Entries |
Document | Title | Date |
20080239467 | OPTICAL AMPLIFIER - An optical amplifier including: a first amplifying unit amplifying an input light by utilizing a first excitation light and thereby outputting a first amplified light; a second amplifying unit amplifying the first amplified light by utilizing a second excitation light and thereby outputting a second amplified light; and a control unit detecting a first absorption rate of the first excitation light and a second absorption rate of the second excitation light, and controlling a level of the first excitation light and a level of second excitation light based on the first absorption rate and the second absorption rate. The first absorption rate corresponds to a ratio of the first excitation light absorbed in the first amplifying unit, and the second absorption rate corresponds to a ratio of the second excitation light absorbed in the second amplifying unit. | 10-02-2008 |
20080239468 | OPTICAL DIRECT AMPLIFIER FOR WDM OPTICAL TRANSMISSION - An optical direct amplifier lowers the power consumption with a simple structure at a low cost. This amplifier includes an optical amplification medium (e.g., optical fiber) that carries out an optical amplification function in response to optical excitation by an exciting light source (e.g., semiconductor laser); a temperature controller for controlling the temperature of the amplification medium; a heat radiating member for radiating the heat generated by the light source; and a heat transmission regulator (e.g., Peltier module) for allowing the heat to flow into the amplification medium from the light source and for preventing the heat from flowing into the light source from the amplification medium. The amplification medium is heated by application of the heat generated by the light source by way of the heat radiating member and the heat transmission regulator. | 10-02-2008 |
20080266648 | SIGNAL LIGHT MONITORING APPARATUS, OPTICAL AMPLIFICATION APPARATUS AND OPTICAL RECEPTION APPARATUS, AND SIGNAL LIGHT MONITORING METHOD - According to an aspect of an embodiment, an apparatus includes an optical branching unit for branching an input signal light in four directions, a polarization component extraction unit extracting four polarization components having mutually different polarization parameters from lights branched in four directions by the optical branching unit, and a determination unit determining input/non-input of the signal light based on the four polarization components extracted by the polarization component extraction unit. | 10-30-2008 |
20090046352 | Low-average-power parabolic pulse amplifiction - There is provided a parabolic pulse amplifier for amplifying a pulse light signal. The amplifier comprises an ytterbium-doped amplification waveguide pumped using a pump source with a pump central wavelength substantially offset from the absorption transition peak wavelength. The pump wavelength is selected such that the absorption coefficient of pump light and the gain coefficient of the signal are substantially equal in the amplification waveguide such that the amplification gain is distributed substantially uniformly along the amplification waveguide. | 02-19-2009 |
20090052013 | THZ WAVE GENERATOR - The present invention purposes to provide a THz-wave generator capable of generating a THz-wave stably and efficiently, and particularly, to provide the THz-wave generator which is stable against a frequency shift of a laser source and which can easily vary the frequency of the THz-wave. | 02-26-2009 |
20090052014 | SOLID-STATE LIGHT SOURCE BASED ILLUMINATION APPARATUS AND PROJECTION SYSTEM HAVING SAME - An exemplary illumination apparatus for use in a projection system includes a number of solid-state light sources and first non-imaging collection optics, a power coupler, an optical amplifier, and a second non-imaging collection optic. The solid-state light sources are configured to generate light of a predetermined wavelength. Each first non-imaging collection optic is configured to collect and transmit light from a respective solid-state light source to the power coupler. The power coupler is configured to combine light from the solid-state light sources. The optical amplifier is configured to amplify the combined light. The second non-imaging collection optic is configured to collect the amplified light to provide illumination. | 02-26-2009 |
20090067037 | OPTICAL AMPLIFICATION APPARATUS AND OPTICAL COMMUNICATION APPARATUS - An optical amplification apparatus includes an optical amplification medium which has an input end and an output end, and amplifies an optical signal by a predetermined amplification rate; a first light source for launching excited light which excites the optical amplification medium; an isolator connected to the output end of the optical amplification medium; and a second light source for launching idle light which has a predetermined wavelength and is launched into the optical amplification medium from a point between the optical amplification medium and the isolator. The optical amplification medium, the first light source, the isolator, and the second light source are contained in the package of the optical amplification apparatus. The apparatus may further include a set of an optical absorption member for absorbing the idle light and an circulator connected to the input end of the optical amplification medium, or an input-side isolator connected to the input end of the optical amplification medium. | 03-12-2009 |
20090153949 | OPTICAL TRANSMISSION MODULE AND MANUFACTURING METHOD OF THE SAME - [Problems] To accommodate a plurality of optical semiconductor elements in one package with their optical axes aligned highly precisely. | 06-18-2009 |
20090161201 | Drive laser for EUV light source - A device is described herein which may comprise an oscillator having an oscillator cavity length, L | 06-25-2009 |
20090303575 | SELF-ADAPTING FEED FORWARD CONTROL APPARATUS AND METHOD IN AN OPTICAL AMPLIFIER - A Self-adapting feed forward control apparatus in an optical amplifier includes a feed forward controller for collecting target output power (Pout) and controlling drive current of a pump laser in the optical amplifier; a feedback controller for calculating target output power (Pt) and collecting actual output power (Pout), calculating deviation between (Pt) and (Pout), and controlling drive current of the pump laser; and a parameter estimator for collecting power target, output power and summation of output signal of the feed forward controller and feedback controller, and estimating the feed forward parameter and updating the parameter of the feed forward controller. The apparatus can automatically correct the feed forward control parameters according to the variation of EDFA parameters due to environmental condition changes or device aging. | 12-10-2009 |
20100027102 | Variable metamaterial apparatus - Artificial materials, such as metamaterials, include adjustable properties. In some approaches the properties are adjustable according to active feedback of interaction with electromagnetic waves. | 02-04-2010 |
20100033807 | Optical Switch Assembly and Network Incorporating Same - An optical switch assembly comprising at least two optical amplifiers ( | 02-11-2010 |
20100157415 | REGULATABLE OPTICAL AMPLIFIER, AND METHOD FOR REGULATING AN OPTICAL AMPLIFIER - The invention relates to a regulatable optical amplifier which has at least two series-connected amplifier groups, each amplifier group having a regulating device. Connected upstream of the optical amplifier is a power monitor device for detecting changes in the input power, whose electrical output is connected both to the first regulating device and to the second regulating device. In line with the invention, the first and second regulating devices have a control line inserted between them which comprises a series circuit containing a high-pass filter, a delay and signal-shaping unit and a feed-forward control unit for generating a correction signal for the second regulating device. In this arrangement, the high-pass filter has a cut-off frequency which corresponds approximately to the cut-off frequency of the first amplifier group. The inventive control line optimizes the regulating response such that power transients in the output signal from the optical amplifier are reduced particularly after an abrupt change in the input power. | 06-24-2010 |
20100296154 | METHOD AND APPARATUS FOR GENERATION AND DETECTION OF ROGUE WAVES - Methods and systems are provided for generation and detection of rogue waves, including hydrodynamic rogue waves and optical rogue waves. A method for generating an optical rogue wave comprises the steps of generating an input pulse into a nonlinear optical medium, and perturbing the input pulse by directing a narrow-band seed radiation into the input pulse. The seed radiation has a frequency and timing to generate broadband radiation within the nonlinear optical medium. | 11-25-2010 |
20110007384 | LASER AMPLIFIED POWER EXTRACTION ENHANCEMENT SYSTEM AND METHOD - A high extraction efficiency laser system. The novel laser system includes a laser amplifier and a laser source adapted to provide a laser beam to the amplifier such that polarization states for incident and reflected light within the amplifier are perpendicular one to another. In an illustrative embodiment, the laser beam is input to the amplifier such that the beam reflects back and forth between the side walls of the amplifier with an angle of incidence of about 45 degrees, and the laser beam is linearly polarized in the plane of incidence. This arrangement reduces interference fringes in the amplifier. In an alternative embodiment, the system includes an aberrator adapted to add time-varying aberrations in the laser beam at a rate exceeding an inversed lifetime of an inverted population in the amplifier to increase spatial homogenization of saturation and extraction patterns in the amplifier. | 01-13-2011 |
20110019267 | CARRIER ENVELOPE PHASE STABILIZATION OF AN OPTICAL AMPLIFIER - A laser and amplifier combination delivers a sequence of optical pulses. Pulses from the laser are temporally stretched by a pulse stretcher before amplification and temporally compressed by a pulse compressed after amplification. The pulse stretcher includes a diffraction grating on which pulses being compressed are incident. An arrangement is provided for measuring the carrier-envelope phase of the pulses and adjusting the incidence angle of pulses on the grating cooperative with the measurement such that the carrier envelope phase of the pulses in the sequence is about constant. | 01-27-2011 |
20110058249 | METHOD AND SYSTEM FOR COMPACT AND EFFICIENT HIGH ENERGY PULSED LASER AMPLIFIER - An optical amplifier system includes an input aperture operable to receive light propagating along an optical path in a first direction and a first polarizer disposed along the optical path. The first polarizer is operable to pass light having a polarization state aligned with a first polarization axis. The system also includes a first Pockels cell operable to receive light passing through the first polarizer, an optical gain element disposed along the optical path, a second Pockels cell disposed along the optical path, and a second polarizer disposed along the optical path. The second polarizer is operable to pass light having a polarization state aligned with the first polarization axis. The system further includes a first mirror operable to receive light reflected from the second polarizer, a second mirror operable to receive light reflected from the first polarizer, and an output aperture operable to transmit light passing through the second polarizer. | 03-10-2011 |
20110122483 | AXIAL WALK OFF MULTI-PASS AMPLIFIERS - The various laser architectures described herein provide increased gain of optical energy as well as compensation of optical phase distortions in a thin disk gain medium. An optical amplifier presented herein provides for scalable high energy extraction and gains based on a number of passes of the signal beam through a gain medium. Multiple, spatially separate, optical paths may also be passed through the same gain region to provide gain clearing by splitting off a small percentage of an output pulse and sending it back through the amplifier along a slightly different path. By clearing out the residual gain, uniform signal amplitudes can be obtained. | 05-26-2011 |
20110157686 | Wavelength-Tunable Light Source - In at least one embodiment of the wavelength-tunable light source ( | 06-30-2011 |
20110164309 | GAIN AND SIGNAL LEVEL ADJUSTMENTS OF CASCADED OPTICAL AMPLIFIERS - An optical amplification device which includes first and second optical amplifiers, and a controller. The first optical amplifier receives a light and amplifies the received light. The second optical amplifier receives the light amplified by the first optical amplifier, and amplifies the received light. When a level of the light received by the first optical amplifier changes by Δ, the controller controls a level of the light received by the second optical amplifier to change by approximately −Δ. In various embodiments, the controller causes the sum of the gains of the first and second optical amplifiers to be constant. In other embodiments, the optical amplification device includes first and second optical amplifier and a gain adjustor. The gain adjustor detects a deviation in gain of the first optical amplifier from a target gain, and adjusts the gain of the second optical amplifier to compensate for the detected deviation. | 07-07-2011 |
20110279887 | SELF-COLLIMATOR PLANAR SPECTROSCOPY SHAPING DEVICE FOR CHIRPED-PULSE-AMPLIFICATION - A self-collimator planar spectroscopy shaping device for chirped pulse amplification (CPA): uses a spectrum decomposing system with CTSI construction, a spectrum synthesizing system with CTSI structure that is symmetrical to the decomposing structure, and a spectrum shaping system including an aperture and a planar reflector for spectrum shaping function design. The device accomplishes the following functions: firstly decomposing the spectrum of a chirped temporal pulse laser to a spectral domain; then shaping the spectrum in the spectral domain; finally synthesizing un-shiftily this shaped spectrum in the spectral domain into a temporal chirped pulse with a designed shape. The device has features of small size of concave reflector, easy fabrication, compact construction, little laboratory space needed, and cheap in cost, which it can be different types of configuration for different circumstance application, which it can be not only utilized in a general laser spectrum shaping and spectrum modulation, but also can be utilized for a high energy and ultra-high peak-power laser system in chirped pulse amplification with a large caliber and with a chirped pulse bandwidth of a few nanometers. | 11-17-2011 |
20110286083 | BACKSIDE ILLUMINATED SEMICONDUCTOR LIGHT-RECEIVING DEVICE, OPTICAL RECEIVER MODULE, AND OPTICAL TRANSCEIVER - Provided is a backside illuminated semiconductor light-receiving device enhancing a frequency characteristic without deteriorating assembling operability. The light-receiving device includes a rectangular substrate; a light receiving mesa portion formed on a center portion of one side on a front surface of the substrate and includes a PN junction portion; a P-type electrode formed on the light receiving mesa portion and conductive with one side of the PN junction portion; an N-type electrode mesa portion formed on one corner portion of the one side; an N-type electrode pulled out to the N-type electrode mesa portion and conductive with the other side of the PN junction portion; a P-type electrode mesa portion and a dummy electrode mesa portion formed in a region including three other corner portions; and a dummy electrode formed on the dummy electrode mesa portion. | 11-24-2011 |
20110317255 | TRANSMISSION APPARATUS AND TRANSMISSION SYSTEM - An optical transmission apparatus includes an optical amplifier configured to amplify a wavelength-division multiplexed signal light using an amplifying medium doped with a rare earth ion, a first optical transmitter configured to output a wavelength of a dual-polarization-multiplexed signal to a short wavelength side of an amplification band of the optical amplifier, a second optical transmitter configured to output a wavelength of a non polarization-multiplexed signal to a long wavelength side of the amplification band of the optical amplifier, and an optical multiplexer configured to input a wavelength-division multiplexed signal to the optical amplifier, the wavelength-division multiplexed signal comprising the non polarization-multiplexed signal and the dual-polarization-multiplexed signal. | 12-29-2011 |
20120002270 | OPTICAL TRANSMISSION SYSTEM - An optical transmission system includes an optical transmitter that sends signal light to a transmission path, an optical receiver that receives the signal light from the transmission path, and an optical amplifier that is provided on the transmission path and that amplifies the signal light, the optical amplifier being configured to control a gain characteristic of the optical amplifier such that a power of signal light having a wavelength included within a wavelength range in which polarization hole burning occurs is higher than a power of another signal light having a wavelength outside the wavelength range. | 01-05-2012 |
20120105944 | CIRCUIT SWITCHABLE OPTICAL DEVICE - A circuit switched optical device includes a first array of intersecting hollow waveguides formed in a first plane of a substrate. A second array of intersecting hollow waveguides is formed in a second plane of the substrate, and the second plane is positioned parallel to the first plane. An optical element within the first array selectively redirects an optical signal from the first array to the second array. | 05-03-2012 |
20130120830 | LOW NOISE PHOTO-PARAMETRIC SOLID STATE AMPLIFIER - A solid state detection system includes a degenerate photo-parametric amplifier (PPA), wherein the PPA comprises a photo diode, and a periodically pulsed light source, wherein the photo-parametric amplifier (PPA) is synchronized to the pulsed light source with a phase locked loop that generates a pump waveform for the PPA at twice the frequency of the excitation pulse rate. | 05-16-2013 |
20140078579 | OPTICAL OUTPUT LEVEL CONTROL APPARATUS - An optical output level control apparatus includes a detector configured to detect power of an input optical signal; an amplifier configured to amplify the input optical signal; a memory configured to store data that define a first curved line representing a relationship between the input power and a drive voltage of the amplifier for obtaining a first output level and data that defines a second curved line representing a relationship between the input power and the drive voltage of the amplifier for obtaining a second output level; a generator configured to correct at least one of the first and second curved lines and generate a target curved line representing a relationship between input power and a drive voltage of the amplifier for obtaining a target output level through interpolation based on the first and second curved lines at least one of which is corrected. | 03-20-2014 |
20140300949 | OPTICAL PULSE GENERATOR - An optical pulse generator and a method for using the same, where the optical pulse generator includes a source to deliver a chirped pulse and a chirped pulse compressor, and a first manipulation device and a second manipulation device capable of wavelength dependent manipulating the propagation direction of the chirped pulse and a focusing device having a predetermined focus point. The second manipulation device is arranged after the first manipulation device in propagation direction of the chirped pulse and the first and the second manipulation device are capable of manipulating the propagation direction of the chirped pulse such that the chirped pulse is transformed, after passing the second manipulation device, into a pulse, wherein different chromatic parts of the pulse are spatially spread and temporarily fully aligned. | 10-09-2014 |
20140300950 | LASER APPARATUS - A laser apparatus includes at least one oscillator configured to output a first laser beam; a filter device provided in a beam path of the first laser beam, the filter device including either an optical element having transmittance properties depending on a polarization direction and a wavelength and a filter device including a wavelength dispersive element; and at least one amplifier configured to amplify a second laser beam from the filter device and output as a third laser beam. | 10-09-2014 |
20140368901 | METHOD AND SYSTEM FOR COMPACT, MULTI-PASS PULSED LASER AMPLIFIER - A laser amplifier includes an input aperture operable to receive laser radiation having a first polarization, an output aperture coupled to the input aperture by an optical path, and a polarizer disposed along an optical path. A transmission axis of the polarizer is aligned with the first polarization. The laser amplifier also includes n optical switch disposed along the optical path. The optical switch is operable to pass the laser radiation when operated in a first state and to reflect the laser radiation when operated in a second state. The laser amplifier further includes an optical gain element disposed along the optical path and a polarization rotation device disposed along the optical path. | 12-18-2014 |
20150138629 | LOW NOISE PHOTO-PARAMETRIC SOLID STATE AMPLIFIER - A solid state detection system includes a degenerate photo-parametric amplifier (PPA), wherein the PPA comprises a photo diode, and a periodically pulsed light source, wherein the photo-parametric, amplifier (PPA) is synchronized to the pulsed light source with a phase locked loop that generates a pump waveform for the PPA at twice the frequency of the excitation pulse rate. | 05-21-2015 |
20150340829 | Beam Reverser Module and Optical Power Amplifier Having Such a Beam Reverser Module - A beam reverser module for an optical power amplifier of a laser arrangement comprises at least one reflecting surface for receiving an incoming laser beam propagating in a first direction and reflecting the incoming laser beam into a second direction different from the first direction, wherein the at least one reflecting surface is a highly reflecting surface of at least one mirror. | 11-26-2015 |
20160013611 | Optical Amplifier Arrangement | 01-14-2016 |
20160116821 | OPTICAL REFLECTOR BASED ON A DIRECTIONAL COUPLER AND A COUPLED OPTICAL LOOP - An optical device includes an optical reflector based on a coupled-loopback optical waveguide. In particular, an input port, an output port and an optical loop in arms of the optical reflector are optically coupled to a directional coupler. The directional coupler evanescently couples an optical signal between the arms. For example, the directional coupler may include: a multimode interference coupler and/or a Mach-Zehnder Interferometer (MZI). Moreover, destructive interference during the evanescent coupling determines the reflection and transmission power coefficients of the optical reflector. | 04-28-2016 |
20160197448 | TEMPORAL PULSE SHAPING FOR LASER BOND INSPECTION | 07-07-2016 |