Abstract:
PURPOSE: An RSOA control method and a control device thereof are provided to keep constant optical property driving RSOA of ONU(Optical Network Unit) regardless of the wavelength of the seed light inserted in the OLT in loop back type WDM-PON based on RSOA. CONSTITUTION: A controller unit(10) controls the operating temperature activating the RSOA, and sets the threshold current in which the light source begins to erupt regardless of the wavelength of the seed light. An optical property control unit(20) controls the operating current in order to constantly control the light characteristic differently outputted by wavelength of the seed light inserted in RSOA. The optical property control unit comprises the current optical output information generator unit generating the current optical output information and the operating current setting unit setting the operating current which regularly controls the optical output characteristic.
Abstract:
PURPOSE: An optical receiver, a restoration method of a received signal and OLT are provided to increase extinction ratio of a downward optical signal to more than the constant level in a WDM-PON system based on a reflective semiconductor optical amplifier recycling the downward optical signal. CONSTITUTION: A photo diode(20) changes an optical signal into an electric signal and outputs it. A preamplifier unit(22) linearly amplifies the electric signal, and changes it into a voltage signal. A post-amplifier unit(25) capable of controlling the gain control, changes the voltage signal into the signal with the fixed output level, and controls the changed decision critical value. An offset voltage generator unit(28) produces the fixed offset voltage for the control of the decision critical value and provides it to the post-amplifier unit.
Abstract:
PURPOSE: An apparatus and a method for sharing a look-up table are provided to enable SFUs to efficiently share one look-up table, thereby reducing lowering of performance. CONSTITUTION: A bank dividing unit(210) divides a look-up table into a plurality of banks. The bank dividing unit forms an initial bitmap. A multi patch unit(220) extracts a current bitmap from the initial bitmap. The multi patch unit provides data of a corresponding bank for specified SFU(Special Function Unit)s specified in the current bitmap. A bitmap updater(230) presently forms the next bitmap by XOR(exclusive OR) operation of the initial bitmap and the current bitmap.
Abstract:
PURPOSE: An apparatus and a method for decoding a video using a multiprocessor are provided to perform video decoding by functional level division scheme and an application of data level division scheme thereby enhancing decoding performance. CONSTITUTION: A scheduler(120) schedules received bit data received through information of pre-parser(110) in a macro block unit. The scheduler respectively assigns scheduled macro blocks which are scheduled in data level and functional level to corresponding processor. A decoder(130) respectively decodes allocated macro blocks at the data level and the functional level. A frame memory(140) stores decoding result.
Abstract:
An optical transceiver module using a flat-plate type bidirectional light emitting and receiving element is provided to exclude expensive active alignment equipment for TO-CAN packaging by utilizing the flat-plate type bidirectional light emitting and receiving element capable of bidirectional communication only with a single optical fiber, and thus cutting down the manufacturing cost. An optical transceiver module is composed of a flat-plate type bidirectional light emitting and receiving element(110) formed by integrating light emitting and receiving elements with optical-to-electrical and electrical-to-optical conversion functions, on a single substrate; an optical fiber end treating unit(120) providing an optical interface passively aligned between one side of the flat-plate type bidirectional light emitting and receiving element and an optical fiber; and a PCB(Printed Circuit Board) substrate(130) electrically connected with the other side of the flat-plate type bidirectional light emitting and receiving element to secure a signal processing function.
Abstract:
본 발명은 별도의 온도 제어 부품의 사용 없이 외부 온도에 무관하게 출력 광파워와 출력 파장이 일정하게 유지될 수 있는 온도 무의존성 외부공진레이저를 제공한다. 그 외부공진레이저는 반도체 증폭기; 브라그 격자(Bragg Grating)가 형성된 코어 및 상기 코어를 감싸는 클래드를 구비한 광섬유; 및 광섬유를 페룰(ferrule)에 고정하고 음의 열광학 계수를 갖는 열경화성 폴리머;를 포함하고, 브라그 격자가 형성된 부분의 코어를 감싸는 클래드의 두께가 다른 부분의 클래드보다 얇게 형성되며, 상기 열경화성 폴리머가 상기 클래드를 감싸고 있다. 본 발명의 외부공진레이저는 별도의 온도 제어 장치를 부착할 필요가 없어서, 소형 및 저가형으로 제작할 수 있기 때문에, 경제적인 WDM 광가입자망 설계에 있어서, DWDM 시스템 광원으로 유용하게 사용될 수 있다. 외부온도 무의존 광원, 외부공진레이저, thin-film 필터, 브라그 격자
Abstract:
An optical transceiver module using an RSOA(Reflective Semiconductor Optical Amplifier), a PON(Passive Optical Network) having the same, and a method for detecting input optical power therein are provided to enable each ONT(Optical Network Terminal) or a CO(Central Office) to rapidly confirm the optical power of a downstream optical signal inputted to an RSOA and to guarantee reliability in operating a WDM(Wavelength Division Multiplexing)-PON by confirming operation state of the optical transmitter of each ONT. An optical transceiver module(100) in a PON comprising a CO and ONTs comprises an optical receiver(120), an RSOA(111), and an optical power detector(130). The optical receiver(120) receives a downstream optical signal from the CO. The RSOA(111) receives the downstream optical signal, modulates it into an upstream optical signal again, and transmits it. The optical power detector(130) detects the optical power of the downstream optical signal inputted to the RSOA(111).
Abstract:
본 발명은 실리콘 광 벤치형 발광 및 수광 서브 어셈블리(TOSA, ROSA) 및 이를 이용한 광송수신 집적 모듈에 관한 것이다. 상기 목적을 달성하기 위한 본 발명에 따른 실리콘 광 벤치형 광 서브 에셈블리는, 내부에 광섬유를 갖는 광섬유 페룰; 광신호를 전기신호 또는 전기신호를 광신호로 변환하기 위한 광소자 칩과, 상기 광소자 칩에 상기 광소자 페룰의 광섬유가 광학적으로 연결될 수 있도록 상기 광섬유를 배열하기 위한 홈을 갖는 실리콘 광 벤치형 광 소자; 상기 페룰과 상기 실리콘 광 벤치형 광 소자를 각각 실장하기 위한 오목한 실장부를 갖는 지지대; 및 상기 지지대에 연결되고, 외부 광섬유를 고정하여 상기 페룰의 광섬유와 광학적으로 연결하기 위한 광 어댑터를 포함하는 것을 특징으로 한다. 실리콘 광 벤치, 광송수신 집적 모듈, TOSA, ROSA
Abstract:
본 발명은 광섬유 브라그 격자가 광결합부에 내장되어 있는 광섬유 커플러의 패키지에 관한 것이다. 본 발명에 따른 광섬유 브라그 격자가 광결합부에 내장된 광섬유 커플러의 패키지는, 상기 광섬유 커플러가 장착되는 기판과, 상기 기판에 상기 광섬유 커플러를 고정하기 위한 고정 수단과, 상기 기판 상부에 배치되며 상기 광섬유 커플러를 보호하기 위하여 상기 광섬유 커플러를 둘러싸는 'ㄷ'형상의 제1 튜브를 포함하는 것을 특징으로 한다. 또한 상기 패키지는 외부로부터의 충격을 방지하기 위하여 상기 제1 튜브가 삽입되는 제2 튜브와, 튜브에 외부 물질의 유입을 방지하기 위한 밀폐 수단을 더 포함할 수 있다. 광섬유 브라그 격자, 광결합부, 광섬유 커플러, 패키지, 석영 튜브, 용융-인장 공정
Abstract:
Disclosed herein is an apparatus and method for managing faults of a loop-back Wavelength Division Multiplexing Passive Optical Network (WDM-PON). The apparatus includes a control light source as well as a plurality of light sources in a central office, a loop-back means for transmitting control light to the central office through a remote node optical demultiplexer or remote node optical multiplexer in a remote node, a control light receiver for receiving looped-back control light, and a control unit for maintaining power of the upstream signals, which are received by central office receivers, and power of the control light, which is received by the control light receiver, at a maximum.