738 | Waveguide type wavelength domain optical switch - A waveguide type wavelength domain optical switch includes an input/output port including at least three waveguide spectrometers stacked in thickness direction, a first lens for collecting light outputted from an input port of the input/output port in one axis direction, a second lens for collecting light outputted from the first lens in a direction orthogonal to the collecting direction of the first lens, and an optical phase modulation cell for reflecting light outputted from the second lens through the second lens and the first lens to an output port of the input/output port. Alternatively, the input/output port may include at least two waveguide spectrometers and a waveguide optical coupler circuit stacked in thickness direction | 12-04-2008 |
20080304786 | Semiconductor optoelectronic waveguide - The present invention relates to a semiconductor optoelectronic waveguide having a nin-type hetero structure which is able to stably operate an optical modulator. On the upper and lower surfaces of the core layer determined for the structure so that electro-optical effects are effectively exerted at an operating light wavelength and are provided with intermediate clad layers having a band gap which is greater than that of the core layer | 12-11-2008 |
20080317399 | OPTICAL WAVEGUIDE DEVICE - An optical waveguide device is disclosed wherein the modulation efficiency for a driving voltage is improved. The optical waveguide device includes a substrate having an electro-optic effect, an optical waveguide formed on the substrate, an electrode section adapted to supply an electric field for carrying out phase modulation synchronized with a clock signal to the optical waveguide, and a Mach-Zehnder interferometer connected to the downstream side of the optical waveguide and including two branching waveguides having optical lengths different from each other. | 12-25-2008 |
20090003755 | Systems and methods for integrated optical circuitry for high data rate optical transmission and reception - Embodiments include systems and methods for integrated circuitry optical modulation. In one embodiment, an integrated circuit comprises an optical waveguide enabling multi-level modulation. The embodiment comprises an optical waveguide with integrated circuit modulators. An optical waveguide is split into at least two branches so that modulation can be imposed in each branch. In one embodiment, the branches are combined to produce an optical signal path in which additional modulation is imposed. In an embodiment of an integrated circuit optical demodulator, a received modulated optical signal is divided into branches and demodulated. Embodiments provide a single integrated circuit for multi-level modulation, thereby avoiding the disadvantages of modulation using separate discrete components. Also, a single integrated circuit for multi-level demodulation is provided. | 01-01-2009 |
20090003756 | OPTICAL DEVICE - An optical device including (a) a substrate having an electro-optic effect; (b) a modulating optical waveguide formed on a surface layer portion of said substrate and forming an interference optical modulator for modulating input light; (c) an output optical waveguide formed on said surface layer portion of said substrate and connected to a downstream side portion of said modulating optical waveguide; and (d) a branching monitoring section for monitoring branched light of light propagated along said output optical waveguide and emitted from an outgoing end face of said substrate. The output waveguide has a reduced width region in which the waveguide width is reduced. | 01-01-2009 |
20090003757 | Waveguide-Type Broadband Optical Isolator - A waveguide-type broadband optical isolator according to the present invention, comprising: a reciprocal phase shifter which makes a phase difference 3π/2 between a first light wave propagating through a first waveguide and a second light wave propagating through a second waveguide, with a fundamental operating wavelength λ, and a nonreciprocal phase shifter which provides a phase difference π/2 for forward propagating waves and a phase difference −π/2 for backward propagating waves. | 01-01-2009 |
20090022445 | NANOPHOTONIC DEVICES IN SILICON - Systems and methods for manipulating light with high index contrast waveguides clad with substances having that exhibit large nonlinear electro-optic constants χ | 01-22-2009 |
20090022446 | OPTICAL MODULATION ELEMENT AND OPTICAL MODULATION DEVICE HAVING THE SAME - An optical modulation element includes a waveguide defined based on a defect in a photonic crystal, a carrier conducting region for conducting a carrier to the waveguide, an electrode for injecting a carrier into the carrier conducting region, and a current control unit for controlling the quantity of carrier to be conducted to the waveguide, wherein the photonic crystal and the electrode are made of a material containing TiO | 01-22-2009 |
20090022447 | Method for generating a high-frequency signal and apparatus for generating a high-frequency signal - A method for generating a high-frequency signal includes the steps of entering an optical pulse to a wavelength filtering device and generating modulating light having periodic wavelength intervals, and inputting the optical pulse outputted from the wavelength filtering device to a wavelength dispersive device to subject the optical pulse to treatment of different speeds according to the wavelength, and separating the optical pulse into time pulses independent with respect to the wavelength. | 01-22-2009 |
20090041403 | Optical Modulator - Herein disclosed is an optical modulator, comprising: a substrate ( | 02-12-2009 |
20090067771 | High Efficient Silicon-on-Lithium Niobate Modulator - A modulator includes an electro-optical substrate and a first and second waveguide formed of a doped semiconductor material positioned on a surface of an electro-optical substrate forming a slot therebetween. A doping level of the semiconductor material being chosen to make the first and second waveguide conductive. A dielectric material is positioned in the slot which increases confinement of both an optical field and an electrical field inside the slot. A refractive index of the semiconductor material and a refractive index of the dielectric material positioned in the slot being chosen to reduce the Vπ·L product of the modulator. | 03-12-2009 |
20090067772 | MICROWAVE PHOTONIC DELAY LINE WITH SEPARATE TUNING OF OPTICAL CARRIER - This invention provides a tunable delay of an optical signal having a carrier with an angular frequency ω | 03-12-2009 |
20090074346 | Hybrid Electro-Optic Polymer/Sol-Gel Modulator - A hybrid EO polymer/sol-gel modulator in which the sol-gel core waveguide does not lie below the active EO polymer waveguide increases the higher electric field/optical field overlap factor Γ and reduces inter-electrode separation d thereby lowering the modulator's half-wave drive voltage Vπ, reducing insertion loss and improving extinction. | 03-19-2009 |
20090080826 | JUNCTION FIELD EFFECT TRANSISTOR GEOMETRY FOR OPTICAL MODULATORS - An apparatus for controlling a signal includes an optical waveguide having a variable refractive index; an active device formed within the waveguide, the device having three electrodes, a drain, a source and a gate; and wherein the device is located within the waveguide so that current flowing from the drain to the source changes the refractive index. | 03-26-2009 |
20090092350 | RESONATOR-ASSISTED CONTROL OF RADIO-FREQUENCY RESPONSE IN AN OPTICAL MODULATOR - In one embodiment, an optical modulator has a Mach-Zehnder interferometer (MZI) and an optical resonator coupled, via a tunable optical coupler, to one of the MZI internal arms. The optical resonator induces in the MZI frequency-dependent optical losses characterized by a comb of spectral resonances. The coupling strength between the optical resonator and the MZI set by the optical coupler controls the magnitude of the loss due to the resonances, while one or more optical phase shifter located in the optical resonator controls the spectral position of the resonances. Either the optical coupler or the optical phase shifter, or both, can be tuned to adjust the modulator's radio-frequency response curve. | 04-09-2009 |
20090097795 | OPTICAL MODULATION DEVICE - Light having components of frequencies f | 04-16-2009 |
20090103850 | Silicon-based optical modulator for analog applications - A silicon-insulator-silicon capacitive (SISCAP) optical modulator is configured to provide analog operation for applications which previously required the use of relatively large, power-consuming and expensive lithium niobate devices. An MZI-based SISCAP modulator (preferably a balanced arrangement with a SISCAP device on each arm) is responsive to an incoming high frequency electrical signal and is biased in a region where the capacitance of the device is essentially constant and the transform function of the MZI is linear. | 04-23-2009 |
20090148095 | SYSTEM AND METHOD FOR OPTICAL BEAM STEERING USING NANOWIRES AND METHOD OF FABRICATING SAME - An apparatus and a method for steering optical frequency beams using nanowire. A method includes providing one or more nanowire waveguide arrays, generating an optical frequency beam, wherein the optical frequency beam is incident on the one or more nanowire waveguide arrays, controlling the one or more nanowire waveguide arrays to produce a phase delay in the optical frequency beam as it traverses the nanowire waveguide array, wherein the phase delay causes the optical frequency beam to deflect upon exiting the one or more nanowire waveguide arrays, and steering the optical frequency beam exiting the one or more nanowire waveguide arrays by increasing or decreasing the phase delay, wherein the angle of deflection of the exiting optical frequency beam is determined by the amount of phase delay. | 06-11-2009 |
20090169148 | QAM optical modulators - An exemplary optical modulator includes an interferometer. The interferometer includes an input optical coupler, an output optical coupler, and two or more controllable optical waveguides. Each controllable optical waveguide connects the input optical coupler to the output optical coupler and has an electro-absorption modulator along a segment thereof. Two of the controllable optical waveguides are connected to transmit to an output of the output optical coupler light of substantially different maximum amplitude. | 07-02-2009 |
20090208162 | UNIT-CELL ARRAY OPTICAL SIGNAL PROCESSOR - This invention provides a versatile unit cell as well as programmable and reconfigurable optical signal processors (such as optical-domain RF filters) that are constructed from arrays of those unit cells interconnected by optical waveguides. Each unit cell comprises an optical microdisk, an optical phase shifter, and at least one input/output optical waveguide, wherein the microdisk and the phase shifter are both optically connected to a common waveguide. | 08-20-2009 |
20090214150 | INTEGRATED POLARIZATION SPLITTER/COMBINER - Provided is an apparatus and method for use thereof. The apparatus, in one embodiment, includes a 1x2 coupler in communication with a waveguide. The 1x2 coupler, in this embodiment, is configured to separate an input finite bandwidth optical signal provided from the optical waveguide into two similar optical signals. Input ends of first and second waveguide arms, in one embodiment, are in communication with the 1x2 coupler and configured to receive ones of the input optical signals. An inherent birefringence of each of the first and second waveguide arms may be substantially similar. Moreover, the first and second waveguide arms have different physical path lengths that differ by an amount (ΔL). Additionally, a 2x2 coupler may be in optical communication with an output end of the first and second waveguide arms and configured to provide an output TE polarization and an output TM polarization. | 08-27-2009 |
20090220185 | LIGHT MODULATING DEVICE - The present invention provides an MZ light modulator that can be operated with both of a negative chirp characteristic and a zero chirp characteristic by a single device. The MZ light modulator has first and second waveguides that respectively waveguide two branched lights equal in intensity and perform optical phase modulation by application of first and second modulation voltage signals. Core layers to which modulating electric fields of the first and second waveguides are applied, are different in thickness from each other. The first and second modulation voltage signals are push-pull signals opposite in phase to each other and are different in center voltage from each other. | 09-03-2009 |
20090232440 | DSB-SC MODULATION SYSTEM CAPABLE OF ERASING CARRIER AND SECONDARY COMPONENT - It is an object of the present invention to provide an optical modulation system capable of suppressing a carrier component (f | 09-17-2009 |
20090290830 | OPTICAL PHASE MODULATOR - The invention provides an optical phase modulator having a substrate made of an electro-optical material, a signal electrode provided on the substrate and first and second ground electrodes provided on both sides of the signal electrode. The electrodes are provided so that a size of the first gap between the first ground electrode and the signal electrode is smaller than a size of a second gap between the second ground electrode and the signal electrode. Furthermore, an optical waveguide is provided in the first gap as an optical phase modulator and not provided in the second gap. A driving voltage required for the phase adjustments is thereby lowered, the impedance matching is easily made and excellent radio frequency property can be realized. | 11-26-2009 |
20090290831 | Junction Field Effect Transistor Geometry for Optical Modulators - An optoelectronic apparatus for controlling a signal includes an optical waveguide having a variable refractive index; an active device formed within the waveguide, the device having three electrodes, a drain, a source and a gate; and wherein the device is located within the waveguide so that current flowing from the drain to the source changes the refractive index. | 11-26-2009 |
20090310900 | SUPER FLAT OPTICAL FREQUENCY COM SIGNAL GENERATOR - An optical frequency COM generator generating an optical frequency COM having flat spectrum characteristics using a single modulator. The optical frequency COM generator has a drive signal system ( | 12-17-2009 |
20090310901 | High speed optical modulator - The modulator includes an optical waveguide positioned on a base. The waveguide is configured to guide a light signal through a light signal-carrying region of a light-transmitting medium. The light signal-carrying region is a region of the waveguide where a fundamental and higher order modes of the light signal are constrained within the waveguide. The modulator also includes a bipolar junction transistor formed in the light-transmitting medium. The bipolar junction transistor is positioned such that causing current to flow through the transistor causes charge carriers to be introduced into the light signal-carrying region of the waveguide. | 12-17-2009 |
20100014801 | Multilevel light intensity modulator - In a multilevel light intensity modulator of the invention, input light is branched into n (n is an integer of 2 or more), and respectively sent to n branching waveguides. On the branching waveguides are respectively provided MZI light modulating sections. The MZI light modulating sections branch the input light into two at a branching ratio different from 0.5:0.5, and respectively output a binary optical signal with a quenching ratio being deteriorated, by on/off driving with a binary electric signal. Then by coupling the light output from the MZI light modulating sections, an optical signal with the light intensity modulated to a 2 | 01-21-2010 |
20100027936 | TUNEABLE ELECTRO-OPTIC MODULATOR - A tuneable electro-optic modulator ( | 02-04-2010 |
20100040322 | INTEGRATED ELECTRO-OPTIC DEVICE AND METHOD OF MAKING - An electro-optic polymer semiconductor integrated circuit includes one or more doped regions configured to drive one or more electrodes, and the electrodes are configured to drive a juxtaposed electro-optic core. The assembly may include a planarization layer disposed at least partially coplanar with the electrodes. The circuit may include an integrated multiplexer, driver configured to receive a signal from the multiplexer, at least one high speed electrode configured to be driven by the driver and modulate light energy passed through a hyperpolarizable poled chromophore regions disposed near the high speed electrode. The circuit may include a calibration storage circuit. The circuit may include, during fabrication, structures to provide voltage to a buried electrode and a shield to prevent damage from the poling field. | 02-18-2010 |
20100054654 | Optical Modulation Device - Herein disclosed is an optical modulation device, comprising: a substrate | 03-04-2010 |
20100067841 | OPTICAL DEVICE AND OPTICAL TRANSMITTER - The optical device includes an outer Mach-Zehnder interferometer having two outer arm waveguides; and two multilevel modulators, each formed on one of the outer arm waveguides, which perform multilevel modulation on input light independently of each other, one of the multilevel modulators including an inner Mach-Zehnder interferometer having two inner arm waveguides, and two signal electrodes which provide electric fields that are to interact with light propagates through the inner Mach-Zehnder interferometer, the inner Mach-Zehnder interferometer or the signal electrodes cross an even number of times at crossing points so as to alternately interact with the electric fields provided by the signal electrodes, a part of a light propagation region of the inner arm waveguides which region has a boundary defined by at least one of the crossing points forms a polarization inversion region. The optical transmitter includes the above optical device. | 03-18-2010 |
20100111466 | QAM optical modulators - An exemplary optical modulator includes an interferometer. The interferometer includes an input optical coupler, an output optical coupler, and two or more controllable optical waveguides. Each controllable optical waveguide connects the input optical coupler to the output optical coupler and has an electro-absorption modulator along a segment thereof. Two of the controllable optical waveguides are connected to transmit to an output of the output optical coupler light of substantially different maximum amplitude. | 05-06-2010 |
20100150495 | OPTICAL SWITCH SYSTEM USING OPTICAL INTERFERENCE - It is an object of the present invention to provide an optical switch system using optical interference. An optical switch system ( | 06-17-2010 |
20100158428 | OPTICAL MODULATOR - Herein disclosed is an optical modulator, comprising: an optical waveguide ( | 06-24-2010 |
20100158429 | RESONANT OPTICAL MODULATORS - Disclosed are optical modulators that have two coupling paths or structures between an input port to an output port, at least one of which includes an optical resonator. | 06-24-2010 |
20100215309 | ELECTRICAL CONTACTS ON TOP OF WAVEGUIDE STRUCTURES FOR EFFICIENT OPTICAL MODULATION IN SILICON PHOTONIC DEVICES - A phase modulation waveguide structure includes one of a semiconductor and a semiconductor-on-insulator substrate, a doped semiconductor layer formed over the one of a semiconductor and a semiconductor-on-insulator substrate, the doped semiconductor portion including a waveguide rib protruding from a surface thereof not in contact with the one of a semiconductor and a semiconductor-on-insulator substrate, and an electrical contact on top of the waveguide rib. The electrical contact is formed of a material with an optical refractive index close to that of a surrounding oxide layer that surrounds the waveguide rib and the electrical contact and lower than the optical refractive index of the doped semiconductor layer. During propagation of an optical mode within the waveguide structure, the electrical contact isolates the optical mode between the doped semiconductor layer and a metal electrode contact on top of the electrical contact. | 08-26-2010 |
20100247025 | OPTICAL ELEMENT - Disclosed is an optical element which includes a support substrate and a thin plate of single crystal stacked on the support substrate through a thermoplastic adhesive, having the advantages of easily regulating the phase of light waves and restoring the regulated state to the original state. The optical element includes a support substrate | 09-30-2010 |
20100284645 | SEMICONDUCTOR THERMOOPTIC PHASE SHIFTER - An optical device comprising a waveguide on a planar substrate. The waveguide includes a semi-conductive cladding layer that contacts electrical leads which are coupleable an electrical power source for controlling a refractive index of the cladding layer by passing electrical power through the cladding layer. | 11-11-2010 |
20100290732 | COMPACT ELECTROOPTIC MODULATOR - An apparatus | 11-18-2010 |
20100316325 | OPTICAL PHASE MODULATION ELEMENT AND OPTICAL MODULATOR USING THE SAME - Provided is a small-size optical phase modulation element and an optical modulator using it. The optical phase modulation element includes a Plasmon waveguide having a clad made of a metal material having a complex dielectric constant having a negative real part in the used wavelength and a core formed by a dielectric metal material having a complex dielectric constant having a positive real part in the used wavelength. The Plasmon waveguide is connected to an optical waveguide including a clad and a core both having a complex dielectric constant having a positive real part. The core of the Plasmon waveguide and the core of the optical waveguide are formed, at least partially, of the same semiconductor material. The Plasmon waveguide has a function to phase-modulate the incident light when voltage is applied. | 12-16-2010 |
20100316326 | OPTICAL DEVICE HAVING OPTICAL MODULATORS - An optical device includes first and second optical modulators formed on a substrate having electro-optical effect. The first optical modulator includes a first optical waveguide; a first signal electrode configured to provide a first data signal for the first optical waveguide; and a first DC electrode, arranged at an output side of the first signal electrode, and configured to provide first DC voltage for the first optical waveguide. The second optical modulator includes a second optical waveguide; a second signal electrode configured to provide a second data signal for the second optical waveguide; and a second DC electrode provided, arranged at an input side of the second signal electrode, and configured to provide second DC voltage for the second optical waveguide. Input portions of the first and second signal electrodes are arranged at a same side edge of the substrate. | 12-16-2010 |
20100329601 | OPTICAL WAVEGUIDE DEVICE - An optical waveguide device includes a substrate of a ferroelectric material, at least a pair of electrodes | 12-30-2010 |
20110002574 | Optical Devices Having Controlled Nonlinearity - An optical device is provided having a solid state nonlinear material with a nanostructured extent, in at least one dimension, that is less than about 10 nm or that is at a temperature of less than about 77 K. An electronic band gap, E | 01-06-2011 |
20110002575 | WAVEGUIDE-TYPE SEMICONDUCTOR OPTICAL MODULATOR AND METHOD FOR MANUFACTURING THE SAME - Provided is a traveling-wave type semiconductor optical phase modulator capable of high speed and low voltage operation by improving an n-SI-i-n-type layered structure. A first exemplary aspect of the present invention is a waveguide-type semiconductor optical modulator including: a semiconductor substrate ( | 01-06-2011 |
20110007995 | MACH ZEHNDER MODULATOR - A Mach Zehnder (MZ) modulator ( | 01-13-2011 |
20110044573 | Advanced Modulation Formats for Silicon-Based Optical Modulators - A silicon-based optical modulator is configured as a multi-segment device that utilizes a modified electrical data input signal format to address phase modulation nonlinearity and attenuation problems associated with free-carrier dispersion-based modulation. The modulator is formed to include M separate segments and a digital signal encoder is utilized to convert an N bit input data signal into a plurality of M drive signals for the M modulator segments, where M≧2 | 02-24-2011 |
20110052114 | VERTICAL OPTICALLY EMITTING PHOTONIC DEVICES WITH ELECTRONIC STEERING CAPABILITY - An optical photonic device comprising a planar semiconductor substrate having a light-guiding layer thereon, a primary laser light source in said light-guiding layer and a vertical coupler optically coupled to the primary laser light source by waveguide portions of the light-guiding layer. The vertical coupler is configured to receive a light beam from the primary laser light source and redirect the light beam in a direction that is substantially perpendicular to a surface of the planar substrate. | 03-03-2011 |
20110064351 | OPTICAL PHASE MODULATOR AND OPTICAL PHASE MODULATING DEVICE - The optical phase modulator of the present invention comprises: a main Mach-Zehnder interferometer having first and second main optical waveguide path arms, and whose initial phase difference in the used wavelength is π; a first sub Mach-Zehnder interferometer having first and second sub optical waveguide path arms that are formed in said first main optical waveguide path arm, and whose initial phase difference in the used wavelength is 0; and a second sub Mach-Zehnder interferometer having third and fourth sub optical waveguide path arms that are formed in said second main optical waveguide path arm, and whose initial phase difference in the used wavelength is 0. Of each of the main optical waveguide path arms and first through fourth sub optical waveguide path arms, at least the portions where high-frequency electrodes are formed is constructed using semiconductor waveguide paths, and are capable of reducing the effects of frequency chirping caused by an orthogonal component that occurs due to light absorption in the semiconductor. | 03-17-2011 |
20110097029 | Super Flat Optical Frequency Comb Signal Generator - It is an object of the present invention to provide an optical frequency comb generator to generate an optical frequency comb with flat spectral properties using a single modulator. The optical frequency comb generator comprises: a drive signal system ( | 04-28-2011 |
20110097030 | LIGHT CONTROL ELEMENT AND OPTICAL WAVEGUIDE CIRCUIT - A light control element includes three or more silicon thin-film layers ( | 04-28-2011 |
20110103735 | MACH-ZEHNDER WAVEGUIDE TYPE OPTICAL MODULATOR - It is intended to suppress the influence of a photorefractive phenomenon or the coupling of stray light to signal light. A Mach-Zehnder waveguide type optical modulator is provided which includes a thin plate | 05-05-2011 |
20110135242 | TRAVELING WAVE MACH-ZEHNDER OPTICAL DEVICE - A Mach-Zehnder modulator has an optical splitting element splitting an input optical signal into two optical signals that are conveyed by two optical waveguide arms, and an optical combining element combining the two optical signals into an output optical signal. Two traveling wave electrodes (TWEs) carry an electrical modulation signal to induce a change in phase of these two optical signals, and include a number of pairs of modulation electrodes positioned adjacent to the waveguide arms. At least some of the electrodes in one waveguide arm have a different shape (e.g., length or width) than the electrodes in the other waveguide arm to alter the effectiveness of the electrodes in inducing a phase change in the two optical signals. | 06-09-2011 |
20110135243 | ELECTRO-OPTIC DEVICE - Provided is an electro-optic device. The electro-optic device includes an input Y-branch comprising a first input branch and a second input branch, an output Y-branch comprising a first output branch and a second output branch, a first optical modulator and a second optical modulator connected in series between the first input branch and the first output branch, and a third optical modulator connecting the second input branch to the second output branch. The first optical modulator comprises a PIN diode, and each of the second optical modulator and the third optical modulator comprises a PN diode. | 06-09-2011 |
20110158575 | EXTRAORDINARY LIGHT TRANSMISSION APPARATUS AND METHOD - An optical apparatus that provides extraordinary light transmission through a sub-wavelength-sized light transmitting region of the apparatus includes a core region of dielectric material having a complex dielectric constant, ε | 06-30-2011 |
20110158576 | OPTICAL WAVEGUIDE MODULATOR - The invention relates to waveguide optical modulators wherein two or more waveguides are modulated with specific modulation strengths using a single straight signal electrode or a single multi-segment signal electrode. Modulation strengths for each of a plurality of waveguides modulated by a single multi-segment electrode are matched over a wide modulation frequency range. Linearized output characteristics with respect to second and third order distortions arc achieved in one aspect of the invention. | 06-30-2011 |
20110158577 | ADVANCED MODULATION FORMAT USING TWO-STATE MODULATORS - An optical modulator device comprising an interferometer. The interferometer includes an input optical coupler, an output optical coupler, and two or more controllable optical waveguides located on a substrate. Each controllable optical waveguide connects the input optical coupler to the output optical coupler and has two-state modulator along a segment thereof. The two or more controllable optical waveguides are connected to transmit an output to the output optical coupler, substantially different light amplitudes and/or phases when the two-state modulators of the two controllable optical waveguides are in different states, as driven by data streams having different information content. The two or more controllable optical waveguides are configured to modulate the light amplitudes and/or phases in a substantially same manner when the two-state modulators are in identical states. | 06-30-2011 |
20110188799 | OPTICAL DEVICE AND OPTICAL TRANSMITTER - An optical device includes a substrate having an electro-optical effect; a main waveguide provided on the substrate; a first Mach-Zehnder part having first waveguides provided on the substrate and coupled with the main waveguide, and first DC electrodes provided between the first waveguides and on the first waveguides and used to generate DC electric fields in the first waveguides; and second Mach-Zehnder parts respectively associated with the first waveguides and comprising second waveguides coupled with each of the first waveguides and second DC electrodes used to generate DC electric fields in the second waveguides, at least one of the second Mach-Zehnder parts being configured to have no second DC electrode provided between the second waveguides and have the second DC electrodes on the second waveguides. | 08-04-2011 |
20110188800 | OPTICAL MODULATION DEVICE AND OPTICAL MODULATION METHOD - In an optical modulation device, an inverter inverts power of a modulation signal light and generates the inverted modulation signal light. A first nonlinear medium phase-modulates a modulated light by a nonlinear optical effect of the modulation signal light. A second nonlinear medium phase-modulates the modulated light by the nonlinear optical effect of the inverted modulation signal light. An optical interference part controls interference between output light from the first nonlinear medium and that from the second nonlinear medium, and produces the phase-modulated modulated light. | 08-04-2011 |
20110194801 | OPTICAL DEVICE USING NEGATIVE GOOS-HANCHEN SHIFT - Provided is an optical device delaying light by using negative Goos-Hanchen shift. The optical device includes an optical waveguide adapted to guide and emit an incident light, a first reflection layer disposed at one side of the optical waveguide, and a second reflection layer disposed at the other side of the optical waveguide. At least one of the first and the second reflection layers is made of a material having characteristics of negative Goos-Hanchen shift. | 08-11-2011 |
20110194802 | MACH-ZEHNDER MODULATOR - A mach-zehnder optical modulator includes a substrate having electrooptical effect, wherein: the substrate has an inputting waveguide portion, two intermediate waveguide portions, an outputting waveguide portion and a sub optical waveguide portion, the inputting waveguide portion being branched and coupled to the two intermediate waveguide portions, the two intermediate waveguide portions being combined and coupled to the outputting waveguide portion, the sub optical waveguide being provided on at least one side of the outputting optical waveguide portion and having a given distance from the outputting optical waveguide portion, the sub optical waveguide portion guiding an off-light emitted from a combining portion of the two intermediate waveguide portions; and a width of a starting point of the sub optical waveguide portion is larger than the outputting waveguide portion. | 08-11-2011 |
20110194803 | OPTICAL MODULATOR FORMED ON BULK-SILICON SUBSTRATE - An optical modulator comprises a bulk-silicon substrate comprising a trench having a predetermined width and a predetermined depth. A bottom cladding layer is formed in the trench, and a plurality of waveguides and a phase modulation unit are formed on the bottom cladding layer. A top cladding layer is formed on the plurality of waveguides and the phase modulation unit. | 08-11-2011 |
20110222813 | Optical Modulators With Controllable Chirp - A semiconductor-based optical modulator is presented that includes a separate phase control section to adjust the amount of chirp present in the modulated output signal. At least one section is added to the modulator configuration and driven to create a pure “phase” signal that will is added to the output signal and modify the e | 09-15-2011 |
20110222814 | System and Method for Using Planar Device to Generate and Steer Light Beam - The present invention provides a device is provided for use with a first through fourth light beams. The device includes a first through fourth waveguides and first through fourth light scattering portions. The first waveguide has a length and a width and is arranged to receive the first light beam, wherein the length is larger than the width. The second waveguide is parallel with the first waveguide and is arranged to receive the second light beam. The third waveguide is disposed perpendicularly to and intersecting with the first waveguide and the second waveguide. The third waveguide is arranged to receive the third light beam. The fourth waveguide is parallel with the third waveguide and is disposed perpendicularly to and intersecting with the first waveguide and the second waveguide. The fourth waveguide is arranged to receive the fourth light beam. The first light scattering portion is disposed at the intersection of the first waveguide and the third waveguide. The second light scattering portion is disposed at the intersection of the second waveguide and the third waveguide. The third light scattering portion is disposed at the intersection of the first waveguide and the fourth waveguide. The fourth light scattering portion is disposed at the intersection of the second waveguide and the fourth waveguide. The light scattering portions can scatter light normal to the waveguides. | 09-15-2011 |
20110229069 | Planar Waveguide Circuit and Optical Receiver - A planar waveguide circuit comprises a first optical splitter to receive an input optical signal, a second optical splitter to receive a reference optical signal, a first optical signal combiner, and a second optical signal combiner. First and second optical waveguides are provided to couple first and second outputs of the first optical splitter to respective inputs of the first and second optical signal combiners. Third and fourth optical waveguides are provided to couple first and second outputs of the second optical splitter to respective inputs of the first and second optical signal combiners. A phase-shifter is provided located to affect the phase of an optical signal propagating in one of the third and fourth optical waveguides. The first and second optical splitters and the first and second optical signal combiners are arranged such that the first, second, third and fourth optical waveguides do not intersect one another. | 09-22-2011 |
20110229070 | OPTICAL MODULATOR - An optical modulator having a high stability is provided. In the optical modulator according to the present invention, a phase modulation by an electro-optic effect is made on an optical substrate of an electro-optic material while the setting of an operating point by a thermal-optic effect is made on a planar lightwave circuit (PLC) substrate of quartz, silicon, or the like. Such configuration can suppress the influence of thermal drift or the like because no heat is applied directly to the optical substrate of the electro-optic material. In addition, breakage and warpage of the substrate due to heat are also mitigated. Further, quartz used for the PLC has a low thermal conductivity, approximately one-fifth of that of the LN substrate (approximately 1 W/(m·K)), and therefore, a desired phase difference can be maintained with a low power consumption, and thus, the operating point becomes stabilized. | 09-22-2011 |
20110235961 | MACH-ZEHNDER INTERFEROMETER TYPE OPTICAL MODULATOR - A Mach-Zehnder interferometer type optical modulator includes first and third optical waveguides; input and output optical couplers; and a phase shifting section disposed between the input and output optical couplers. The phase shifting section includes first and second optical waveguide structures each including an n-type semiconductor section, a core layer and a cladding layer. The cladding layer of the first optical waveguide structure includes a first section disposed on the core layer, and second and third sections disposed on the first section. The second and third sections are juxtaposed to each other in a direction that intersects a waveguiding direction. The first and second sections are composed of a p-type semiconductor, and the third section is composed of an undoped semiconductor. | 09-29-2011 |
20110243491 | MACH-ZEHNDER INTERFEROMETER TYPE OPTICAL MODULATOR - A Mach-Zehnder interferometer type optical modulator includes a first end facet and a reflecting portion opposing the first end facet; a single optical coupler including input and output ports, the optical coupler being disposed between the first end facet and the reflecting portion; first and second optical waveguides that are connected to the input ports of the optical coupler; third and fourth optical waveguides that are connected to the output ports of the optical coupler; and a phase shifting section disposed between the optical coupler and the reflecting portion. The phase shifting section includes a first optical waveguide structure constituting part of the third optical waveguide; a first upper electrode on the first optical waveguide structure; a second optical waveguide structure constituting part of the fourth optical waveguide; and a second upper electrode on the second optical waveguide structure. | 10-06-2011 |
20110243492 | SILICON BASED OPTICAL MODULATORS AND METHODS OF FABRICATING THE SAME - A silicon based optical modulator apparatus can include a lateral slab on an optical waveguide, the lateral slab protruding beyond side walls of the optical waveguide so that a portion of the optical waveguide protrudes from the lateral slab towards a substrate. | 10-06-2011 |
20110305414 | METHOD AND SYSTEM FOR INTEGRATED POWER COMBINERS - A system for integrated power combiners is disclosed and may include receiving optical signals in input optical waveguides and phase-modulating the signals to configure a phase offset between signals received at a first optical coupler, where the first optical coupler may generate output signals having substantially equal optical powers. Output signals of the first optical coupler may be phase-modulated to configure a phase offset between signals received at a second optical coupler, which may generate an output signal having an optical power of essentially zero and a second output signal having a maximized optical power. Optical signals received by the input optical waveguides may be generated utilizing a polarization-splitting grating coupler to enable polarization-insensitive combining of optical signals. Optical power may be monitored using optical detectors. The monitoring of optical power may be used to determine a desired phase offset between the signals received at the first optical coupler. | 12-15-2011 |
20120027336 | MACH-ZEHNDER MODULATOR - Provided is a Mach-Zehnder modulator. The Mach-Zehnder modulator comprises an input wave guide and an output wave guide arranged on a substrate, a first branch wave guide and a second branch wave guide connected in parallel between the input and output wave guides, and a connecting region configured to connect the first branch wave guide and the second branch wave guide. Each of the first and second branch wave guides comprises first doped regions doped with a first dopant and second doped regions doped with a second dopant having different conductivity from the first dopant, and the connecting region is doped with the first dopant and arranged between the first regions of the first and second branch wave guides. | 02-02-2012 |
20120027337 | OPTICAL MODULATOR - In order to provide an optical modulator capable of suppressing generation of mode mismatching light in the Y-multiplexer in the MZ-type waveguide or mixing of the mode mismatching light with the radiation-mode light or the output light, and separately extracting output light and radiation-mode light, there is provided an optical modulator having a Mach-Zehnder type waveguide on a surface of a dielectric substrate, wherein a waveguide after multiplexing in a Y-multiplexer in an output side of the Mach-Zehnder type waveguide is a multiple mode waveguide | 02-02-2012 |
20120033910 | HIGH DATA-RATE SOI OPTICAL MODULATOR - An electro-optic modulation component is provided, in particular on an SOI (semiconductor-on-insulator) substrate, improved for better performance at data rates above 10 Gb/s. This improvement is obtained by reducing the influence of the capacitive effects of the structure and of its environment, and more particularly in which the influence of the capacitance of the structure itself is limited by reducing the access resistance in the doped regions or the influence of the capacitive effect of the environment is reduced by modifying the structure of the substrate vertically beneath the active region, for example by thinning the silicon substrate or the insulator, or a combination of these features. The invention furthermore relates to a process for fabricating such a component and to a device or system that includes such a component. These improvements are applicable in 3D integration assembly processes and to electronic and optical hybrid circuits. | 02-09-2012 |
20120057815 | OPTICAL MODULATION DEVICE - An optical modulation device of an embodiment includes: a first p-type semiconductor region; a first n-type semiconductor region; a first low-impurity-density semiconductor region formed between the first p-type semiconductor region and the first n-type semiconductor region; a second n-type semiconductor region formed on an outer side of the first p-type semiconductor region via a second low-impurity-density semiconductor region; and a second p-type semiconductor region formed on an outer side of the first n-type semiconductor region via a third low-impurity-density semiconductor region. The carrier density in the first low-impurity-density semiconductor region is changed by current injection. The phase of light propagated through an optical waveguide structure that includes at least part of the first low-impurity-density semiconductor region is modulated. | 03-08-2012 |
20120087617 | OPTICAL MODULATOR AND OPTICAL MODULATING METHOD - An optical modulator includes a modulator that modulates an input light of light by using an input signal. The optical modulator further includes a compensation circuit that compensates the phase of a signal light in accordance with an input current, the signal light being the input light modulated by the modulator. The optical modulator further includes a detector that detects the difference between the phase of the signal light compensated by the compensation circuit and the phase of an input signal that is input to the modulator. The optical modulator further includes an adjustment circuit that adjusts, in accordance with the phase difference detected by the detector, the input current that is input to the compensation circuit. | 04-12-2012 |
20120099813 | Phase Shifter and Electro-Optic Modulation Device Including the Same - A phase shifter includes an optical waveguide, a plurality of impurity regions and a plurality of electrodes. The optical waveguide receives an optical input signal and outputs an optical output signal. The impurity regions include respective charge carriers. The impurity regions are disposed in contact with the optical waveguide at respective contact surface, where at least one of the contact surfaces has a zigzag pattern. The electrodes are connected to the respective impurity regions. Application of an electrical signal to at least one of the electrodes phase-shifts the optical output signal with respect to the optical input signal. Therefore, the phase shifter may efficiently vary a magnitude of the phase shift of the optical output signal. | 04-26-2012 |
20120106888 | OPTICAL MODULATOR - In a nest MZI modulator in which each arm includes a child MZI, the power consumption is reduced. The hybrid integrated-type nest MZI modulator of the embodiment 1a is configured so that, instead of placing a relative phase adjusting section in a parent MZI, a bias electrode Bias 90° in which an electric field is applied in the same direction to the polarization direction in both of the upper and lower arms is placed in each child MZI (see FIG. | 05-03-2012 |
20120134619 | OPTICAL MODULATION APPARATUS, METHOD FOR CONTROLLING OPTICAL MODULATOR, AND CONTROL DEVICE FOR OPTICAL MODULATOR - An optical modulation apparatus including: a Mach-Zehnder optical modulator having two optical waveguides, two output optical waveguides and a join-and-branch portion; a phase adjustment circuit configured to output a phase control signal to phase adjustment electrodes provided respectively on the two optical waveguides; a drive circuit configured to output a modulation signal to modulation electrodes provided respectively on the two optical waveguides as a differential signal, the modulation signal modulating lights propagated in the two optical waveguides; and a signal polarity reversal circuit configured to reverse a polarity of the differential signal to be output from the drive circuit. | 05-31-2012 |
20120134620 | OPTICAL MODULATOR - A Mach-Zehnder optical modulator includes a join-and-branch portion, two light wave guides connected with the join-and-branch portion, two output light waveguides connected with the join-and-branch portion, arm electrodes respectively provided on the two light waveguides, light intensity detection electrodes respectively provided on the two output light waveguides, and a leakage suppression electrode provided between the arm electrodes and the light intensity detection electrodes. | 05-31-2012 |
20120141062 | SYSTEMS AND METHODS FOR DRIVING AN OPTICAL MODULATOR - Systems and methods for driving an optical modulator are provided. In one embodiment, a modulation drive circuit comprises: a balanced impedance network having a first and a second output generated from a first input, and a third and a fourth output generated from a second input, wherein the first and second outputs are balanced with one another, and the third and fourth outputs are balanced with one another; a first differential amplifier, wherein an inverting input of the first differential amplifier couples to the first output of the distribution network and a non-inverting input of the first differential amplifier couples to the third output of the distribution network; and a second differential amplifier, wherein an inverting input of the second differential amplifier couples to the fourth output of the distribution network and a non-inverting input of the second differential amplifier couples to the second output of the distribution network. | 06-07-2012 |
20120155796 | DEVICE FOR PHASE MODULATION - A phase modulator may include a middle layer having a first refractive index, a first surrounding layer of material in contact with the middle layer and having a second refractive index, a second surrounding layer of material in contact with the middle layer and may having a third refractive index, a first electrode in electrical contact with the first surrounding layer, and a second electrode may be in electrical contact with the second surrounding layer. When no voltage is applied across the first electrode and the second electrode, the first refractive index may be greater than the second refractive index and the third refractive index. When a voltage is applied across the first electrode and the second electrode, the first refractive index may be less than the second refractive index within a portion of the phase modulator substantially within an electric field induced by such voltage. | 06-21-2012 |
20120163749 | INTEGRATED CIRCUIT WITH OPTICAL DATA COMMUNICATION - An integrated circuit is configured for optical communication via an optical polymer stack located on top of the integrated circuit. The optical polymer stack may include one or more electro-optic polymer devices including an electro-optic polymer. The electro-optic polymer may include a host polymer and a second order nonlinear chromomophore, the host polymer and the chromophore both including aryl groups configured to interact with one another to provide enhanced thermal and/or temporal stability. | 06-28-2012 |
20120163750 | Planar Polarization Rotator - An optical polarization rotator includes first and second optical waveguide ribs located along a planar surface of a substrate. The second optical waveguide rib is located farther from the surface than the first optical waveguide rib. First segments of the optical waveguide ribs form a vertical stack over the substrate, and second segments of the optical waveguide ribs are offset laterally in a direction along the planar surface. The first and second optical waveguide ribs are formed of materials with different bulk refractive indexes. | 06-28-2012 |
20120195544 | OPTICAL INTERFEROMETER - An optical interferometer for demodulating a differential phase shift keying optical signal includes a planar lightwave circuit and at least one free space delay line optically coupled to the planar lightwave circuit. The planar lightwave circuit has a waveguide splitter, a waveguide coupler, and a phase adjuster. In operation, the splitter splits the optical signal into equal portions, the phase adjuster adjusts the relative phase of the optical signal portions, and the free space delay line provides one-bit delay between the portions of the optical signal. The delayed signals are mixed in the waveguide coupler. The free space delay line can be made variable for adjustment of the bit delay for operation at different bit rates, and/or for optimization of the interferometer performance. | 08-02-2012 |
20120201488 | Phase Shifting Device and a Method for Manufacturing the Same - In an embodiment, a phase shifting device may be provided. The phase shifting device may include a supporting layer and a semiconducting layer disposed above the supporting layer. The semiconducting layer may include a first doped region doped with doping atoms of a first conductivity type and arranged on the supporting layer; and a second doped region doped with doping atoms of a second conductivity type being different from the first conductivity type; wherein the second doped region may be disposed over the first doped region such that a first doped regions junction may be formed in a direction substantially parallel to a surface of the supporting layer and a second doped regions junction may be formed in a direction substantially perpendicular to the surface of the supporting layer. A method of forming a phase shifting device and an electro-optic device may also be provided. | 08-09-2012 |
20120230625 | Optical Modulator - An optical modulator includes: a substrate made of a material having an electro-optical effect; an optical waveguide formed on the substrate; and a modulation electrode for modulating an optical wave propagating through the optical waveguide, wherein emitted light emitted from the optical waveguide is guided by optical fiber, and polarization of the substrate is reversed in a predetermined pattern along the optical waveguide so as to provide waveform distortion having a characteristic opposite to a wavelength dispersion characteristic of the optical fiber. | 09-13-2012 |
20120230626 | Optical Modulator Utilizing Unary Encoding And Auxiliary Modulator Section For Load Balancing - An optical modulator is configured to include multiple modulating sections formed along each arm and create a unary-encoded optical output signal by driving the number of sections required to represent the data value being transmitted (e.g., three sections driven to represent the data value “3”, four sections driven to represent the data value “4”). An auxiliary modulating section, isolated from the optical signal path, is included for creating a path for current flow in situations where only an odd number of modulating sections are required to represent the data. The activation of the auxiliary modulation section minimizes the current imbalance that would otherwise be present along a common node of the arrangement. | 09-13-2012 |
20120230627 | Optical Control Element - An optical control element having a substrate | 09-13-2012 |
20120237156 | OPTICAL MODULATOR, COMMUNICATION SYSTEM, AND COMMUNICATION METHOD - An optical modulator has a first branch and a second branch, both being connectable to an input, in particular to a light source. The first branch has an amplitude modulator and a phase shifter, and the amplitude modulator is operable by a first signal that is substantially sinusoidal. The second branch has an amplitude modulator that is operable by a second signal that is substantially 90 degree phase shifted to the first signal. A combining unit with two inputs and two outputs combines the optical fields of the first and second branches. Each output is arranged to supply an optical carrier. A combined optical modulator is formed with at least one such optical modulator. Further, there is provided a method for providing several optical carriers based on an input signal. | 09-20-2012 |
20120243820 | OPTICAL SEMICONDUCTOR DEVICE - An optical demultiplexer has first and second input ports and first and second output ports. When optical signal is introduced into the first input port, intensity of optical signal output from the first output port is equal to that from the second output port. When optical signal is introduced into the second input port, intensity of optical signal output from the first output port is larger than that from the second output port. An optical multiplexer has third and fourth input ports and third and fourth output ports. A first optical waveguide connects between the first output port and the third input port, while a second optical waveguide connects between the second output port and the fourth input port. Voltages applied to a first modulation electrode and a second modulation electrode work to cause changes in the optical path lengths of the first optical waveguide and the second optical waveguide. | 09-27-2012 |
20120251031 | Optical Counter-Phase System And Method Of RF Interference Cancellation - A system and method for cancellation of RF interference in the optical domain. The system and method utilize two Mach-Zehnder electrooptic modulators biased for parallel counter-phase modulation. The method of signal subtraction is referred to as incoherent optical subtraction, since two independent laser sources serve as the optical carrier waves. The system has produced the broadband cancellation result while simultaneously recovering a 50 dBm signal which was initially “buried” under the broadband interference. The cancellation depths achieved by the system are due to the accurate channel tracking and precise time delays attainable with modern optical devices—unattainable with state-of-the-art electronic devices at the time of this writing. | 10-04-2012 |
20120251032 | OPTICAL MODULATOR MODULE AND METHOD FOR MODULATING OPTICAL SIGNAL - The present invention provides a compact, broad-band, and low-drive-voltage optical modulator module capable of generating any multilevel optical modulation. The optical modulator module according to an exemplary aspect of the present invention includes a digital segmented electrode structure optical modulator and m individual driving circuits. The digital segmented electrode structure optical modulator includes semiconductor optical waveguides and at least m waveguide-type optical phase modulator regions. An i-th individual driving circuit includes a driving circuit and a phase shift circuit. The driving circuit amplifies a digital input signal in synchronization with a clock signal and outputs the signal to an i-th waveguide-type optical phase modulator region. The phase shift circuit applies a delay to a signal branched from the clock signal. A j-th individual driving circuit receives an output signal from the phase shift circuit of a (j−1)-th individual driving circuit as a clock signal. | 10-04-2012 |
20120257850 | ELECTRO-OPTICAL MODULATOR - A downsized, low-power electro-optical modulator that achieves reducing both of the additional resistance in the modulation portion and the optical loss each caused by electrodes at the same time is provided. The electro-optical modulator includes a rib waveguide formed by stacking a second semiconductor layer | 10-11-2012 |
20120269478 | LIQUID CRYSTAL WAVEGUIDE FOR DYNAMICALLY CONTROLLING POLARIZED LIGHT - Waveguide and associated methods for controlling an optical phase delay (OPD) of TE polarized light traveling along a propagation direction through a waveguide are disclosed. In one example, the method includes providing the waveguide with a core, at least one cladding; initially aligning at least a portion of the liquid crystal molecules in an initial orientation with their longitudinal axes oriented at an out-of-plane tilt angle, and their longitudinal axis oriented at an in-plane angle; providing the waveguide with a pair of electrodes for receiving a control signal; and applying the control signal to the pair of electrodes to rotate the liquid crystal molecules from the initial orientation, thereby controlling the optical phase delay of the TE polarized light traveling through the waveguide. | 10-25-2012 |
20120321241 | INTERFEROMETER-BASED OPTICAL SWITCHING - Systems and methods according to these exemplary embodiments provide for optical interconnection using optical splitters and interferometer-based optical switching. Optical signals can be routed from an input port to one or more output ports via at least one splitter and at least one interferometer, e.g., a Mach Zehnder interferometer. According to one exemplary embodiment, signal degradation associated with signal splitting is mitigated by using a binary tree of splitters and interferometers between input ports and output ports. | 12-20-2012 |
20120328227 | OPTICAL DEVICE AND OPTICAL MODULATION APPARATUS - Provided is an optical modulator that modulates input light with a high frequency and low half-wave voltage. An optical device comprises a substrate; a dielectric film that is formed on the substrate and includes a first optical waveguide and a second optical waveguide that run parallel to each other; an insulating film formed on the dielectric film; a coplanar line that is formed on the insulating film and includes a signal line arranged between the first optical waveguide and the second optical waveguide, a first ground line arranged in a first region, and a second ground line arranged in a second region; and auxiliary electrodes that are arranged in the first region and the second region, are formed in contact with the dielectric film or within the insulating film, and apply bias voltages to the first optical waveguide and the second optical waveguide. | 12-27-2012 |
20120328228 | OPTICAL DEVICE AND OPTICAL MODULATION APPARATUS - To achieve high-speed optical modulation using a crystal having a complicated refractive index characteristic with respect to applied electric field, provided is an optical device comprising a substrate; a dielectric film that is formed on the substrate and includes a first optical waveguide and a second optical waveguide that run parallel to each other; a transmission line that is formed on the dielectric film and includes a signal line arranged between the first optical waveguide and the second optical waveguide, a first bias electrode, and a second bias electrode, the first bias electrode and the second bias electrode arranged respectively in a first region that is on a side of the first optical waveguide opposite the second optical waveguide and a second region on a side of the second optical waveguide opposite the first optical waveguide; and a drive circuit section that respectively applies a first bias voltage and a second bias voltage differing from each other to the first bias electrode and the second bias electrode, and applies a control voltage that is between the first bias voltage and the second bias voltage to the signal line. | 12-27-2012 |
20130011093 | OPTICAL MODULATOR - Disclosed is an optical modulator which substantially lowers loss and has little attenuation in the intensity of an optical signal after modulation. The optical modulator includes a 1×2 RZ pulse carver wherein optical phase shifters used for modulation are arranged along two arm waveguides held between a 1×2 coupler and a 2×2 coupler, two interferometric modulators connected respectively to two output ports of the 2×2 coupler, and a 2×1 coupler for combining the outputs of the interferometric modulators. | 01-10-2013 |
20130016939 | OPTICAL DEVICEAANM TAKAGI; KazuhisaAACI TokyoAACO JPAAGP TAKAGI; Kazuhisa Tokyo JP - An optical device includes: a substrate; an optical branching filter on the substrate and dividing input light into first and second input lights; first and second Mach-Zehnder optical modulators on the substrate and respectively modulating the first and second input lights; and an optical coupler on the substrate and combining light modulated by the first Mach-Zehnder optical modulator and light modulated by the second Mach-Zehnder optical modulator. Each of the first and second Mach-Zehnder optical modulator includes two optical waveguides, a phase modulation electrode applying a modulation voltage across the optical waveguides to change phases of light in the optical waveguides, and a feed line and a terminal line respectively connected to opposite ends of the phase modulation electrode to supply the modulation voltage to the phase modulation electrode. The feed lines and the terminal lines respectively extend to peripheral portions of the substrate. | 01-17-2013 |
20130022306 | GAIN CONTROL FOR AN OPTICAL MODULATOR - There is described an optical modulation system for transmitting modulated optical light. The system comprises an electro-optic modulator having at least two arms through which light is transmitted and an imbalance electrode located on at least one arm. A current source is configured to inject current into the imbalance electrode for modifying the phase of light passing through the arm. A dither generator is configured to modulate the injected current, or bias voltage applied to at least one of the arms, with a dither signal. A phase sensitive detector is configured to detect an error in the phase of light emitted by the modulator. An operating point controller is configured to monitor the detected phase error and adjust the current injected into the imbalance arm so as to compensate for the detected error and thereby control an operating point of the modulator. | 01-24-2013 |
20130039612 | OPTICAL MODULATOR - An optical modulator comprises a substrate having an electro-optical effect, an optical waveguide formed in the substrate, a buffer layer provided above the optical waveguide, a semiconductor film provided above the buffer layer and having an aperture at a top of the optical waveguide, and an electrode provided above the buffer layer and electrically coupled to the semiconductor film. | 02-14-2013 |
20130044974 | ENDLESS PHASE SHIFTING - Endless phase shifting apparatus, structures, and methods useful—for example—in MIMO optical demultiplexing | 02-21-2013 |
20130044975 | SYSTEM AND METHOD FOR GENERATING A SYNCHRONISATION CONTROL SIGNAL - A system for generating a synchronization control signal for synchronizing a radio-frequency signal having a frequency and a pulsed optical signal, the system comprising an electro-optical amplitude modulator that includes a phase shift controller having a controller output at which the synchronization control signal is output, a phase shift mixer that includes a first and a second photodetector, an optical input connection that connects the input for the optical signal to the optical input of the electro-optical amplitude modulator, and an input splitter that is arranged in the input connection in order to output the optical signal additionally at a branch of the input splitter. | 02-21-2013 |
20130051723 | OPTICAL FREQUENCY COMB GENERATING DEVICE AND OPTICAL PULSE GENERATING DEVICE USING SAME, AND OPTICAL FREQUENCY COMB GENERATING METHOD AND OPTICAL PULSE GENERATING METHOD USING SAME - The optical frequency comb generating device having two optical modulation parts 41 and 42 independently modulating optical waves propagating in two branch waveguides and a phase regulator | 02-28-2013 |
20130071059 | LIGHT CONTROL ELEMENT - Provided is a light control element wherein stable operation at low driving voltage is possible. A light control element comprises a substrate ( | 03-21-2013 |
20130094797 | Optical Transmitter With Tunable Chirp - An optical transmitter with chirp control includes an input polarizer having an input that receives an optical signal. The input polarizer polarizes the optical signal along an input polarization axis. A Mach-Zehnder modulator includes an optical input that is coupled to an output of the input polarizer and an electrical input that receives a modulation signal. The Mach-Zehnder modulator modulates the optical signal with the modulation signal. The input polarization axis of the input polarizer is chosen to achieve a desired chirp of the modulated optical signal. An output polarizer is coupled to the output of the Mach-Zehnder modulator. The output polarizer polarizes the modulated optical signal along a desired output polarization axis that combines TE and TM mode polarizations. | 04-18-2013 |
20130108204 | OPTICAL MODULATION DEVICE, DRIVING METHOD OF OPTICAL MODULATION DEVICE, AND MANUFACTURING METHOD OF OPTICAL MODULATION DEVICE | 05-02-2013 |
20130136388 | OPTICAL MODULATION APPARATUS, METHOD FOR CONTROLLING OPTICAL MODULATION APPARATUS - An optical modulation apparatus, including: a Mach-Zehnder optical modulator having two light waveguides, two output light waveguides, and a join-and-branch portion located therebetween; a drive circuit configured to output a modulation signal to modulation electrodes provided respectively on the two light waveguides as a differential signal, the modulation signal modulating lights propagated in the two light waveguides; a phase adjustment circuit configured to control first phase control signals to be output to phase adjustment electrodes provided respectively on the two light waveguides, and adjust phases of lights propagated in the two light waveguides; a phase shift control circuit configured to switch second phase control signals to be output to phase shift electrodes provided respectively on the two light waveguides, and change phases of the lights propagated in the two light waveguides; and a signal polarity reversal circuit configured to reverse a polarity of the differential signal. | 05-30-2013 |
20130142472 | OPTICAL TRANSMITTER AND OPTICAL TRANSMISSION METHOD - An optical transmitter includes a first Mach-Zehnder, second Mach-Zehnders, a plurality of electrodes and a shift circuit. The first Mach-Zehnder is formed in an LN substrate. The second Mach-Zehnders are formed in branch waveguides of the first Mach-Zehnder. The plurality of electrodes are set in the second Mach-Zehnders and modulate lights input in the second Mach-Zehnders using an electric potential of the electrodes. The shift circuit causes a phase difference between the lights modulated in the above plurality of electrodes and output from the second Mach-Zehnders. The Mach-Zehnder synthesizes the above lights of different phases and generates an output signal. | 06-06-2013 |
20130142473 | OPTICAL DEVICE, OPTICAL DEFLECTION DEVICE, AND OPTICAL MODULATION DEVICE - An optical device includes a phase modulation element having an optical waveguide part and electrodes, the optical waveguide part being configured such that a laser light beam emitted by a laser light source is inputted to the optical waveguide part and having an optical waveguide layer formed of an electro-optic material, the electrodes being provided on respective sides of the optical waveguide part to apply a voltage to the optical waveguide layer, the phase modulation element being configured to modulate a phase of the laser light beam by using a refraction index modulation region formed in the optical waveguide layer when a voltage is applied to the optical waveguide layer through the electrodes, and a pump light source configured to irradiate at least the refraction index modulation region of the optical waveguide layer with a pump light beam. | 06-06-2013 |
20130148920 | OPTICAL PHASE MODULATOR - An optical phase modulator having a reduced time drift of an electro-optical response is disclosed. An optical waveguide exhibiting the electro-optic effect includes two serially coupled portions having opposite time drifts of magnitudes of their respective electro-optical responses. As a result, a time drift of an overall electro-optical response of the optical phase modulator is lessened. | 06-13-2013 |
20130148921 | Electro-optical phase modulator - The invention relates to an electro-optical phase modulator with a plurality of elements arranged between two substrates, which are produced from an optically isotropic material which becomes optically anisotropic when an electrical field is applied, wherein for each of the elements respectively one electrode is arranged on both substrates and the electrodes can be individually controlled at least on one of the substrates. | 06-13-2013 |
20130163913 | ELECTRICAL WAVEGUIDE TRANSMISSION DEVICE FOR USE WITH A MACH-ZEHNDER OPTICAL MODULATOR - An electrical waveguide transmission device accepts a differential electrical input signal (e.g., S+ and S−) propagating along two separate signal conductors with grounded electrical return paths, and outputs the differential input signal to a series push-pull traveling wave electrode Mach-Zehnder optical modulator over a pair of output conductors that act as a return path for each other and provide a desired characteristic impedance matching that of the Mach-Zehnder optical modulator. | 06-27-2013 |
20130170781 | Y-BRANCH DUAL OPTICAL PHASE MODULATOR - The invention relates to Y-branch waveguide dual optical phase modulators with improved electro-optic (EO) frequency and step responses at frequencies below 1 Hz for use in low-frequency applications such fiber-optic gyroscopes. A Y-branch waveguide structure is formed in an EO substrate, with three or more electrodes used to form a waveguide phase modulator in each of two output waveguide arms. In one embodiment an insulating buffer layer is provided between at least a portion of the electrodes and the substrate for flattening the low-frequency EO response by reducing the modulation efficiency below 1 Hz. In one embodiment each of the waveguide phase modulators includes two ground electrodes extending along both sides of a signal electrode. A top portion of the substrate may be doped to reduce lateral variations of the substrate conductivity in the waveguide and non-waveguide portions thereof between corresponding signal and ground electrodes. | 07-04-2013 |
20130170782 | MACH-ZEHNDER INTERFEROMETER HAVING BENDED WAVEGUIDES - Consistent with the present disclosure, both arms of an MZ interferometer are “double-folded” and are bent in at least two locations to define first and second acute inner angles. Accordingly, the arms of the MZ interferometer may have substantially the same length, and, further, the MZ interferometer has a more compact geometry. In one example, the arms parallel each other and have a serpentine shape, and, in a further embodiment, the arms parallel one another and have a Z-shape. Accordingly, since the temperature of a PIC upon which the MZ interferometer is provided does not vary significantly over such short distances, the temperatures of both arms is substantially the same. | 07-04-2013 |
20130170783 | MACH-ZEHNDER HAVING SEGMENTED DRIVE SIGNAL ELECTRODES - Consistent with the present disclosure, MZ drive signal electrodes may be provided relatively close to and parallel to one another, such that the underlying waveguide arms may also be provided close to and parallel to one another. As a result, common mode performance of an MZ modulator may be obtained. In one example, an electrode wiring configuration consistent with the present disclosure may permit a waveguide arm separation of 40 microns or less. | 07-04-2013 |
20130170784 | SEMICONDUCTOR DEVICES AND METHODS OF MANUFACTURING THE SAME - A semiconductor device includes a single crystalline substrate, an electrical element and an optical element. The electrical element is disposed on the single crystalline substrate. The electrical element includes a gate electrode extending in a crystal orientation <110> and source and drain regions adjacent to the gate electrode. The source region and the drain region are arranged in a direction substantially perpendicular to a direction in which the gate electrode extends. The optical element is disposed on the single crystalline substrate. The optical element includes an optical waveguide extending in a crystal orientation <010>. | 07-04-2013 |
20130182992 | METHOD TO DRIVE SEMICONDUCTOR MACH-ZEHNDER MODULATOR - A Mach-Zehnder (MZ) modulator made of semiconductor material and a method to drive the MZ-modulator are disclosed. The MZ-modulator includes a pair of arms to vary the phase of the optical beam propagating therein. One of the arms further provides the phase presetter that varies the phase of the optical beam by π. The arms are driven by modulation signals complementary to each other but with the DC bias equal to each other. | 07-18-2013 |
20130195394 | OPTICAL MODULATOR - The optical modulator includes optical modulation units. The plurality of optical modulation units is disposed in parallel on the same substrate. One input waveguide branches off to be connected to the Mach-Zehnder type optical waveguide of each optical modulation unit, and an entire optical waveguide is formed such that outputs from the Mach-Zehnder type optical waveguides are combined and output through one output waveguide. A modulation signal with the same intensity is applied to a modulation electrode of each optical modulation unit. In at least some of the optical modulation units, mechanical structures including the modulation electrodes of the optical modulation units are configured such that an amplitude value of an optical output modulated by the modulation signal of the optical modulation unit is ½ | 08-01-2013 |
20130202244 | Electrooptical Digital Waveguide Modulator - A digital integrated optical modulator, in particular for a fiber optical signal transmission or measuring device, having two waveguide arms and electrodes that are arranged along both waveguide arms in or on an optical substrate, wherein the arrangements of the electrodes along the two waveguide arms are different from each other. | 08-08-2013 |
20130209022 | INTEGRATED BROADBAND OPTICAL ISOLATOR - An integrated broadband optical isolator that operates over a wide bandwidth, wherein the optical isolator comprises sinusoidally driven phase modulators inside an interferometer. In one exemplary embodiment the optical isolator comprises: a 1×N input optical coupler, where N>2; a N×1 output optical coupler; N optical waveguides optically connecting the 1×N input optical coupler to the N×1 output optical coupler, each one of the N optical waveguides including two phase modulators, wherein each of the phase modulators are driven at a frequency f and wherein the time it takes an optical signal to travel from the center of one phase modulator in a particular waveguide to the center of the other phase modulator in that particular waveguide is substantially equal to ¼f. | 08-15-2013 |
20130209023 | MACH-ZEHNDER OPTICAL MODULATOR USING A BALANCED COPLANAR STRIPLINE WITH LATERAL GROUND PLANES - A Mach-Zehnder optical modulator with a series push-pull traveling wave electrode uses a balanced coplanar stripline with lateral ground planes. Two signal electrodes extend along the center of the optical modulator adjacent and parallel to the optical waveguides in a series push-pull configuration. The ground planes run parallel to the signal electrodes, but are spaced laterally outward from the signal electrodes. | 08-15-2013 |
20130230269 | OPTICAL MODULE, MANUFACTURING METHOD THEREOF, AND OPTICAL TRANSMITTER - An optical module including a first optical coupler; a second optical coupler; a first optical waveguide; a second optical waveguide; a first electrode provided on the first optical waveguide; a second electrode provided on the second optical waveguide; a short electrode shorter than the first and second electrodes and provided on the second optical waveguide; and a first high-frequency connector and a second high-frequency connector; wherein, the short electrode provided on the second optical waveguide is coupled to the second high-frequency connector; and the first electrode provided on the first optical waveguide is coupled to the first high-frequency connector. | 09-05-2013 |
20130243365 | OPTICAL SWITCHING APPARATUS AND METHOD - An optical switching apparatus includes an optical switch element which includes an input port and an output port, and to which a switch control signal is supplied to modulate and output signal light which enters the input port depending on a level of the switch control signal; and an optical gate element which is connected to the output port of the optical switch element and to which a gate control signal is supplied to switch an output of the signal light depending on a level of the gate control signal, wherein the optical switch element varies intensity of the signal light which is output from the output port depending on the switch control signal controlled based on magnitude of a light intensity signal of the optical gate element. | 09-19-2013 |
20130251302 | FLEXIBLE OPTICAL MODULATOR FOR ADVANCED MODULATION FORMATS - An apparatus comprising a cascaded set of deinterleavers. A first optical deinterleaver is configured to receive a first optical signal and a second optical signal. A second optical deinterleaver is configured to receive the second optical signal and a first optical output of the first optical deinterleaver. A third optical deinterleaver is configured to receive a second optical output of the first optical deinterleaver. The apparatus comprises an optical power splitter configured to provide the second optical signal received by the first optical deinterleaver and by the second optical deinterleaver. | 09-26-2013 |
20130251303 | OPTICAL DEVICE HAVING OPTICAL MODULATORS - An optical device includes first and second optical modulators formed on a substrate having electro-optical effect. The first optical modulator includes a first optical waveguide; a first signal electrode configured to provide a first data signal for the first optical waveguide; and a first DC electrode, arranged at an output side of the first signal electrode, and configured to provide first DC voltage for the first optical waveguide. The second optical modulator includes a second optical waveguide; a second signal electrode configured to provide a second data signal for the second optical waveguide; and a second DC electrode provided, arranged at an input side of the second signal electrode, and configured to provide second DC voltage for the second optical waveguide. Input portions of the first and second signal electrodes are arranged at a same side edge of the substrate. | 09-26-2013 |
20130272644 | Multi-Mode Interference Manipulator - A multi-mode interference includes a core portion suitable, at any point, for propagating an optical signal having multiple spatial modes. The core portion includes a shifting section for shifting phases of the spatial modes of the optical signal. | 10-17-2013 |
20130287332 | LOW POWER ELECTRO-OPTIC MODULATOR - An electro-optic modulator includes a substrate comprising a first surface, a pair of transmission lines formed in the first surface and extending substantially in parallel with each other, and a pair of electrodes formed on the first surface and covering the respective transmission lines. | 10-31-2013 |
20130301975 | HYBRID OPTICAL MODULATOR - An optical modulator includes an input port, a first waveguide region comprising silicon and optically coupled to the input port, and a waveguide splitter optically coupled to the first waveguide region and having a first output and a second output. The optical modulator also includes a first phase adjustment section optically coupled to the first output and comprising a first III-V diode and a second phase adjustment section optically coupled to the second output and comprising a second III-V diode. The optical modulator further includes a waveguide coupler optically coupled to the first phase adjustment section and the second phase adjustment section, a second waveguide region comprising silicon and optically coupled to the waveguide coupler, and an output port optically coupled to the second waveguide region. | 11-14-2013 |
20130308893 | INTEGRATED DRIVER AND RELATED METHOD - A driver circuit may include a first node (VA), and a first circuit to generate on the first node (VA) an inverted replica of an input signal (VIN) during driver switching between a first supply voltage (Vdd | 11-21-2013 |
20130315524 | OPTICAL FREQUENCY SHIFTER AND OPTICAL MODULATOR USING THE SAME - An object of the present invention is to provide a temperature-independent optical frequency shifter for generating sub-carriers with a miniaturizable configuration, as well as to provide an all-optical OFDM modulator using the same that is compact, has low temperature dependence, and is even compatible with different frequency grids. Provided is an optical frequency shifter and an optical modulator using the same, the optical frequency shifter comprises one input optical port, a 1-input, 2-output optical coupler optically connected thereto, two Mach-Zehnder modulation units individually optically connected to the two outputs thereof, a 2-input, 2-output optical coupler optically connected to the individual outputs thereof, and two output optical ports optically connected to the outputs thereof, wherein the two Mach-Zehnder modulation units are driven by periodic waveforms at the same frequency whose phases differ from each other by (2p+1) π/2 (p: integer). | 11-28-2013 |
20130322807 | Integrated Light Source Independent Linewidth Reduction - An integrated optical linewidth reduction system detects/estimates the phase noise of an incoming optical signal and subtracts the detected phase noise from the phase noise of the incoming signal. A first coupler/splitter of the linewidth reduction system may split the incoming signal into first and second optical signals travelling through first and second optical paths. A second coupler/splitter may split the second optical signal into third and fourth optical signals travelling through third and fourth optical paths. The third optical path has a longer propagation delay than the fourth optical path. Two different coupling ratios of the third and fourth optical signals are used to generate an electrical signal representative of the phase noise of the incoming signal. A phase detector/estimator estimates the phase noise from the electrical signal. A phase modulator subtracts the detected/estimated phase noise from the phase noise of the incoming signal. | 12-05-2013 |
20130322808 | SEMICONDUCTOR MACH-ZEHNDER MODULATOR AND METHOD FOR MANUFACTURING SEMICONDUCTOR MACH-ZEHNDER MODULATORS - A semiconductor Mach-Zehnder modulator includes a substrate having a main surface including first, second and third regions sequentially arranged along a direction; a waveguide mesa including first and second waveguide arms provided on the second region, first and second optical couplers provided on the first and third regions, respectively; a first semiconductor protective layer provided on side surfaces of the first and second waveguide arms; a buried layer provided on side surfaces of the waveguide mesa and on the main surface, the buried layer including a material having a dielectric constant lower than that of the first protective layer; and first and second upper electrodes provided on the first and second waveguide arms, respectively. The first and second optical couplers are connected to the first and second waveguide arms. Above the second region, the buried layer is provided on the first protective layer. | 12-05-2013 |
20130322809 | OPTICAL MODULATOR - An optical modulator that supports a plurality of modulation formats is provided. The optical modulator includes: a distribution part including an optical demultiplexing/variable-branching switchable circuit; an optical modulator array; and an aggregation part including a combining ratio variable combining circuit and/or an optical multiplexing/variable-combining switchable circuit. The distribution part forms any or a combination of a variable 1×M demultiplexer/brancher, a combination of one or more fixed ILFs and an optical switch and a combination of a plurality of variable optical couplers and an optical switch; the optical modulator array includes a plurality of optical modulators; the aggregation part includes a structure of any or a combination of one or more variable optical couplers, a combination of a plurality of variable attenuators, an M×1 variable coupler, a variable M×1 demultiplexer/brancher and a combination of one or more fixed ILFs and an optical switch. | 12-05-2013 |
20130343693 | ALTERNATING TRAVELING-WAVE MACH-ZEHNDER MODULATOR - Disclosed herein is a traveling-wave Mach-Zehnder modulator and method of operating same that advantageously exhibits a reduced optical insertion loss as compared with contemporary Mach-Zehnder structures. Such advantage comes at the modest expense of increased modulator length and increased RF loss. | 12-26-2013 |
20130343694 | OPTICAL GATE SWITCH - An object of the present invention is to realize an optical gate switch of a monolithic integration type which can avoid problems of losses caused by light coupling of a phase modulation unit to a interferometer optical circuit unit, and can be minimized by integration. The optical gate switch according to the present invention includes an optical waveguide wafer in which a quantum well having a phase modulation effect which is generated by an intersubband transition is set as a core layer; a Michelson interferometer formed on the optical waveguide wafer; and a variable light intensity attenuation unit adjusting a light balance of an interferometer in one of reflection side arms of the Michelson interferometer reflection. | 12-26-2013 |
20140003761 | ADVANCED MODULATION FORMATS USING OPTICAL MODULATORS | 01-02-2014 |
20140023309 | PARALLEL-COUPLED DUAL RACETRACK SILICON MICRO-RESONATOR - An apparatus, resonator and method for modulating light including a mechanism to compensate for parameter deviations. The apparatus may be capable of phase shift keying and quadrature amplitude modulation, and includes a waveguide, a plurality of micro-resonators, and an electronic structure. The plurality of micro-resonators are positioned adjacent to the waveguide and have a parameter deviation in at least one resonator characteristic. The electronic structure is electrically biased so as to cause electro-optic modulation of amplitude and a phase of the light output by the apparatus, each bias voltage comprising a numerical offset that is determined based upon the parameter deviation, thereby reducing any overall effect caused by the material or manufacturing imperfections. An electronic encoder may provide driving voltage levels for phase shift keying or quadrature amplitude modulation. The number of output amplitude and phase states of light depends on the number of output voltage levels of the encoder. | 01-23-2014 |
20140023310 | OPTICAL MODULATOR - An optical modulator is provided which can compensate for a bias shift between an output light and a monitoring light of the optical modulator and which has a configuration capable of being reduced in size with a simple structure. The optical modulator comprises a substrate that has an electro-optical effect, an optical waveguide that includes a Mach-Zehnder type optical waveguide formed in the substrate, a modulation electrode that modulates light waves propagating in the optical waveguide, an optical fiber that guides an output light from the optical waveguide, light collecting means for collecting two radiated lights from the Mach-Zehnder type optical waveguide toward a single optical receiving element, and light intensity ratio adjusting means for adjusting a light intensity ratio of the two radiated lights received by the optical receiving element. | 01-23-2014 |
20140064654 | MULTIMODE FIBER FOR SPATIAL SCANNING - A method for imaging a scan region by controlling at least one of the relative phase and relative amplitude of multiple optical modes propagating through a multimode optical fiber to control the position of an output beam emitted from the output facet of the optical fiber is disclosed. | 03-06-2014 |
20140079351 | MILLIMETER-WAVE ELECTRO-OPTIC MODULATOR - A lithium niobate-based electro-optic modulator may include a ridged optical waveguide structure and/or a thinned substrate. | 03-20-2014 |
20140086522 | OPTICAL WAVEGUIDE SPLITTER - An optical waveguide splitter with a symmetric splitting power ratio having one input port and two output ports, includes a substrate and one or more vertical waveguide layers deposited thereon or diffused thereinto, and optionally one or more cladding layers deposited upon the waveguide layer(s). The waveguide layers and optionally one or more cladding layer together and optionally with the substrate form a profile of the refractive index that supports the propagation of light in a plane substantially parallel to the substrate. On both sides of the input port, the waveguide sidewalls terminate at a depth deeper than the location of the peak intensity of the beam transporting propagating light energy within the input port, and the sidewalls on both sides of each output port terminate at a depth shallower than the location of the peak intensity of the beam transporting the majority light energy within each output port. | 03-27-2014 |
20140086523 | POLING STRUCTURES AND METHODS FOR PHOTONIC DEVICES EMPLOYING ELECTRO-OPTICAL POLYMERS - EOP-based photonic devices employing coplanar electrodes and in-plane poled chromophores and methods of their manufacture. In an individual EOP-based photonic device, enhanced performance is achieved through in-plane poled chromophores having opposing polarities, enabling, for example, a push-pull optical modulator with reduced operational voltage and switching power relative to a conventional MZ modulator. For a plurality of EOP-based photonic devices, enhanced manufacturability is achieved through a sacrificial interconnect enabling concurrent in-plane poling of many EOP regions disposed on a substrate. | 03-27-2014 |
20140086524 | OPTICAL MODULATOR - An optical modulator that includes a substrate | 03-27-2014 |
20140093202 | OPTICAL MODULATOR - An optical modulator comprises a substrate | 04-03-2014 |
20140099053 | OPTICAL WAVEGUIDE DEVICE, OPTICAL INTERFEROMETER AND CONTROL METHOD FOR OPTICAL WAVEGUIDE DEVICE - In order to independently perform control of a phase difference and a loss of light transmitting through an optical waveguide in a simple and easy configuration, an optical waveguide device includes an optical waveguide provided with two electrodes each supplied with a corresponding one of two signals; and a control unit for controlling the two signals so as to cause a phase variation and a loss variation which are caused in light transmitting through the optical waveguide by the two signals to each have a predetermined value. | 04-10-2014 |
20140112611 | ROBUST MODULATOR CIRCUITS USING LATERAL DOPING JUNCTIONS - Disclosed herein are methods, structures, and devices that compensates for modulator loss and modulation inefficiencies introduced by mask misalignments in opposite oriented pn type junction modulators. More specifically, Mach-Zehnder type optical modulators are disclosed wherein both arms in the MZI modulator are arranged in a push-pull configuration and configured to experience pn type junctions of two orientations wherein both arms further configured to experience the same length of waveguide with a pn type junction of each orientation. | 04-24-2014 |
20140126855 | Polarization Control Device - A polarization control device includes a MMI device having primary-side and secondary-side end-faces; a first phase shifter optically coupled to a first port in the primary-side end-face; a first optical waveguide optically coupled via the first phase shifter to the first port in the primary-side end-face; a second optical waveguide optically coupled to a second port in the primary-side end-face; and a tapered waveguide optically coupled to a first port in the secondary-side end-face. The first and second ports in the primary-side end-face are located on first and second axes, respectively. The first port in the secondary-side end-face is located on a third axis located between the first and second axes. The first, second, and third axes extend in a direction from the primary-side end-face to the secondary-side end-face. The tapered waveguide has a width decreasing in a direction from one end to the other end of the tapered waveguide. | 05-08-2014 |
20140126856 | Method and System for Integrated Power Combiners - A method and system for integrated power combiners are disclosed and may include a chip comprising a polarization controller, the polarization controller comprising an input optical waveguide, optical couplers, and a polarization-splitting grating coupler. The chip may be operable to: generate two output signals from a first optical coupler that receives an input signal from said input optical waveguide, phase modulate one or both of the two output signals to configure a phase offset between the two generated output signals before communicating signals with the phase offset to a second optical coupler. One or both optical signals generated by said second optical coupler may be phase modulated to configure a phase offset between signals communicated to the polarization-splitting grating coupler; and an optical signal of a desired polarization may be launched into an optical fiber via the polarization-splitting grating coupler by combining the signals communicated to the polarization-splitting grating coupler. | 05-08-2014 |
20140133794 | Integrated Optical Device And Optical Module - An integrated optical device includes first, second, third, and fourth edge portions; a plurality of modulators each of which includes an optical waveguide and an electrode portion provided on the optical waveguide, the optical waveguide extending in a direction of a first axis; a plurality of electric signal input sections arrayed along the first edge portion extending in a direction of a second axis intersecting with the first axis, each of the electric signal input sections being connected to one of the electrode portions of the modulators; an optical signal input section; and an optical signal output section provided in the second edge portion extending in the direction of the second axis. The modulators are arrayed in the direction of the second axis. In addition, the optical signal input section is provided in one of the second edge portion, the third edge portion, and the fourth edge portion. | 05-15-2014 |
20140140651 | SYSTEMS, METHODS, AND DEVICES FOR OPTOMECHANICALLY INDUCED NON-RECIPROCITY - On-chip non-reciprocity can be achieved by employing micron-sized optomechanical (OM) devices that are fabricated on-chip and which can be integrated with other optical elements. Non-linear coupling between light and a mechanical mode inside a resonator can provide a non-reciprocal response of the OM system, which can be induced and fully controlled by an external driving electromagnetic field. By choosing different resonator and/or waveguide configurations and by tuning different system parameters, the same OM coupling mechanism can be used to provide isolation (e.g., as an optical diode), non-reciprocal phase shifting, and/or routing applications. Even in the presence of a finite intrinsic mode coupling inside the resonator, non-reciprocal effects remain large for a sufficiently strong OM coupling. The disclosed systems, methods, and devices can be applied on a single photon level, which may find use for various non-reciprocal applications in the classical optical as well as the quantum regime. | 05-22-2014 |
20140140652 | Integrated Light Source Independent Linewidth Reduction of Lasers Using Electro-Optical Feedback Techniques - An integrated optical linewidth reduction system includes a phase modulator adapted to modulate the phase of an incoming optical signal in response to a feedback control signal defined by a first electrical signal. The phase modulator is further adapted to generate a first optical signal travelling through a first optical path. The first electrical signal is representative of a phase noise of the first optical signal. An optical linewidth of the first optical signal is less than an optical linewidth of the incoming optical signal. | 05-22-2014 |
20140147073 | ELECTRO-OPTIC MODULATOR - An electro-optic modulator includes a substrate and a Y-shaped waveguide. The substrate has a top surface. The Y-shaped waveguide is formed in the top surface and includes a non-modulated branch and a modulated branch. The substrate defines two grooves in the top surface, separating the non-modulated branch and the modulated branch. | 05-29-2014 |
20140153860 | MACH-ZEHNDER OPTICAL MODULATOR HAVING AN ASYMMETRICALLY-LOADED TRAVELING WAVE ELECTRODE - A Mach-Zehnder optical modulator with a travelling wave electrode has a signal transmission line conductor (S) carrying an input electrical signal, and two ground transmission line conductors (G | 06-05-2014 |
20140169722 | ELECTRO-OPTIC MODULATOR - An electro-optic modulator includes a substrate including a top surface, a Y-shaped waveguide embedded into the top surface and including a first branch dedicated for transmitting transverse electric wave and a second branch dedicated for transmitting transverse magnetic wave, a ground electrode, a first modulating electrode, and a second modulating electrode. The top surface defines a first groove separating the first branch and the second branch, a second groove, and a third groove at a side of the second branch opposite to the first groove. The first modulating electrode and the ground electrode are located two sides of the first branch. The first modulating electrode covers a first sidewall of the second groove adjacent to the first branch. The ground electrode entirely covers the first groove and the second branch. The second modulating electrode covers a bottom surface of the third groove. | 06-19-2014 |
20140169723 | OPTICAL MODULATOR MODULE, INTEGRATED CIRCUIT FOR DRIVING OPTICAL MODULATOR, AND METHOD FOR MODULATING OPTICAL SIGNAL - Waveguide-type optical phase modulator regions of a linear accelerator-type column electrode structure MZ optical modulator are arranged on a semiconductor optical waveguide. A transmission line of an integrated circuit receives a clock signal through a buffer circuit disposed on an input side. Clock terminators are connected between an end of the transmission line and clock terminator power supply electrodes (VCa, VCb). Individual driving circuits receive the clock signal from different positions of the transmission line. An i (1≦i≦m, i is an integer)-th individual driving circuit counted from the input side outputs a signal obtained by amplifying a digital input signal in synchronization with the clock signal to an i-th waveguide-type optical phase modulator region. | 06-19-2014 |
20140185978 | HYBRID INTEGRATION USING FOLDED MACH-ZEHNDER MODULATOR ARRAY BLOCK - An apparatus comprising a modulation block comprising a plurality of modulators, wherein each of the plurality of modulators comprises an optical input port and an optical output port, and wherein all of the optical input ports and all of the optical output ports are positioned on one face of the modulation block. Another apparatus comprising a modulation block comprising one or more Mach-Zehnder modulators (MZMs), wherein each MZM is coupled to an optical input port, an optical output port, and at least one electrical trace, wherein all of the optical input ports and all of the optical output ports are positioned on a first side of the modulation block, and wherein all of the electrical traces are positioned on a second side of the modulation block, and a planar lightwave circuit (PLC) coupled to the modulation block via an optical interface. | 07-03-2014 |
20140199014 | ELECTRO-OPTIC MACH-ZEHNDER MODULATOR AND METHOD FOR FABRICATING AN ELECTRO-OPTIC MACH-ZEHNDER MODULATOR - An electro-optic Mach-Zehnder modulator includes a first optical waveguide forming a first arm of the Mach-Zehnder modulator, and a second optical waveguide forming a second arm thereof. The first or second optical waveguide includes capacitive segments that are spaced apart from one another, each forming an electrical capacitor. A travelling wave electrode arrangement applies a voltage across the first or second optical waveguide. The travelling wave electrode arrangement includes waveguide electrodes arranged on the capacitive segments , an electrical line extending along a part of the first or second optical waveguide, the electrical line being arranged a distance from the waveguide electrodes, and connecting arrangements, each being assigned to one of the waveguide electrodes. Each connecting arrangement includes at least two connecting structures spaced apart from one another wherein the waveguide electrodes each are electrically connected to the electrical line via the assigned two connecting structures. | 07-17-2014 |
20140205229 | Advanced Techniques for Improving High-Efficiency Optical Modulators - Improved optical interferometric modulators have a small waveguide spacing so that the waveguide pair are close to the central electrode, to enhance electro-optic interaction. Asymmetric waveguides with differential indices are used to effectively de-couple the waveguide pair. Multiple sections of asymmetric waveguide pairs with alternating differential indices are used to achieve chirp-free operation. Another version of the device utilizes transmission-line electrode that weave closer to one of the waveguide pair alternately between sections. Another version of the device utilizes waveguide structure that one of the waveguide is closer to the central electrode in alternate section. To improve efficiency further, a DC bias is provided on the outer electrodes configured as an RF-ground but DC-float electrodes. Another improvement is to have a slot is cut underneath the waveguide region to effectively reduce to thickness of the substrate. These improvements lead to higher modulator efficiency. | 07-24-2014 |
20140233878 | OPTICAL ELEMENT AND MACH-ZEHNDER OPTICAL WAVEGUIDE ELEMENT - Provided is an optical element including an optical waveguide including a core formed from: a rib part; and a first and second slab parts sandwiching the rib part. The first slab part includes a P-type region, the second slab part includes an N-type region, the rib part includes a P-type region which is in contact with the P-type region provided in the first slab part, and an N-type region which is in contact with the N-type region provided in the second slab part. The rib part includes a top portion which is located above the first and second slab parts and includes an undoped region formed from at least one of an intrinsic region and a low-concentration doping region which is doped at a dopant concentration 1/10 or less of a dopant concentration in at least one of the adjacent P-type region and the adjacent N-type region. | 08-21-2014 |
20140241657 | OPTICAL MODULATOR WITH AUTOMATIC BIAS CORRECTION - An optical modulator uses an optoelectronic phase comparator configured to provide, in the form of an electrical signal, a measure of a phase difference between two optical waves. The phase comparator includes an optical directional coupler having two coupled channels respectively defining two optical inputs for receiving the two optical waves to be compared. Two photodiodes are configured to respectively receive the optical output powers of the two channels of the directional coupler. An electrical circuit is configured to supply, as a measure of the optical phase shift, an electrical signal proportional to the difference between the electrical signals produced by the two photodiodes. | 08-28-2014 |
20140241658 | Electro-Optic Silicon Modulator With Longitudinally Nonuniform Modulation - A device, such as a silicon modulator, in accordance with the present disclosure employs PN diodes without sacrificing the modulation depth, while achieving lower loss and better impedance matching to 50-Ohm drivers. In one embodiment, the device includes an input waveguide, an input optical splitter coupled to the input waveguide, first and second optical phase shifters coupled to the input optical splitter, an output optical splitter coupled to the first and second phase shifters, and an output waveguide coupled to the output optical splitter. The phase shifters are designed with variant capacitance per unit length. | 08-28-2014 |
20140241659 | OPTICAL MODULATOR MODULE AND SEMICONDUCTOR OPTICAL MODULATOR - A semiconductor optical modulator includes optical input and output portions; a plurality of Mach-Zehnder modulators including first and second waveguide arms having first and second modulation electrodes, respectively; an optical demultiplexer coupled between the optical input portion and the Mach-Zehnder modulator through an optical waveguide; an optical multiplexer coupled between the optical output portion and the Mach-Zehnder modulator; a plurality of electrical inputs including first, second, and common electrodes disposed between the first and second electrodes; and a plurality of differential transmission lines electrically connecting the electrical inputs to the Mach-Zehnder modulators. The Mach-Zehnder modulators, the optical demultiplexer, the optical multiplexer, the electrical inputs, and the differential transmission lines are disposed on a single substrate. In addition, the first and second modulation electrodes, the electrical inputs, and the differential transmission lines have a differential impedance in a range of 80Ω to 95Ω. | 08-28-2014 |
20140254973 | OPTICAL MODULE - An optical modulator includes: laser diodes disposed in parallel with each other, each laser diode having a different lasing wavelength; optical waveguides disposed in parallel with each other with first ends facing the laser diodes; an optical isolator inserted between the laser diodes and the optical waveguides and attenuating return light reflected from the optical waveguides toward the laser diodes; a lens focusing light emitted from the laser diodes onto the optical waveguides through the optical isolator; an optical switch selecting one of the light beams exiting from the optical waveguides; and an optical modulator modulating the light beam selected by and output from the optical switch. | 09-11-2014 |
20140254974 | OPTICAL MODULATOR - A Mach-Zehnder optical modulator includes a join-and-branch portion; two light wave guides connected with the join-and-branch portion; an output light waveguide connected with the join-and-branch portion; arm electrodes respectively provided on the two light waveguides; and a ground electrode that is provided at an edge of at least one of the arm electrodes along the light waveguide, is spaced from the arm electrode and is grounded. | 09-11-2014 |
20140270617 | STABLE LITHIUM NIOBATE WAVEGUIDE DEVICES, AND METHODS OF MAKING AND USING SAME - Embodiments of the present invention provide stable lithium niobate waveguide devices, and methods of making and using the same. A lithium niobate-based waveguide device may include a Z-cut lithium niobate substrate having upper and lower surfaces, an optical waveguide embedded within the lithium niobate substrate, a signal electrode disposed on the upper surface of lithium niobate substrate and parallel to the optical waveguide, guard electrodes disposed on the upper surface of the lithium niobate substrate and flanking but spaced apart from the signal electrode, and a conductive layer on the lower surface of the lithium niobate substrate, wherein the conductive layer serves as a common ground reference for the signal and guard electrodes. | 09-18-2014 |
20140270618 | WAVELENGTH TUNABLE INTEGRATED OPTICAL SUBASSEMBLY BASED ON POLYMER TECHNOLOGY - An optical sub assembly can include a distributed feedback (DFB) tunable laser and an optical modulator. Wavelength selection and phase adjustment portions of the DFB laser, as well as an electro-optic (EO) modulator can be formed from polymer waveguides including hyperpolarizable chromophores disposed on a single substrate. | 09-18-2014 |
20140294337 | OPTICAL IQ MODULATOR - An optical IQ modulator ( | 10-02-2014 |
20140301695 | TUNABLE OPTICAL FREQUENCY COMB GENERATOR - An optical device comprising a tunable optical frequency comb generator. The comb generator includes an interferometer, and an optical feed-back loop waveguide. | 10-09-2014 |
20140307996 | OPTICAL MODULATOR - An optical modulator includes main input and output ports; first and second Mach-Zehnder modulators; a first branching waveguide optically coupling the main input port to the first and second Mach-Zehnder modulators; a first driver circuit connected to the first Mach-Zehnder modulator, the first driver circuit generating a first drive signal having a first amplitude at a first bias point; and a second driver circuit connected to the second Mach-Zehnder modulator, the second driver circuit generating a second drive signal having a second amplitude at a second bias point. The first and second drive signals satisfy at least one of a first condition and a second condition. The first condition is that the first amplitude differs from the second amplitude. The second condition is that the first bias point differs from the second bias point. | 10-16-2014 |
20140314365 | ELECTRO-OPTIC MODULATOR - Electro-optic modulator includes a substrate, a waveguide formed in a top surface of the substrate, a pair of first modulating electrodes and a pair of second modulating electrodes. The waveguide includes a Y-shaped incident member, a Y-shaped output member, first and second connection members. The Y-shaped incident member includes an incident portion, first and second incident branches. The Y-shaped output member includes an output portion, a first and second output branches. The first connection member includes a first non-modulated branch and a first modulated branch. The second connection member includes a second non-modulated branch and a second modulated branch. The first non-modulated branch and the first modulated branch are interconnected between the first incident branch and the first output branch in parallel. The second non-modulated branch and the second modulated branch are interconnected between the second incident branch and the second output branch in parallel. | 10-23-2014 |
20140314366 | OPTICAL MODULATOR - An optical modulator comprises an input optical splitting unit for bifurcating input light; a final optical coupling unit for coupling optical signals in a polarization state orthogonal to each other; an intermediate optical coupling unit provided in an intermediate position between the input optical splitting unit and the final optical coupling unit; first and second optical paths for connecting the input optical splitting unit and the intermediate optical coupling unit, optical path lengths of the first and second optical paths are approximately equal; third and fourth optical paths for connecting the intermediate optical coupling unit and the final optical coupling unit, optical path lengths of third and fourth optical paths are approximately equal; and three binary phase modulation unit arranged one by one in each of the three optical paths of the first, second, third and fourth optical paths. | 10-23-2014 |
20140321790 | ELECTRO-OPTICAL MODULATOR HAVING HIGH EXTINCTION RATIO WHEN FUNCTIONING AS SWITCH - An electro-optic modulator includes a substrate, an end-to-end Y-shaped waveguide for optical divergence and convergence, and electrodes. The waveguide is formed in the substrate and the electrodes are formed in the substrate and received voltages act to modulate first and second sections of the waveguide such that the optical output by the first and second sections are equal or opposite to each other in all necessary respects regarding phase and amplitude. | 10-30-2014 |
20140321791 | ELECTRO-OPTIC MODULATOR HAVING HIGH EXTINCTION RATIO WHEN FUNCTIONING AS SWITCH - An electro-optic modulator includes a substrate, a Y-shaped waveguide, and electrodes. The waveguide is formed in the substrate with diverging and reconverging portions. The electrodes are formed in the substrate to sandwich the diverged portions of the waveguide and receive voltages which modulate each branch of the Y shaped waveguide such that power outputs of branches of the Y shape are precisely synchronized and an improved extinction ratio thus obtained. | 10-30-2014 |
20140321792 | ELECTRO-OPTICAL MODULATOR HAVING HIGH EXTINCTION RATIO WHEN FUNCTIONING AS SWITCH - An electro-optic modulator includes a substrate, an end-to-end Y-shaped waveguide for optical divergence and convergence, and electrodes. The waveguide is formed in the substrate and the electrodes are formed to substantially sandwich the waveguide in the substrate and voltages applied to the electrodes act to modulate first and second sections of the waveguide such that the optical outputs by the first and second sections are equal or opposite to each other in all necessary respects regarding phase and amplitude, and an improved extinction ratio thus obtained. | 10-30-2014 |
20140321793 | ELECTRO-OPTIC MODULATOR - An electro-optic modulator includes a substrate having a polarization inversion region whose polarization is inverted, and a waveguide embedded in the substrate and including a first branch and a second branch. A portion of the first branch is embedded in the polarization inversion region. | 10-30-2014 |
20140321794 | ELECTRO-OPTIC MODULATOR OF LARGE BANDWIDTH - An electro-optic modulator includes a substrate, a waveguide lens, a Y-shaped waveguide, and electrodes. The waveguide lens and the Y-shaped waveguide are formed in the substrate. The Y-shaped waveguide connects the waveguide lens and includes a first section dedicated for transmitting TE mode and a second section dedicated for transmitting TM mode. The electrodes are configured to modulate outputs of the waveguide lens, the first section, and the second section. | 10-30-2014 |
20140321795 | ELECTRO-OPTICAL MODULATOR AND METHOD FOR MAKING THEREOF - A low-voltage optical modulator includes a substrate, a waveguide, a first pair of electrodes, and a second pair of electrodes. The waveguide is diffused into the top surface of the substrate, into a major branch and a parallel modulating branch. A structure of the first and second pair of electrodes are same. The first pair of electrodes includes a first and a second electrode parallel to each other. The first electrode is formed on the modulating branch and the second electrode is opposite to the modulating branch and away from the major branch. The second pair of electrodes includes parallel third and fourth electrodes. The third electrode is formed on the major branch. The fourth electrode is opposite to the major branch and away from the modulating branch. | 10-30-2014 |
20140321796 | WAVELENGTH SELECTIVE SWITCH - A wavelength selective switch includes a light input and output part in which light input/output ports are arranged in a predetermined direction, the light input/output ports including a first port for inputting light, a second port for outputting the light, and at least one third port for inputting or outputting the light, a wavelength dispersive element optically coupled to the light input and output part, and a phase modulation element which includes a plurality of pixels performing phase modulation and diffractively deflects an optical path of the light arriving from the first port via the wavelength dispersive element by presenting a diffraction-grating-shaped phase modulation pattern, and the light input/output ports are arranged so that a 1 | 10-30-2014 |
20140334764 | BROADBAND OPTICAL ISOLATOR USING PHASE MODULATORS AND MACH-ZEHNDER INTERFEROMETERS - Optical devices that do not employ magneto-optics materials or non-linear effects to achieve non-reciprocal light propagation. The optical devices are compatible with the fabrication of monolithic photonic integrated circuits such as silicon-on-insulator planar lightwave circuits. In particular the devices use demonstrated passive (beam-splitters, waveguides) and active (phase modulators) components to achieve non-reciprocal light propagation. The devices can be used as non-reciprocal optical modulators or optical isolators when driven by a periodic radio frequency (RF) electric source. | 11-13-2014 |
20140334765 | ELECTRO-OPTIC MODULATOR - Electro-optic modulator includes a substrate, a waveguide formed in a top surface of the substrate, first modulating electrodes and second modulating electrodes. The waveguide includes a Y-shaped incident member, a Y-shaped output member, and first and second connection members. The Y-shaped incident member includes an incident portion, first and second incident branches. The Y-shaped output member includes an output portion, a first and second output branches. The first connection member includes a first branch and a second branch. The second connection member includes a third branch and a fourth branch. The first branch and the second branch are interconnected between the first incident branch and the first output branch and arranged in parallel. The third branch and the fourth branch are interconnected between the second incident branch and the second output branch and arranged in parallel. | 11-13-2014 |
20140341497 | ULTRA-RESPONSIVE PHASE SHIFTERS FOR DEPLETION MODE SILICON MODULATORS - A novel phase shifter design for carrier depletion based silicon modulators, based on an experimentally validated model, is described. It is believed that the heretofore neglected effect of incomplete ionization will have a significant impact on ultra-responsive phase shifters. A low VπL product of 0.3 V·cm associated with a low propagation loss of 20 dB/cm is expected to be observed. The phase shifter is based on overlapping implantation steps, where the doses and energies are carefully chosen to utilize counter-doping to produce an S-shaped junction. This junction has a particularly attractive VπL figure of merit, while simultaneously achieving attractively low capacitance and optical loss. This improvement will enable significantly smaller Mach-Zehnder modulators to be constructed that nonetheless would have low drive voltages, with substantial decreases in insertion loss. The described fabrication process is of minimal complexity; in particular, no high-resolution lithographic step is required. | 11-20-2014 |
20140341498 | STATIC ELECTRO-OPTICAL PHASE SHIFTER HAVING A DUAL PIN JUNCTION - A semiconductor electro-optical phase shifter may include a first optical action zone having a minimum doping level, a first lateral zone and a central zone flanking the first optical action zone along a first axis, doped respectively at first and second conductivity types so as to form a P-I-N junction between the first lateral zone and the central zone. The phase shifter may include a second optical action zone having a threshold doping level, and a second lateral zone flanking the second optical action zone with the central zone along the first axis doped at the first conductivity type so as to form a P-I-N junction between the second lateral zone and the central zone. | 11-20-2014 |
20140341499 | DUAL STATIC ELECTRO-OPTICAL PHASE SHIFTER HAVING TWO CONTROL TERMINALS - A semiconductor electro-optical phase shifter comprises a central zone (I | 11-20-2014 |
20140348460 | System and Method for an Optical Phase Shifter - In one embodiment, an optical phase shifter includes a first phase-shifter configured to phase shift a transverse electric (TE) component of an optical signal by a first phase-shift to produce a TE component of a first signal, and a transverse magnetic (TM) component of the optical signal by a second phase-shift to produce a TM component of the first signal. The optical phase-shifter includes a polarization-rotator configured to rotate the TE component of the first signal to produce a TM component of a rotated signal, and the TM component of the first signal to produce a TE component of the rotated signal. The optical phase-shifter includes a second phase-shifter configured to phase-shift a TE component of the rotated signal by a third phase-shift, and the TM component of the rotated signal by a fourth phase-shift, where the first phase-shifter, the polarization-rotator, and the second phase-shifter are integrated on a substrate. | 11-27-2014 |
20140355924 | OPTICAL MODULATOR - An optical modulator includes: a substrate that has electrooptical effect and has a Mach-Zehnder modulator that has a 2×2 coupler acting as a splitter, two intermediate waveguides coupled to outputting waveguides of the splitter and another 2×2 coupler acting as a combiner coupled to the two intermediate waveguides; and a suppresser that suppresses a power of an output light from an uncoupled waveguide and an input light into the uncoupled waveguide of at least one of the 2×2 couplers in an extending direction of the Mach-Zehnder modulator. | 12-04-2014 |
20140355925 | POSITIVE COEFFICIENT DYNAMIC ELECTRO-OPTICAL PHASE SHIFTER - A semiconductor electro-optical phase shifter may include an optical action zone configured to be inserted in an optical waveguide, and a bipolar transistor structure configured so that, in operation, collector current of the bipolar transistor structure crosses the optical action zone perpendicular to the axis of the optical waveguide. | 12-04-2014 |
20140355926 | MACH-ZEHNDER MODULATOR ARRANGEMENT AND METHOD FOR OPERATING A MACH-ZEHNDER MODULATOR ARRANGEMENT - An electro-optic Mach-Zehnder modulator arrangement includes first and second optical waveguides forming, respectively, first and second arms of the Mach-Zehnder modulator. An electrode arrangement includes a first waveguide electrode output port coupled to the first waveguide electrodes a second waveguide electrode arranged on top of a capacitive segment of the first and the second optical waveguides, respectively, such that a voltage can be applied across the capacitive segments of the first and second optical waveguide. At least one driver unit supplies a voltage to the electrode arrangement. The driver unit includes first and second output ports coupled, respectively, to the first and second waveguide electrodes. The driver unit supplies first and second varying signals to the first and second waveguide electrodes via the first and second output ports, respectively. A non-grounded conductive region connects the capacitive segments of the first and second optical waveguides to each other. | 12-04-2014 |
20140369637 | ELECTRO-OPTIC MODULATORS - The invention relates to a Mach-Zehnder modulator comprising a first optical waveguide forming a first modulator arm and a second optical waveguide forming a second modulator arm of the Mach-Zehnder modulator, an electrode arrangement comprising a plurality of first waveguide electrodes for applying a voltage across the first optical waveguide and a plurality of second waveguide electrodes for applying a voltage across the second optical waveguide, at least one electrically conductive connecting element generating a short-circuit between at least one of the first waveguide electrodes and at least one of the second waveguide electrodes. The electrode arrangement is a travelling wave electrode arrangement further comprising a first and a second electrical line extending at least partially parallel to the first and second optical waveguide. The first and the second waveguide electrodes are connected to the first and second electrical lines via connecting structures. | 12-18-2014 |
20140369638 | ADVANCED MODULATION FORMAT USING TWO-STATE MODULATORS - A method, comprising modulating digital data onto an optical carrier. Modulating includes intensity splitting the optical carrier in an input optical coupler of an interferometer. The interferometer including two or more controllable optical waveguides located on a substrate, each controllable optical waveguide connecting the input optical coupler to an output optical coupler of the interferometer and having a two-state modulator along a segment thereof. Modulating include optically modulating separate data streams onto each of the optical carriers produced by the splitting. The two or more controllable optical waveguides are connected to transmit an output to the output optical coupler, substantially different light amplitudes and/or phases when the two-state modulators of the two or more controllable optical waveguides are in different states, as driven by the data streams having different information content. The two or more controllable optical waveguides are configured to modulate the light amplitudes and/or phases in a substantially same manner when the two-state modulators are in identical states. | 12-18-2014 |
20140376852 | ELECTRO-OPTICAL PHASE SHIFTER HAVING A LOW ABSORPTION COEFFICIENT - A semiconductor electro-optical phase shifter may include a central zone configured to be placed in an optical waveguide and doped at a first conductivity type, a first lateral zone adjacent a first face of the central region and doped at a second conductivity type, and a second lateral zone adjacent a second face of the central zone and doped at the second conductivity type. | 12-25-2014 |
20140376853 | MACH-ZEHNDER INTERFEROMETER TYPE OPTICAL MODULATOR - A Mach-Zehnder interferometer type optical modulator includes a first end facet and a reflecting portion opposing the first end facet; a single optical coupler including input and output ports, the optical coupler being disposed between the first end facet and the reflecting portion; first and second optical waveguides that are connected to the input ports of the optical coupler; third and fourth optical waveguides that are connected to the output ports of the optical coupler; and a phase shifting section disposed between the optical coupler and the reflecting portion. The phase shifting section includes a first optical waveguide structure constituting part of the third optical waveguide; a first upper electrode on the first optical waveguide structure; a second optical waveguide structure constituting part of the fourth optical waveguide; and a second upper electrode on the second optical waveguide structure. | 12-25-2014 |
20150016767 | OPTICAL SEMICONDUCTOR DEVICE - An optical semiconductor device includes a laser oscillator on a semiconductor substrate; and an optical modulator on the semiconductor substrate. The laser oscillator includes a pair of reflecting mirrors at least one of which is a loop mirror, and the loop mirror includes a loop waveguide and a plurality of first ring resonators serially inserted in the loop waveguide. The optical modulator includes a plurality of second ring resonators connected in cascade along a modulator waveguide. A transmission band width of the first ring resonator is set greater than a transmission band width of the second ring resonator. | 01-15-2015 |
20150023627 | METHOD FOR PRODUCING SEMICONDUCTOR OPTICAL DEVICE AND SEMICONDUCTOR OPTICAL DEVICE - A method for producing a semiconductor optical device includes the steps of forming first and second optical waveguides; forming a first resin layer on the first and the second optical waveguides; forming an opening in the first resin layer; forming a first electrode in the opening; forming a second resin layer on the first electrode and the first resin layer; forming a groove in the second resin layer on the first electrode; forming a second electrode on the second resin layer, a side surface of the groove, and the top surface of the first electrode; and forming a third electrode on the second electrode. The second and third electrodes have a region in which the second and third electrodes pass over the second optical waveguide, and, in the region, the first and second resin layers are disposed between the second electrode and the second optical waveguide. | 01-22-2015 |
20150036964 | LIGHT SOURCE CIRCUIT AND LIGHT SOURCE DEVICE EQUIPPED WITH SAME - A light source circuit transmits light incident from a semiconductor laser source to a plurality of optical devices. At least one optical branch section is formed to branch one input-side optical waveguide at least into a first output-side optical waveguide terminal and a second output-side optical waveguide terminal. A light path length (L1) between the optical branch section and a next-stage optical branch section or the optical device is connected to the first output-side optical waveguide extending from the optical branch section and a light path length (L2) between the optical branch section and the next-stage optical branch section selected such that the absolute value of a difference between (L1) and (L2) is (¼+i/2) times (i is zero or a positive integer) the wavelength of the light transmitted through the light source circuit. | 02-05-2015 |
20150036965 | MACH-ZEHNDER OPTICAL MODULATOR WITH EMBEDDED ACTIVE ELEMENTS - A Mach-Zehnder optical modulator is provide and has a travelling wave electrode extending over two optical waveguide branches and modulating the relative phase of the optical beam components propagating in those branches. The travelling wave electrode has transmission line conductors and pairs of waveguide electrodes, the waveguide electrodes of each pair being coupled to one of the optical waveguide branches, respectively. The travelling wave electrode further includes active devices having a high impedance input electrically connected to one of the transmission line conductors and a low impedance output electrically connected to one of the waveguide electrodes. Each active device transfers the electrical modulation signal from the associated transmission line conductor onto the associated waveguide electrode according to a voltage transfer function. | 02-05-2015 |
20150036966 | TUNABLE RF FILTER DEVICE USING OPTICAL WAVEGUIDES WITH DISPERSION SLOPES OF OPPOSITE SIGNS AND RELATED METHODS - A tunable Radio Frequency (RF) filter device includes a tunable optical source configured to generate an optical carrier signal, and a modulator coupled to the tunable optical source and configured to modulate the optical carrier signal with an RF input signal. The tunable RF filter device may also include first and second optical waveguides coupled to the modulator and having first and second dispersion slopes of opposite sign, and an optical-to-electrical converter coupled to the first and second optical waveguides and configured to generate an RF output signal with a frequency notch therein based upon the tunable optical source. | 02-05-2015 |
20150043864 | OPITCAL PULSE-GENERATOR - Provided is an optical pulse-generator capable of efficiently using by a low driving voltage an entire band of an optical frequency comb input to a chirp compensator for the formation of an optical pulse. According to a graph shown in FIG. | 02-12-2015 |
20150043865 | MACH-ZEHNDER MODULATOR ARRANGEMENT AND METHOD FOR OPERATING A MACH-ZEHNDER MODULATOR ARRANGEMENT - A Mach-Zehnder modulator arrangement includes at least one electro-optic Mach-Zehnder modulator having a first optical waveguide forming a first modulator arm and a second optical waveguide forming a second modulator arm. A travelling wave electrode arrangement includes first waveguide electrodes for applying a voltage across the first optical waveguide and second waveguide electrodes for applying a voltage across the second optical waveguide. The first waveguide electrodes are capacitively coupled to the second waveguide electrodes. A driver unit supplies an alternating voltage to the travelling wave electrode arrangement. The driver unit includes a first output port coupled to the first waveguide electrodes and a second output port coupled to the second waveguide electrodes. The driver unit supplies a first varying signal to the first waveguide electrodes via the first output port and a second varying signal to the second waveguide electrodes via the second output port. | 02-12-2015 |
20150043866 | Electro-Optic Silicon Modulator With Capacitive Loading In Both Slots Of Coplanar Waveguides - Embodiments of the present disclosure provide a high-speed silicon modulator without the microwave mode conversion and provide 50-ohm impedance matching to drivers simultaneously. In one aspect, a device may include an input waveguide region, an optic splitter, two optic phase shifters, an optic splitter, and an output waveguide. The device may include two curved waveguides. Either or both of the curved waveguides may have specially doped regions including PN junctions or MOS capacitors. The PN junctions or MOS capacitors may be alternatively connected to both slots of a coplanar waveguide forming the electrodes. | 02-12-2015 |
20150043867 | SEMICONDUCTOR OPTICAL DEVICE AND METHOD FOR MANUFACTURING SEMICONDUCTOR OPTICAL DEVICE - A method for manufacturing a semiconductor optical device includes the steps of growing a stacked layer including lower and upper core layers, a first upper region including a non-doped layer, a second upper region including a p-type layer, and a cap layer; forming an upper mesa by etching the stacked layer; selectively etching the cap layer in the upper mesa on the first and second regions; forming a mask on the upper mesa in the second and third regions; and etching the upper mesa using the mask so as to form first to fourth mesa portions. The first and fourth mesa portions are formed by etching the first and second upper regions, and the second upper region and the cap layer, respectively. The second and third mesa portions are formed by etching the first and second upper regions, and the second upper region and the cap layer, respectively. | 02-12-2015 |
20150049978 | SILICON-BASED ELECTRO-OPTICAL DEVICE - In a region in which silicon semiconductor layers having first and second conductive types are stacked, a concavoconvex structure including a Si | 02-19-2015 |
20150063742 | METHOD FOR MODULATING A CARRIER LIGHT WAVE - Method for modulating a carrier light wave with symbols, led through a modulating interferometer, the total path phase shift being the sum of a respective first, second, third or fourth static phase shift and a respective first, second, third or fourth variable modulating phase shift amount. For each of at least two symbols:
| 03-05-2015 |
20150063743 | OPTICAL-WAVEGUIDE-ELEMENT MODULE - An object of the present invention is to provide an optical waveguide element module where the bonding wires can be prevented from disengaging or disconnecting so as to provide high reliability. Another object is to provide an optical waveguide element module that can be made compact and where an increase in the manufacturing cost can be minimized. An optical waveguide element module having: a waveguide substrate | 03-05-2015 |
20150063744 | Planar Polarization Rotator - An optical polarization rotator includes first and second optical waveguide ribs located along a planar surface of a substrate. The second optical waveguide rib is located farther from the surface than the first optical waveguide rib. First segments of the optical waveguide ribs form a vertical stack over the substrate, and second segments of the optical waveguide ribs are offset laterally in a direction along the planar surface. The first and second optical waveguide ribs are formed of materials with different bulk refractive indexes. | 03-05-2015 |
20150071582 | OPTICAL MODULATOR AND OPTICAL MODULATION CONTROL METHOD - An optical modulator includes: a modulator including an optical waveguide provided in a semiconductor substrate having an electro-optical effect and an electrode to apply an electric field depending on a bias voltage and a modulation signal to the optical waveguide; a driver circuit to generate a modulation signal in accordance with an input signal; a superimposer to superimpose a reference signal on the bias voltage, the reference signal having lower frequency than the modulation signal; and a controller to control a bias voltage in a direction orthogonal to a modulation direction of the modulator based on the frequency component of the reference signal extracted from a modulated optical signal generated by the modulator. | 03-12-2015 |
20150071583 | OPTICAL MODULATOR AND OPTICAL MODULATION CONTROL METHOD - An optical modulator includes: a modulator including an optical waveguide provided in a semiconductor substrate having an electro-optical effect and an electrode to apply an electric field depending on a bias voltage and a modulation signal to the optical waveguide; a driver circuit to generate a modulation signal in accordance with an input signal; a superimposer to superimpose a reference signal on the bias voltage, the reference signal having lower frequency than the modulation signal; and a controller to control a bias voltage in a direction orthogonal to a modulation direction of the modulator based on the frequency component of the reference signal extracted from a modulated optical signal generated by the modulator. | 03-12-2015 |
20150078702 | System and Method for an Optical Phase Shifter - In one embodiment, an optical phase shifter includes a first waveguide phase shifter and a second waveguide phase shifter. The optical phase shifter also includes a first polarization rotator optically coupled between the first waveguide phase shifter and the second waveguide phase shifter, where the first waveguide phase shifter, second waveguide phase shifter, and first polarization rotator are integrated on a single substrate. | 03-19-2015 |
20150086151 | STABILIZATION OF AN INJECTION LOCKED HARMONICALLY MODE-LOCKED LASER VIA POLARIZATION SPECTROSCOPY FOR FREQUENCY COMB GENERATION - Stabilization of an injection locked optical frequency comb is achieved through polarization spectroscopy of an active laser cavity, eliminating optical PM sidebands inherent in previous stabilization methods. Optical SNR of 35 dB is achieved. A monolithic AlInGaAs quantum well Fabry-Prot laser injection locked to a passively mode-locked monolithic laser is presented here. The FP laser cavity can be used as a true linear interferometric intensity modulator for pulsed light. | 03-26-2015 |
20150093067 | OXIDE CAPACITOR ELECRO-OPTICAL PHASE SHIFTER - An electro-optical phase shifter to be located in an optical waveguide may include a rib of a semiconductor material extending along a length of the optical waveguide and a control structure configured to modify a concentration of carriers in the rib according to a control voltage present between first and second control terminals of the phase shifter. The control structure may include a conductive layer covering a portion of the rib and electrically connected to a first of the control terminals. An insulating layer may be configured to electrically isolate the conductive layer from the rib. | 04-02-2015 |
20150104128 | PLANAR OPTICAL WAVEGUIDE DEVICE AND DP-QPSK MODULATOR - A planar optical waveguide device, includes: two input portions that are waveguides that have the same width, are parallel to each other, and have rectangular cross-sections; a wide portion that is a linear waveguide and is connected after the two input portions; a tapered portion that is connected after the wide portion and that is a multi-mode waveguide which has a tapered shape having a width decreasing gradually and through which at least TE1 propagates; and an output portion that is connected after the tapered portion and that is a multi-mode waveguide which has a rectangular cross-section and through which at least TE1 propagates. The planar optical waveguide device forms a high-order mode conversion combining element that outputs the TE0, which is input to the two input portions, as the TE1 from the output portion. | 04-16-2015 |
20150110438 | TREATMENT AND/OR STABILIZING GASES IN AN OPTICAL GYRO BASED ON AN INORGANIC WAVEGUIDE - A system is provided, the system including at least one integrated optical circuit (IOC) formed from at least one material, and a support-structure configured to support the at least one IOC to couple light between other components. A performance of the at least one IOC is improved by treatment with at least one selected gas. | 04-23-2015 |
20150131936 | METHOD FOR BRIGHTNESS ENHANCEMENT AND MODES MANIPULATION OF A MULTIMODE OPTICAL FIBER - The invention relates to adaptive optics techniques applied to alter the modal structure of light propagating in an optical fiber. In particular the invention relates to altering the modal structure in a multimode beam propagating in a multimode fiber by lowering the number of higher modes. The method comprises combining a wavefront sensor and/or a power sensor with a phase control actuator and actuator control algorithms, to alter the phase structure of the beam thereby to eliminate higher modes. The corrected beam can be then effectively coupled into a smaller diameter fiber with minimum loss of energy and concentrated to smaller spot sizes limited by diffraction. | 05-14-2015 |
20150147018 | OPTICAL MODULATOR - An optical modulator according to the present invention includes an optical branching section having at least one beam splitter and a mirror and configured to branch input light, a lens configured to converge the respective lights branched in the optical branching section, a plurality of phase modulation sections each configured to perform phase modulation of each light which is input thereto through the lens, and an optical combining section configured to combine a plurality of phase-modulated lights which are output from the plurality of phase modulation sections, and output modulated signal light. | 05-28-2015 |
20150293427 | OPTICAL MODULATION DEVICE - An optical modulation device configured of a planar optical waveguide, includes: a light incidence unit which allows light to be incident on the planar optical waveguide; a Mach-Zehnder interferometer which includes a first optical splitter section branching the light incident on the light incidence unit, two arm portions guiding the light branched by the first optical splitter section, a phase modulation unit linearly disposed on each of the two arm portions, and a first optical coupler section combining the light guided from the two arm portions; a light launching unit which launches the light combined by the first optical coupler section from the planar optical waveguide; and a traveling-wave electrode which includes an input unit and an output unit, and applies a voltage to the phase modulation unit. | 10-15-2015 |
20150301362 | INTEGRATED DRIVER AND RELATED METHOD - A driver circuit may include a first node, and a first circuit to generate on the first node an inverted replica of an input signal during driver switching between a first supply voltage and a first reference voltage, the inverted replica having a threshold voltage value based upon a second reference voltage greater than the first supply voltage. The driver circuit may include a cascode stage to be controlled by the second reference voltage and to be coupled between a second supply voltage and the first node, a delay circuit to generate a delayed replica of the input signal, an amplifier, and a switching network to couple the control terminal of the active load transistor to one of the first reference voltage and the first node based upon the input signal. | 10-22-2015 |
20150301363 | MOS Capacitor Optical Modulator with Transparent Conductive and Low-Refractive-Index Gate - A metal-oxide semiconductor (MOS) optical modulator including a doped semiconductor layer having a waveguide structure, a dielectric layer disposed over the waveguide structure of the doped semiconductor layer, a gate region disposed over the dielectric layer, wherein the gate region comprises a transparent electrically conductive material having a refractive index lower than that of silicon, and a metal contact disposed over the gate region. The metal contact, the gate region, and the waveguide structure of the doped semiconductor layer may be vertically aligned with each other. | 10-22-2015 |
20150316793 | METHOD AND SYSTEM FOR A LOW PARASITIC SILICON HIGH-SPEED PHASE MODULATOR - Methods and systems for a low-parasitic silicon high-speed phase modulator are disclosed and may include fabricating an optical phase modulator that comprises a PN junction waveguide formed in a silicon layer, wherein the silicon layer may be on an oxide layer and the oxide layer may be on a silicon substrate. The PN junction waveguide may have p-doped and n-doped regions on opposite sides along a length of the PN junction waveguide, and portions of the p-doped and n-doped regions may be removed. Contacts may be formed on remaining portions of the p-doped and n-doped regions. Portions of the p-doped and n-doped regions may be removed symmetrically about the PN junction waveguide. Portions of the p-doped and n-doped regions may be removed in a staggered fashion along the length of the PN junction waveguide. Etch transition features may be removed along the p-doped and n-doped regions. | 11-05-2015 |
20150316796 | DUAL-TAP ELECTRO-OPTIC MODULATOR AUTO-BIAS CONTROL - A method and apparatus for controlling operation of an electro-optic modulator is disclosed. A first intensity of light is obtained at an input to the electro-optic modulator. A second intensity of light is obtained at an output of the electro-optic modulator. A difference between the obtained first intensity and the obtained second intensity is used to control a biasing of a modulator transfer function of the electro-optic modulator to control the electro-optic modulator. | 11-05-2015 |
20150316829 | DEVICE FOR GENERATING A MODULATION OF AN OPTICAL SIGNAL COMPRISING ELECTRO-ABSORPTION MODULATORS - The invention relates to a device for generating a modulation ( | 11-05-2015 |
20150323819 | ELECTRO-OPTIC MODULATORS - Electro-optic modulators are disclosed. An electro-optic modulator includes an optical ring resonator, an optical waveguide, and a cavity of electro-optic material. The waveguide has a first portion positioned adjacent the resonator to create a first coupling region and a second portion positioned adjacent the resonator to create a second coupling region. The cavity of electro-optic material is embedded within the waveguide between the first portion and the second portion. A method of optical modulation includes the steps of receiving light into an optical waveguide, coupling a portion of the light from the waveguide into an optical ring resonator at a first coupling region between the waveguide and the resonator, transmitting the light remaining in the waveguide into a cavity of electro-optic material embedded within the waveguide, and transmitting the light from the cavity to a second coupling region between the waveguide and the resonator. | 11-12-2015 |
20150338687 | PINNED DYNAMIC ELECTRO-OPTICAL PHASE SHIFTER - A semiconductor electro-optical phase shifter may include a substrate, an optical waveguide segment ( | 11-26-2015 |
20150346428 | GRAPHENE PLASMONIC COMMUNICATION LINK - A signal transfer link includes a first plasmonic coupler, and a second plasmonic coupler spaced apart from the first plasmonic coupler to form a gap. An insulator layer is formed over end portions of the first and second plasmonic couplers and in and over the gap. A plasmonic conductive layer is formed over the gap on the insulator layer to excite plasmons to provide signal transmission between the first and second plasmonic couplers. | 12-03-2015 |
20150362823 | OPTICAL MODULE AND TRANSMITTING DEVICE - An optical module includes an optical modulator that modulates light by using an electrical signal input from a first surface to a plurality of electrodes; and a flexible substrate that has a plurality of wiring patterns electrically connected to the plurality of electrodes, respectively, on the first surface. The optical modulator has a bulging part that bulges out from the first surface opposed to the flexible substrate toward the flexible substrate and is in contact with the flexible substrate. | 12-17-2015 |
20150378237 | Optical Modulator - An aspect of the present invention is an optical modulator, comprising a waveguide substrate and a multiplexing optical system. The waveguide substrate includes a first modulation portion, a second modulation, a first optical path and a second optical path. The multiplexing optical system includes a first surface and a second surface. First output light output from the first optical path and second output light output from the second optical path are input from the first surface and are output after there are combined at a combining point of the second surface. An optical path length between the first surface and the combining point in the first output light is larger than that of in the second output light. An optical path length between the first modulation portion and the first surface and an optical path length between the second modulation portion and the first surface are different. | 12-31-2015 |
20160004104 | SILICON OPTICAL MODULATOR USING ASYMMETRIC SHALLOW WAVEGUIDE AND THE METHOD TO MAKE THE SAME - The invention provides methods of forming an optical device, in particular, a silicon optical modulator using shallow rib waveguide structure. According to the embodiments of the present invention, the silicon optical waveguide modulator includes a shallow rib waveguide with asymmetric shoulder heights disposed on a surface of a substrate; one side terminated by the waveguide edge and the other side terminated by a second laterally oriented PN junction, a first vertically oriented PN junction is positioned inside the light propagation region of the waveguide; and higher doping regions with the same type of doping type of the adjoining regions are positioned on the asymmetric shoulders outside the light propagation regions in electrical contact with metal contacts. | 01-07-2016 |
20160011487 | OPTICAL MODULE AND TRANSMITTING APPARATUS | 01-14-2016 |
20160018600 | DELAY LINE INTERFEROMETER MULTIPLEXER - In an embodiment, a delay line interferometer (DLI) multiplexer (MUX) includes a first stage and a second stage. The first stage includes a first DLI and a second DLI. The first DLI includes a first left input, a first right input, and a first output and has a free spectral range (FSR) that is about four times a nominal channel spacing. The second DLI includes a second left input, a second right input, and a second output and has an FSR that is about four times the nominal channel spacing. The second stage is coupled to the first stage and includes a third DLI. The third DLI includes a third left input optically coupled to the first output, a third right input optically coupled to the second output, and a third output. An FSR of the third DLI is about two times the nominal channel spacing. | 01-21-2016 |
20160018677 | INTEGRATED LDMOS DEVICES FOR SILICON PHOTONICS - A device includes a laterally diffused metal-oxide-semiconductor (LDMOS) device integrated with an optical modulator. An optical waveguide of the optical modulator includes a silicon-containing structure in a drift region of the LDMOS device. | 01-21-2016 |
20160033797 | DEVICE FOR THE TEMPORAL SHAPING OF THE AMPLITUDE AND PHASE OF ULTRASHORT LIGHT PULSES - A device for the temporal shaping of the amplitude and phase of ultrashort pulses, includes: a birefringent waveguide | 02-04-2016 |
20160033848 | OPTICAL MODULATOR - An aspect of the present invention is an optical modulator including a substrate, a plurality of optical waveguides, and a plurality of modulation electrodes provided on the substrate in order to modulate light propagating through the optical waveguides. The modulation electrodes include signal electrodes, to which modulation signals are supplied, and ground electrodes. The signal electrodes include first and second signal electrodes. The ground electrodes include a first ground electrode provided between the first and second signal electrodes, a second ground electrode provided on the opposite side of the first signal electrode from the first ground electrode adjacent to the first signal electrode, and a third ground electrode provided on the opposite side of the second signal electrode from the first ground electrode adjacent to the second signal electrode. A concave groove is formed in each of the first to third ground electrodes. | 02-04-2016 |
20160054596 | LINEAR OPTICAL PHASE MODULATORS - Methods, systems, and devices are disclosed for linear optical phase modulators. In some aspects, a linear optical phase modulator device is provided to include a substrate; a PN junction formed on the substrate to include a P region, a N region and a depletion region formed by the P and N regions; and an optical waveguide formed on the substrate and structured to guide light in one or more optical modes to have a spatial optical intensity distribution based on a free carrier density spatial distribution in the PN junction in such that the depletion region exhibits a substantially linear response with regard to a voltage applied to the PN junction to modulate a phase of the light guided by the optical waveguide. | 02-25-2016 |
20160054640 | LINEARIZED BRAGG GRATING ASSISTED ELECTRO-OPTIC MODULATOR - The invention provides a new linearized electro-optic modulator in which linearization is achieved by modulating the index of a Bragg grating reflector placed in the arm(s) of a Michelson Interferometer. This grating-assisted Michelson Interferometer (GAMI) modulator operates as either an intensity or amplitude modulator, and is shown to significantly improve the linearity of microwave photonics links. Furthermore, this modulator improves the performance of optical communication systems using advanced modulation formats. | 02-25-2016 |
20160062155 | Optical Modulator - An optical modulator has a ridge optical waveguide and a modulation electrode. The modulation electrode is composed of a signal electrode to which a modulation signal is supplied, a first ground electrode, and a second ground electrode, the signal electrode has a wide portion having a width wider than the width of the uppermost portion of the ridge optical waveguide, the first ground electrode has a central portion ground electrode component provided on a first surface so as to extend along a first direction, and the second ground electrode has a central portion ground electrode component provided on a second surface so as to extend along the first direction. The central portion ground electrode components respectively have a first and a second through-holes, and these through-holes overlap the wide portion of the signal electrode as seen in a planar view. | 03-03-2016 |
20160062156 | ULTRA-RESPONSIVE PHASE SHIFTERS FOR DEPLETION MODE SILICON MODULATORS - A novel phase shifter design for carrier depletion based silicon modulators, based on an experimentally validated model, is described. It is believed that the heretofore neglected effect of incomplete ionization will have a significant impact on ultra-responsive phase shifters. A low VπL product of 0.3V·cm associated with a low propagation loss of 20 dB/cm is expected to be observed. The phase shifter is based on overlapping implantation steps, where the doses and energies are carefully chosen to utilize counter-doping to produce an S-shaped junction. This junction has a particularly attractive VπL figure of merit, while simultaneously achieving attractively low capacitance and optical loss. This improvement will enable significantly smaller Mach-Zehnder modulators to be constructed that nonetheless would have low drive voltages, with substantial decreases in insertion loss. The described fabrication process is of minimal complexity; in particular, no high-resolution lithographic step is required. | 03-03-2016 |
20160062207 | Multi-Segment Mach-Zehnder Modulator-Driver System - An optical modulator comprising a waveguide for propagating an optical signal comprising a proximate arm configured to communicate a proximate portion of the optical signal, and a distal arm configured to communicate a distal portion of the optical signal, a proximate diode configured to modulate the proximate portion of the optical signal, a distal diode configured to modulate the distal portion of the optical signal, and an electrical input electrically coupled to opposite signed interfaces of the proximate diode and the distal diode such that an electrical driving signal propagated along the electrical input causes an equal and opposite modulation of the proximate portion of the optical signal in the proximate arm of the waveguide and the distal portion of the optical signal in the distal arm of the waveguide. | 03-03-2016 |
20160085133 | DIFFERENTIAL TWE MZM DRIVER FOR SILICON PHOTONICS - A differential TWE MZM includes a differential driver, first and second capacitors, and first and second terminations. The differential driver includes a first differential output and a second differential output that collectively form a differential pair. The first differential output is DC coupled to a cathode of a first arm optical phase shifter of a TWE MZM. The second differential output is DC coupled to a cathode of a second arm optical phase shifter of the TWE MZM. The first capacitor AC couples the second differential output to an anode of the first arm optical phase shifter. The second capacitor AC couples the first differential output to an anode of the second arm optical phase shifter. The first and second terminations are coupled to the cathode and the anode of, respectively, the first or second arm optical phase shifter. | 03-24-2016 |
20160103382 | METHODS AND DEVICES FOR PHOTONIC M-ARY PULSE AMPLITUDE MODULATION - CMOS compatible SOI photonic integrated circuits (PICs) offer a low cost and promising solution to future short reach optical links operating beyond 100 Gb/s. A key building block in these optical links is the external optical modulator. Amongst, the PIC geometries for external modulators are those based upon ring resonators and Mach-Zehnder interferometers (MZI) where whilst the latter have been reported with increased thermal stability and fabrication tolerances, the former have demonstrated lower loss and lower driving voltages leading to a more energy efficient approach. Multi-segmented electrode structure based PAM optical modulator can potentially replace the analog digital-to-analog circuits (DACs) which are commonly used to achieve the multilevel electrical driving signal. Accordingly, it would be beneficial to combine the benefits of ring resonators to provide PAM-N modulators. It would be further beneficial for such PAM-N ring resonator modulators to exploit multi-segmented electrode structures to remove the requirements for high speed DACs. | 04-14-2016 |
20160109668 | DIRECT PRINTED CIRCUIT ROUTING TO STACKED OPTO-ELECTRICAL IC PACKAGES - An optical transmitter may include a chip stack that includes an electrical IC that is mounted using solder balls to a photonic chip. These solder connections permit the electrical IC and the photonic chip to communicate. In addition, the transmitter may include a PCB coupled to the stack so that electrical signals in the PCB are transmitted to the IC and photonic chip (and vice versa). Instead of coupling the PCB to the stack using wire bonds attached to pads on a surface of the photonic chip, at least a portion of the PCB is disposed between the photonic chip and electrical IC. The PCB may also include bond pads used to form a direct solder connection to the electrical IC. As such, the electrical IC may include direct solder connections to both the PCB and the photonic chip. | 04-21-2016 |
20160109731 | Thin Layer Photonic Integrated Circuit Based Optical Signal Manipulators - Integrated optical intensity or phase modulators capable of very low modulation voltage, broad modulation bandwidth, low optical power loss for device insertion, and very small device size are of interest. Such modulators can be of electro-optic or electro-absorption type made of an appropriate electro-optic or electro-absorption material in particular or referred to as an active material in general. An efficient optical waveguide structure for achieving high overlapping between the optical beam mode and the active electro-active region leads to reduced modulation voltage. In an embodiment, ultra-low modulation voltage, high-frequency response, and very compact device size are enabled by a semiconductor modulator device structure, together with an active semiconductor material that is an electro-optic or electro-absorption material, that are appropriately doped with carriers to substantially lower the modulator voltage and still maintain the high frequency response. In another embodiment, an efficient optical coupling structure further enables low optical loss. Various embodiments combined enable the modulator to reach lower voltage, higher frequency, low optical loss, and more compact size than previously possible in the prior arts. | 04-21-2016 |
20160109733 | ELECTRO-OPTIC PHASE MODULATOR - The electro-optic phase modulator, intended to modulate the optical phase of an incident lightwave, includes an electro-optic substrate with an entrance face and an exit face; an optical waveguide extending between a guide entrance end located on the entrance face and a guide exit end located on the exit face, the incident lightwave being partially coupled in the waveguide into a guided lightwave propagating in an optically guided manner along the optical path of the waveguide between the entrance end and the exit end; at least two electrodes arranged at least partially along the waveguide, parallel to and on either side of the latter, defining between each other an inter-electrode gap, which allow to introduce, when a modulation voltage is applied between them, a modulation phase-shift, function of the modulation voltage, on the guided lightwave. The waveguide has one first curved guide portion between the entrance end and the electrodes. | 04-21-2016 |
20160109734 | ELECTRO-OPTIC PHASE MODULATOR AND MODULATION METHOD - The electro-optic phase modulator intended to modulate the optical phase of a lightwave incident on the modulator, includes an electro-optic substrate having an entrance face and an exit face, an optical waveguide of refractive index (n | 04-21-2016 |
20160139485 | Multi-Electrode Photonic Digital To Analog Converting Vector Modulator - A digital-electronic-to-analog-optical converter, which has a structure consistent with a super-Mach-Zehnder interferometer, and which can perform the functionalities of both a Digital to Analog Converter (DAC) and a digital modulator uses a sub-Mach-Zender modulator to modulate optical wave signals propagating through its optical waveguide in a push-pull manner. The modulation performed is phase modulation realized with electrodes positioned near the optical wave guide where such electrodes carry modulation signals in digital, analog or discrete time signal format creating electromagnetic or electric fields that engage the optical wave signals traveling through the waveguide thus imparting a phase shift onto the optical wave signals. The amount of the phase shift can be implemented through the geometry of the electrodes, the length of time the modulating signal is applied, and the amplitude of the modulating signal. | 05-19-2016 |
20160139486 | SUB-VOLT DRIVE 100 GHZ BANDWIDTH ELECTRO-OPTIC MODULATOR - Electro-optical modulators and methods of fabrication are disclosed. An electro-optical modulator includes a Mach-Zehnder interferometer formed in a substrate removed semiconductor layer and a coplanar waveguide. Signals from the coplanar waveguide are capacitively coupled to the Mach-Zehnder interferometer through first and second dielectric layers having strong dielectric constant dispersion. | 05-19-2016 |
20160161771 | OPTICAL MODULE - An optical module includes a package, a substrate, a lead pin, and a ground pattern. The substrate is accommodated in the package, includes a signal line pattern that transmits an electric signal, extends toward a side wall of the package beyond an end of the signal line pattern, and has a through hole between the end of the signal line pattern and the side wall of the package. The lead pin is inserted into the through hole in the substrate and inputs the electric signal to the end of the signal line pattern. The ground pattern is provided in at least a part of regions surrounding the through hole on the substrate. | 06-09-2016 |
20160170240 | ELECTRO-OPTICAL MODULATOR USING RIBBED WAVEGUIDES | 06-16-2016 |
20160170242 | OPTICAL MODULATOR WITH PLASMON BASED COUPLING | 06-16-2016 |
20160170284 | ELECTRO-OPTICAL MODULATOR WITH BIAS CONTROL | 06-16-2016 |
20160195791 | DIFFERENTIAL TWE MZM DRIVER FOR SILICON PHOTONICS | 07-07-2016 |
20160202502 | STRESS-TUNED PLANAR LIGHTWAVE CIRCUIT AND METHOD THEREFOR | 07-14-2016 |
20160202503 | SILICON ELECTRO-OPTICAL MODULATOR | 07-14-2016 |
20160202592 | INDUCTANCE-TUNED ELECTRO-OPTIC MODULATORS | 07-14-2016 |
20160377892 | MULTIBAND QAM INTERFACE FOR SLAB WAVEGUIDE - The present disclosure relates to an integrated chip having a multiband transmission and reception elements coupled to an integrated dielectric waveguide. In some embodiments, the integrated chip has a dielectric waveguide disposed within an inter-level dielectric (ILD) structure over a substrate. A multiband transmission element having a plurality of phase modulation elements is configured to generate a plurality of modulated signals in different frequency bands. A plurality of transmission electrodes are located along a first side of the dielectric waveguide and are respectively configured to couple one of the plurality of modulated signals into the dielectric waveguide. | 12-29-2016 |
20170235208 | ENHANCED ORGANIC ELECTRO-OPTIC POLING THROUGH NANOPARTICLE DOPING | 08-17-2017 |
20170237229 | PHOTONIC TRANSMITTER | 08-17-2017 |
20180024410 | OPTICAL MODULATOR AND METHOD OF MANUFACTURING SAME | 01-25-2018 |
20180024411 | FPC-ATTACHED OPTICAL MODULATOR AND OPTICAL TRANSMISSION DEVICE USING THE SAME | 01-25-2018 |
20190146301 | CALIBRATION FOR AN OPTICAL DEVICE | 05-16-2019 |
20220137478 | Optical Modulator - A optical modulator with reduced with a reduced amount of ripple is provided. A Mach-Zehnder optical modulator includes a phase modulation unit including optical waveguides having a PN junction structure and traveling wave electrodes, and a dummy phase modulation unit including portions of the traveling wave electrodes, the portions being obtained by forming the respective traveling wave electrodes longer than the phase modulation unit in the light propagation direction of the phase modulation unit, and optical waveguides having the same PN junction structure as that of the optical waveguides of the phase modulation unit and not connected to the optical waveguides of the phase modulation unit. | 05-05-2022 |