Patent application number | Description | Published |
20080279243 | Distributed Feedback (Dfb) Quantum Dot Laser Structure - A distributed feedback (DFB) quantum dot semiconductor laser structure is provided. The DFB quantum dot semi-conductor laser structure includes: a first clad layer formed on a lower electrode; an optical waveguide (WG) formed on the first clad layer; a grating structure layer formed on the optical WG and including a plurality of periodically disposed gratings; a first separate confinement hetero (SCH) layer formed on the grating structure layer; an active layer formed on the first SCH layer and including at least a quantum dot; a second SCH layer formed on the active layer; a second clad layer formed on the second SCH layer; an ohmic layer formed on the second clad layer; and an upper electrode formed on the ohmic layer. Accordingly, an optical WG is disposed on the opposite side of the active layer from the grating structure layer, thereby increasing single optical mode efficiency. And, an asymmetric multi-electrode structure is used for applying current, thereby maximizing purity and efficiency of the single mode semiconductor laser structure. | 11-13-2008 |
20100092175 | REFLECTIVE SEMICONDUCTOR OPTICAL AMPLIFIER AND OPTICAL SIGNAL PROCESSING METHOD USING THE SAME - Provided are a semiconductor optical amplifier and an optical signal processing method using the same. The reflective semiconductor optical amplifier includes: an optical signal amplification region operating to allow a downward optical signal incident from the external to obtain a gain; and an optical signal modulation region connected to the optical signal amplification region and generating a modulated optical signal. The downward optical signal is amplified through a cross gain modulation using the modulated optical signal and is outputted as an upward optical signal. | 04-15-2010 |
20100158427 | OPTICAL AMPLIFIER - An optical amplifier includes a passive waveguide region and an active waveguide region. The passive waveguide region is configured to receive an incident optical signal and adjust a mode of the optical signal. The active waveguide region is integrated to the passive waveguide region and configured to perform gain modulation on the optical signal received from the passive waveguide region by changing density of carriers in response to a current applied to the active waveguide region. Internal loss of the active waveguide region is adjusted to produce a resonance effect and thereby to increase bandwidth of the active waveguide. Therefore, the optical amplifier can have a wide bandwidth under a low-current condition. | 06-24-2010 |
20100252094 | High-Efficiency Solar Cell and Method of Manufacturing the Same - Provided are a high-efficiency solar cell, which converts light energy of incident light into electrical energy, and a method of manufacturing the same. An upper ohmic layer is formed at a predetermined tilt angle less than 45° and an ohmic electrode is deposited on the upper ohmic layer so as to reduce shadow loss due to the ohmic electrode and lessen contact resistance. | 10-07-2010 |
20100316383 | WAVELENGTH DIVISION MULTIPLEXED-PASSIVE OPTICAL NETWORK APPARATUS - Provided is a wavelength division multiplexed-passive optical network (WDM-PON) apparatus. The WDM-PON includes an optical source unit, an optical mux, and a chirped Bragg grating. The optical source unit generates an optical signal. The optical mux receives the optical signal from the optical source unit through one end of the optical mux, multiplexes the optical signal, and outputs the multiplexed optical signal. The chirped Bragg grating is connected to the other end of the optical mux. The chirped Bragg grating again reflects the optical signal having passed the optical mux to re-input a certain portion of the optical signal into the optical mux and the optical source unit. The optical mux performs a spectrum slicing on the re-inputted optical signal and operates the optical source unit using a channel wavelength of the optical mux as a main oscillation wavelength. | 12-16-2010 |
20110134513 | OPTICAL DEVICE MODULE - Provided is an optical device module that can improve miniaturization and integration. The optical device module includes a semiconductor optical amplifier having a buried structure and including a first active layer buried in a clad layer disposed on a first substrate, an optical modulator in which a sidewall of a second active layer disposed in a direction of the first active layer on a second substrate junctioned to the first substrate is exposed, the optical modulator having a ridge structure, and at least one multi-mode interference coupler in which the second active layer junctioned to the first active layer is buried in the clad layer, the multi-mode interference coupler sharing the second active layer on the second substrate between the optical modulator and the semiconductor optical amplifier and integrated with the second optical device. | 06-09-2011 |
20120093178 | WAVELENGTH TUNABLE EXTERNAL CAVITY LASER GENERATING DEVICE - Provided is a wavelength tunable external cavity laser generating device. The wavelength tunable external cavity laser generating devices includes: an optical amplifier, a comb reflector, and an optical signal processor connected in series on a first substrate; and an external wavelength tunable reflector disposed on a second substrate adjacent to the first substrate and connected to the optical amplifier, wherein the comb reflector includes: a waveguide disposed on the first substrate; a first diffraction grating disposed at one end of the waveguide adjacent to the optical amplifier; and a second diffraction grating disposed at the other end of the waveguide adjacent to the optical signal processor, wherein the optical amplifier, the comb reflector, and the optical signal processor constitute a continuous waveguide. | 04-19-2012 |
20120106578 | WAVELENGTH-TUNABLE EXTERNAL CAVITY LASER GENERATING DEVICE - A wavelength-tunable external cavity laser generating device is provided. The wavelength-tunable external cavity laser generating device includes a reflection-type multi-mode interferometer, an optical amplifier disposed between the reflection-type multi-mode interferometer and an external wavelength-tunable reflector to amplify light, and an optical signal processor configured to process light from the reflection-type multi-mode interferometer. The reflection-type multi-mode interferometer includes a multi-mode waveguide, an input waveguide connecting the optical amplifier and one end of the multi-mode waveguide, and an output waveguide configured to connect the optical signal processor and the other end of the multi-mode waveguide. | 05-03-2012 |
20120281274 | SEMICONDUCTOR OPTICAL DEVICES AND METHODS OF FABRICATING THE SAME - A semiconductor optical device includes a first mode converting core, a light amplification core, a second mode converting core, and a light modulation core disposed in a first mode converting region, a light amplification region, a second mode converting region, and a light modulating region of a semiconductor substrate, respectively, and a current blocking section covering at least sidewalls and a top surface of the light amplification core. The first mode converting core, the light amplification core, the second mode converting core, and the light modulation core are arranged along one direction in the order named, and are connected to each other in butt joints. The current blocking section includes first, second, and third cladding patterns sequentially stacked. The second cladding pattern is doped with dopants of a first conductivity type, and the first and third cladding patterns are doped with dopants of a second conductivity type. | 11-08-2012 |
20130163621 | EXTERNAL CAVITY TUNABLE LASER MODULE - Disclosed is an external cavity tunable laser module including a substrate; a mirror surface that is formed on the substrate to reflect a laser incoming from the outside; a transmissive liquid crystal filter that is formed at a rear side of the mirror surface to select and tune a wavelength of the laser reflected through the mirror surface; and a light source chip that is formed at a rear side of the transmissive liquid crystal filter to reflect the laser that passes through the transmissive liquid crystal filter at a specific wavelength interval to form a plurality of channels and tune wavelengths of the channels. | 06-27-2013 |
20130163916 | OPTICAL WAVEGUIDE PLATFORM WITH HYBRID-INTEGRATED OPTICAL TRANSMISSION DEVICE AND OPTICAL ACTIVE DEVICE AND METHOD OF MANUFACTURING THE SAME - Disclosed are an optical waveguide platform with integrated active transmission device and monitoring photodiode. The optical waveguide platform with hybrid integrated optical transmission device and optical active device includes an optical waveguide region formed by stacking a lower cladding layer, a core layer and an upper cladding layer on a substrate; a trench region formed by etching a portion of the optical waveguide region; and a spot expanding region formed on the core layer in the optical waveguide region, in which the optical transmission device is mounted in the trench region and the optical active device is flip-chip bonded to the spot expanding region. The monitoring photodiode is flip-chip bonded to the spot expanding region of the core layer of the optical waveguide, thereby monitoring output light including an optical coupling loss that occurs during flip-chip bonding. | 06-27-2013 |
20130163993 | DIRECTLY-COUPLED WAVELENGTH-TUNABLE EXTERNAL CAVITY LASER - Disclosed is a directly-coupled wavelength-tunable external cavity laser including a gain medium that generates an optical signal by an applied bias current; an optical waveguide structure that is coupled to the gain medium to form a minor surface and causes lasing in the mirror surface when the applied bias current has a threshold or higher; and a radio frequency transmission medium that adds a radio frequency signal to the applied bias current to adjust an operating speed of the optical signal. | 06-27-2013 |
20130209094 | OPTICAL LINE TERMINAL FOR BIDIRECTIONAL WAVELENGTH-DIVISION-MULTIPLEXING OPTICAL NETWORK - The present disclosure relates to an optical line terminal, the disclosure includes: an optical transmitter for generating a low speed downstream optical signal; a wavelength-multiplexer for wavelength-multiplexing the downstream optical signal; a first optical power branching tap coupler for allowing wavelength-multiplexed downstream optical signal to branch off; a wavelength band separator/coupler for separating between the wavelength-multiplexed downstream optical signal and a wavelength-multiplexed upstream optical signal; a circulation type wavelength-demultiplexer for wavelength-demultiplexing a downstream optical signal branched off by the first optical power branching tap coupler and an upstream optical signal separated by the wavelength band separator/coupler; an optical receiver for outputting a downstream electrical signal by using the wavelength-demultiplexed optical signal; and a signal processing module for controlling an optical power and a wavelength of the optical transmitter according to a strength of the downstream electrical signal. | 08-15-2013 |
20130209105 | WAVELENGTH-SHIFTED BIDIRECTIONAL WAVELENGTH DIVISION MULTIPLEXING OPTICAL NETWORK - Disclosed is a wavelength-shifted bidirectional WDM optical network including: an optical line terminal including an optical line terminal (OLT) including a first optical transmitter transmitting a downstream WDM optical signal, a first high-density wavelength multiplexer/demultiplexer wavelength-multiplexing the downstream WDM optical signal or wavelength-demultiplexing a wavelength-multiplexed upstream WDM optical signal, and a first optical receiver receiving the wavelength-demultiplexed upstream WDM optical signal; a remote node (RN) including a second high-density wavelength multiplexer/demultiplexer shifting a center wavelength of the upstream WDM optical signal and wavelength-multiplexing the upstream WDM optical signal with the shifted center wavelength or wavelength-demultiplexing the wavelength-multiplexed downstream WDM optical signal; and multiple optical network units (ONUs) each including a second optical transmitter transmitting the upstream WDM optical signal and second optical receiver receiving the wavelength-demultiplexed downstream WDM optical signal. | 08-15-2013 |
20130243013 | TUNABLE LASER MODULE - The present disclosure relates to a tunable laser module including a light gain area unit for outputting an optical signal; an optical distributor for separating the optical signal output from the light gain area unit; two comb reflection units for reflecting a part of optical signals separated by the optical distributor and allow a part of the optical signals to penetrate; two phase units for changing phases of the optical signals penetrating the two comb reflection units; an optical coupler for combining the optical signals of which the phases are changed by the two phase units; and an optical amplifier for amplifying the optical signal combined by the optical coupler, wherein the light gain area unit oscillates a laser by totally reflecting the optical signals reflected by the two comb reflection units. | 09-19-2013 |
20140023313 | HYBRID INTEGRATED OPTICAL DEVICE AND FABRICATION METHOD THEREOF - Disclosed are a hybrid integrated optical device capable of more easily implementing impedance matching of a transmission line by using a polymer material on which a low-temperature process may be performed when an optical waveguide platform is fabricated, and a fabrication method thereof. The hybrid integrated optical device according to an exemplary embodiment of the present disclosure includes: a substrate divided into a waveguide region and a line region; a lower clad layer formed of silica and formed on the substrate; a transmission line part formed on the lower clad layer of the line region; and a height adjustment layer, a core layer, and an upper clad layer formed of a polymer and sequentially formed on the lower clad layer of the waveguide region, in which an optical waveguide is formed on the core layer. | 01-23-2014 |
20140064306 | COMPACT EXTERNAL CAVITY TUNABLE LASER APPARATUS - The present disclosure relates to a compact external cavity tunable laser apparatus. The laser apparatus includes a substrate, an external cavity tunable reflecting unit that reflects laser light entering from the outside on the substrate and selects and varies a wavelength of the reflected laser light, an optical fiber that outputs the laser light on the substrate; and an highly integrated light source that integrates the laser light input from the external cavity tunable reflecting unit using inclined input and output waveguides, a curved waveguide, and a straight waveguide to output the integrated laser light to the optical fiber in order to match an optical axis formed with the external cavity tunable reflecting unit with an optical axis formed with an optical fiber. | 03-06-2014 |
20140233945 | WAVELENGTH DIVISION MULTIPLEXING OPTICAL TRANSMITTING APPARATUS AND OPERATING METHOD OF THE SAME - Provided is a wavelength division multiplexing (WDM) optical transmitting apparatus including first to n-th optical transmitters configured to output first to n-th optical signals having different wavelengths, respectively; a wavelength multiplexer configured to multiplex the first to n-th optical signals and generate an output optical signal; a tap coupler configured to receive the output optical signal and generate a controlling optical signal based on some of the output optical signal; a controlling photodetector configured to receive the controlling optical signal and output an optical current based on the controlling optical signal; and a controller configured to control each of the first to n-th optical transmitters based on the optical current, wherein the controller comprises a look-up table, sequentially detects driving conditions for the first to n-th optical transmitters, stores the detected driving conditions in the look-up table, and controls the first to n-th optical transmitters based on the detected driving conditions. | 08-21-2014 |
20140270811 | MULTI-CHANNEL OPTICAL RECEIVING MODULE - A multi-channel optical receiving module includes a first substrate disposed on a bench, optical fibers disposed in grooves of the first substrate, a first lens disposed on the first substrate and collimating optical signals through the optical fibers, a second substrate disposed on the bench at a side of the first substrate, a light receiving device disposed on the second substrate, a second lens disposed over the light receiving device, a mirror reflecting the optical signals between the first lens and the second lens, and a block fixing the mirror. The block includes through-holes transmitting the optical signals between the first and second lenses without refraction of the optical signals. | 09-18-2014 |
20150063832 | MULTI-CHANNEL RECEIVER OPTICAL SUB ASSEMBLY - Disclosed is a multi-channel receiver optical sub assembly. The a multi-channel receiver optical sub assembly includes: a multi-channel PD array, in which a plurality of photodiodes (PDs) disposed on a first capacitor, and including receiving areas disposed at centers thereof and anode electrode pads arranged in an opposite direction at an angle of 180 degrees based on the receiving areas between the adjacent PDs is monolithically integrated; a plurality of transimpedance amplifiers (TIAs) arranged on a plurality of second capacitors, respectively, and connected with the anode pads of the respective PDs through wire bonding; a submount on which the first capacitor. | 03-05-2015 |