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| 20100142571 | MULTIPLE DISTRIBUTED FEEDBACK LASER DEVICES - Provided is a multiple distributed feedback laser device. The laser device includes an active layer, a first diffraction grating, and a second diffraction grating. The substrate includes a first distributed feedback region, a modulation region, and a second distributed feedback region. The first diffraction grating is coupled to the active layer in the first distributed feedback region. The second diffraction grating is coupled to the active layer in the second distributed feedback region. In addition, the laser device includes a first micro heater and a second micro heater. The first micro heater supplies heat to the first diffraction grating. The second micro heater supplies heat to the second diffraction grating. The first micro heater and the second micro heater are controlled independently from each other. | 06-10-2010 |
| 20100142889 | WAVELENGTH TUNABLE OPTICAL INTERLEAVER - An optical interleaver of a wavelength division multiplexing (WDM) system includes an optical coupler, first and second waveguides, a high reflection mirror, and first and second phase shifters. The coupler divides an input optical signal. The first waveguide branches off from the coupler in a first direction. The second waveguide branches off from the coupler in a second direction for providing an optical path different from that provided by the first waveguide. The high reflection mirror is disposed at an end of the first waveguide for reflecting a first optical signal incident onto the first waveguide. The first phase shifter is disposed at an end of the second waveguide for multiple-reflecting a second optical signal incident onto the second waveguide. The second phase shifter is disposed at the first or second waveguide for adjusting an optical path difference between the first and second waveguides by varying its refractive index. | 06-10-2010 |
| 20100158524 | UPSTREAM SOURCE LIGHT GENERATOR OF PASSIVE OPTICAL NETWORK SYSTEM AND METHOD OF GENERATING UPSTREAM SOURCE LIGHT - Provided is an upstream source light generator of a passive optical network (PON) system. The upstream source light generator includes an amplification part configured to amplify injection light, and a reflection part configured to receive the amplified injection light and generate reflection light by reflecting the amplified injection light with different optical delays according to wavelengths of the amplified injection light. | 06-24-2010 |
| 20110002583 | OPTICAL DEVICE - Provided is an optical device. The optical device includes a multiplexer/demultiplexer, a multimode interference (MMI) coupler, a first waveguide, and second waveguides. The multiplexer/demultiplexer splits optical signals having a plurality of channels and received through a first port according to their wavelength to provide the split optical signals to second ports, or providing input optical signals having wavelengths difference from each other and received through the second ports to the first port. The multimode interference (MMI) coupler is connected to the first port. The first waveguide is connected to the MMI coupler. The second waveguides are connected to the second ports. The MMI coupler has a width decreasing toward the multiplexer/demultiplexer. | 01-06-2011 |
| 20110068270 | APPARATUS FOR GENERATING/DETECTING THZ WAVE AND METHOD OF MANUFACTURING THE SAME - Provided are an apparatus for generating/detecting terahertz wave and a method of manufacturing the same. The apparatus includes a substrate, a photo conductive layer, a first electrode and a second electrode, and a lens. The photo conductive layer is formed on an entire surface of the substrate. The first electrode and a second electrode are formed on the photo conductive layer. The first and second electrodes are spaced from each other by a certain gap. The lens is formed on the first and second electrodes. The lens is filled in the gap between the first and second electrodes. | 03-24-2011 |
| 20110149368 | PHOTOMIXER MODULE AND TERAHERTZ WAVE GENERATION METHOD THEREOF - Provided are a photomixer module and a method of generating a terahertz wave. The photomixer module includes a semiconductor optical amplifier amplifying incident laser light and a photomixer that is excited by the amplified laser light to generate a continuous terahertz wave. The photomixer is formed as a single module together with the semiconductor optical amplifier. | 06-23-2011 |
| 20110150018 | LASER DEVICE - Provided is a laser device. In the laser device, an active layer is connected to a stem core of a 1×2 splitter on a substrate, a first diffraction grating is coupled to a first twig core of the 1×2 splitter, and a second diffraction grating is coupled to a second twig core of the 1×2 splitter. An active layer-micro heater is designed to supply heat to the active layer. First and second micro heaters are designed to supply heats to the first and second diffraction gratings, respectively, thereby varying a Bragg wavelength. | 06-23-2011 |
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| 20090154923 | WAVELENGTH SELECTIVE SWITCH - Provided is a wavelength selective switch (WSS), and more particularly, a wavelength selective switch for electrically switching a wavelength without physical displacement. The wavelength selective switch includes an optical demultiplexer for dividing an input optical signal into signals having wavelengths corresponding to respective channels, selecting either the optical signal of each channel obtained by dividing the input optical signal or an optical signal input via an add port, and outputting the selected optical signal; and an optical multiplexer including an optical deflecting unit for individually deflecting the optical signals of the respective channels received from the optical demultiplexer according to supplied current or applied voltage, wherein the optical signal of each channel deflected by the optical deflecting unit is output to a specific output port. In the wavelength selective switch, current is supplied to the optical deflectors to switch the channels, resulting in higher reliability, smaller volume and higher switching speed than a conventional wavelength selective switch using mechanical displacement to switch channels. | 06-18-2009 |
| 20100158056 | SEMICONDUCTOR LASER DEVICE - Provided is a semiconductor laser device including: a gain area where multi-wavelength lights are generated and gain are provided; a first reflection area where among the multi-wavelength lights, a first-wavelength light is reflected to the gain area in response to a first selection signal; a second reflection area where among the multi-wavelength lights, a second-wavelength light is reflected to the gain area; and a phase control area where a phase of the second-wavelength light is shifted in response to a phase control signal, the phase control area being disposed between the first reflection layer and the second reflection layer. | 06-24-2010 |
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| 20100162276 | COMPOSITE SERVICE CONTROL SYSTEM USING EXPLICIT AND IMPLICIT CONFLICT RESOLUTION SCHEME - Disclosed is a composite service control system resolving a conflict, the system including a conflict set defining unit to classify and define an explicit conflict set and an implicit conflict set, a determining unit to determine an application triggering condition of a new application, and to determine whether an intersection between an explicit conflict set and an explicit conflict set exists and whether an intersection between an implicit conflict set and an implicit conflict set exists, an application managing unit to transmit the application triggering condition and execution information of the existing application and to request a defining of a conflict resolution policy or a changed application triggering condition and to store the application triggering condition and the execution information of the new application in an application information database, when the intersections do not exist or the conflict resolution policy has been defined, an explicit conflict processing unit to select an application to be executed from among the explicit conflict set according to the application triggering condition and the conflict resolution policy of each application which are stored in the application information database, and an implicit conflict processing unit to determine whether to execute or cancel an API in the implicit conflict set according to a conflict resolution policy when the API is called. | 06-24-2010 |
| 20110069004 | REMOTE CONTROLLER SUPPORTING SYSTEM AND METHOD FOR PROVIDING WEB SERVICE OPTIMIZED FOR REMOTE CONTROLLER - Provided is a remote controller supporting system and method that may provide a web service optimized for a remote controller of a user by displaying a webpage with different functions according to functions of each remote controller. The remote controller supporting system may include: a webpage storage unit to store a different webpage for each remote controller according to functions supportable by each remote controller; and a function controller to transmit remote controller group information containing remote controllers and webpage information corresponding to each of the remote controllers, and to transmit a webpage corresponding to a remote controller used in a system receiving the remote controller group information according to a request of the system. | 03-24-2011 |
| 20110154365 | METHOD FOR DETECTING AND CONTROLLING CONTENTION OF CONVERGENCE SERVICE BASED ON RESOURCE - Provided is a method for detecting and controlling a contention of a convergence service based on resources. The method may analyze a contention between a plurality of applications through modeling of the resources, messages, and applications, establish a resolution policy, and detect and control the contention between the plurality of applications using the established resolution policy. | 06-23-2011 |
| 20120166280 | METHOD AND SYSTEM FOR PROVIDING USER TAILORED SERVICE USING SOCIAL NETWORK SERVICE - Provided are a method and a system for providing a user tailored service using a social network service. The method includes at a user terminal, receiving a transaction approval message from a credit card company server when a customer uses a credit card, and obtaining purchase information of the customer based on the received transaction approval message, and forming a social network for sharing the purchase information of the customer with predetermined persons having a social relationship, wherein the predetermined persons include friends, family members, and colleagues of the customer. | 06-28-2012 |
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| 20090135828 | INTERNET PROTOCOL TELEVISION (IPTV) BROADCASTING SYSTEM WITH REDUCED DISPLAY DELAY DUE TO CHANNEL CHANGING, AND METHOD OF GENERATING AND USING ACCELERATION STREAM - An Internet Protocol Television (IPTV) broadcasting system is provided. The IPTV broadcasting system includes: An Internet Protocol Television (IPTV) broadcasting system for reducing a display delay when a channel is changed, including: a stream transmitting apparatus receiving a broadcast channel stream, generating an acceleration stream from the broadcast channel stream, and transmitting the broadcast channel stream and the acceleration stream; and a set-top box receiving the broadcast channel stream and the acceleration stream from the stream transmitting apparatus, and reproducing a decoding stream, according to a type of a received frame in the broadcast channel stream and the acceleration stream. Therefore, it is possible to reduce a display delay when a channel is changed. | 05-28-2009 |
| 20100138854 | METHOD AND SYSTEM FOR CONTROLLING RESTRICTION ON VIEWING MULTIMEDIA CONTENTS - There are provided a method and a system for controlling restriction on viewing multimedia contents. In the control of viewing multimedia contents through a terminal, contents transmitted to the terminal are restricted on a network according to a predetermined restriction condition to provide contents based on the user of the terminal. When it is required to change the restriction condition, the restriction condition can be remotely set and changed using a network for a specific user. Accordingly, restriction on viewing contents according to the user can be effectively controlled and the restriction condition can be effectively administrated to provide additional services. | 06-03-2010 |
| 20120124089 | USER INTEREST PATTERN MODELING SERVER AND METHOD FOR MODELING USER INTEREST PATTERN - A user interest pattern modeling server includes a history collection unit, a keyword extraction unit, a time pattern extraction unit, a keyword extension unit, a time pattern analysis unit and a pattern modeling unit. The history collection unit collects a user's use history of a content. The keyword extraction unit extracts a keyword from the use history of the content. The time pattern extraction unit extracts a first time pattern of the keyword. The keyword extension unit extracts an extended keyword through searching related words of the keyword. The time pattern analysis unit analyzes a second time pattern of the extended keyword based on the first time pattern. The pattern modeling unit models a user interest pattern for the keyword and the extended keyword based on the first and second time patterns. | 05-17-2012 |
| 20120164606 | APPARATUS AND METHOD FOR PROVIDING STORY MAKING SERVICE - Disclosed is a method for providing a story making service enabling multiple users to modify/change/rewrite contents, the method for providing a story making service includes: recommending and selecting the contents so as to help the users to select the contents performing the story making; determining a group to create or select the group using the story making together for the selected contents; generating and transmitting information necessary to provide services within the selected group; and reconfiguring a story to perform modification/change/rewriting works on the story within the selected contents and the selected service group. | 06-28-2012 |
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| 20080285978 | OPTICAL HYBRID MODULE - Provided is an optical hybrid module in which an optical device, a filter, an amplifier and an antenna are hybrid-integrated, which includes: a silicon optical bench disposed on a substrate and having an optical fiber and an optical device; an amplifier disposed on the substrate and connected to the optical device disposed on the silicon optical bench to amplify a signal transmitted from the optical device; and an antenna disposed on the substrate to be connected to the amplifier and transmitting a signal amplified by the amplifier. Thus, a foot-print module may be embodied by disposing an antenna and a filter on a single- or multi-layer substrate and providing a bias required for the optical device and the amplifier through a solder ball. Also, due to the antenna and filter disposed on the substrate, an expensive connector is not needed, and thus a production costs can be reduced. | 11-20-2008 |
| 20100133590 | SHARED PHOTODIODE IMAGE SENSOR - An image sensor with a shared photodiode is provided. The image sensor includes at least two unit pixels, each of which includes a photodiode, a diffusion region which gathers electrons from the photodiode, a transfer transistor which connects the photodiode with the diffusion region, and a readout circuit which reads out a signal from the diffusion region. Photodiodes of neighboring unit pixels are disposed symmetrically to be adjacent to one another to form a shared photodiode. The image sensor does not have a STI region which causes a dark current restricting its performance and does not require a basic minimum design factor (a distance or an area) related to a STI region. A region corresponding to a STI region may be used as a region of a photodiode or for additional pixel scaling. Therefore, a limitation in scaling of a photodiode is overcome, and pixel performance is improved in spite of pixel scaling. | 06-03-2010 |
| 20100140662 | OPTICAL RECEIVER AND METHOD OF FORMING THE SAME - Provided are an optical receiver and a method of forming the same. The optical receiver includes a lens, a photo detector, and a hetero-junction bipolar transistor. The lens is attached to a backside of a substrate. The photo detector is disposed on a top surface of the substrate. The hetero-junction bipolar transistor is disposed on the top surface of the substrate. The lens condenses an incident optical signal to transmit the condensed optical signal to the photo detector. | 06-10-2010 |
| 20100144123 | METHODS OF FORMING A COMPOUND SEMICONDUCTOR DEVICE INCLUDING A DIFFUSION REGION - Provided is a method of forming a compound semiconductor device. In the method, a dopant element layer is formed on an undoped compound semiconductor layer. An annealing process is performed to diffuse dopants in the dopant element layer into the undoped compound semiconductor layer, thereby forming a dopant diffusion region. A rapid cooling process is performed using liquid nitrogen with respect to the substrate having the dopant diffusion region. | 06-10-2010 |
| 20100246451 | Device and Method for Separation/Conversion of Multiband Signal - Provided are a method and device for separating and converting multiband signals. The device includes a photoelectric converter for converting an externally received optical signal into an electrical signal, a first switch for separating the converted electrical signal into signals according to frequency bands, a first mobile communication band-pass amplifier for amplifying a mobile communication network signal of the signals separated by the first switch, a broadband up-converter for up-converting a baseband signal of the signals separated by the first switch into a broadband signal, a first broadband amplifier for amplifying the broadband signal output from the broadband up-converter, and a transmitter for wirelessly transmitting the signals amplified by the first mobile communication band-pass amplifier and the first broadband amplifier. | 09-30-2010 |
| 20110140168 | AVALANCHE PHOTOTECTOR WITH INTEGRATED MICRO LENS - Provided is an avalanche photodetector with an integrated micro lens. The avalanche photodetector includes a light absorbing layer on a semiconductor substrate, an amplification layer on the light absorbing layer, a diffusion layer within the amplification layer, and the micro lens disposed corresponding to the diffusion layer. The micro lens includes a first refractive layer and a second refractive layer having a refractive index less than that of the first refractive layer. | 06-16-2011 |
| 20120156826 | METHOD OF FABRICATING AVALANCHE PHOTODIODE - A method includes: forming an epitaxy wafer by growing a light absorbing layer, a grading layer, an electric field buffer layer, and an amplifying layer on the front surface of a substrate in sequence; forming a diffusion control layer on the amplifying layer; forming a protective layer for protecting the diffusion control layer on the diffusion control layer; forming an etching part by etching from the protective layer to a predetermined depth of the amplifying layer; forming a first patterning part by patterning the protective layer; forming a junction region and a guardring region at the amplifying layer by diffusing a diffusion material to the etching part and the first patterning part; removing the diffusion control layer and the protective layer and forming a first electrode connected to the junction region on the amplifying layer; and forming a second electrode on the rear surface of the substrate. | 06-21-2012 |
| 20120162373 | DYNAMIC RANGE THREE-DIMENSIONAL IMAGE SYSTEM - Disclosed is a system of a dynamic range three-dimensional image, including: an optical detector including a gain control terminal capable of controlling an optical amplification gain; a pixel detecting module for detecting a pixel signal for configuring an image by receiving an output of the optical detector; a high dynamic range (HDR) generating module for acquiring a dynamic range image by generating a signal indicating a saturation degree of the pixel signal and combining the pixel signal based on the pixel signal detected by the pixel detecting module; and a gain control signal generating module generating an output signal for supplying required voltage to the gain control terminal of the optical detector based on the magnitude of the signal indicating the saturation degree of the pixel signal. | 06-28-2012 |
