Abstract:
광 송신 장치가 개시된다. 광 송신 장치는 단일의 위상 변조기를 구비하여 제로 복귀(Return-to-zero) 및 차동 위상 편이(Differential Phase Shift Key)된 신호의 패턴과 위상 특성이 동일한 신호를 출력함을 특징으로 한다. 이에 의해 별도의 RZ 변조기를 사용하지 않고 RZ-DPSK 신호를 생성하는 것이 가능하다.
Abstract:
PURPOSE: A coherent optical receiving device for digital equalization of optical signal is provided to optimize an equalizer of the device regardless of color distribution value. CONSTITUTION: A coherent optical receiving device comprises: a chromatic dispersion compensation unit(126) for compensating color dispersion to digital signal corresponding to optical signal using a filter; a decoder for generating bit sequence to the compensated signal; a bit error calculator(132) for calculating bit error quantity to the bit sequence; and a control unit for setting determined filter coefficient.
Abstract:
PURPOSE: An optical coherent receiver and an optical signal processing method are provided to accurately estimate a frequency, thereby preventing influences of a distorted phase occurring an RZ pulse cover and compensating for the distorted phase. CONSTITUTION: A frequency offset compensating unit(370) estimates a frequency offset about at least one of even samples and odd samples which are inputted from a polarization demultiplexer. The frequency offset compensating unit compensates for the frequency offset of the even samples and odd samples using the estimated frequency offset. A cover distortion compensating unit(390) compensates for distorted phases of the samples whose frequency offsets are compensated for. The distorted phase is generated from a light transferring device.
Abstract:
본 발명은 파장분할 다중화(wavelength division multiplexing) 광 전송 기술이 구현된 광 네트워크에 관한 것으로, 타 노드로부터 광신호를 입력받는 다수의 입력단과 타 노드로 광신호를 전송하는 다수의 출력단을 포함하고, 상기 입력단들 중 하나로 입력된 광신호가 상기 출력단 들 중 하나의 출력단으로 출력되도록 경로를 스위칭하는 경로 스위칭부; 및 상기 입력단으로 입력된 광신호의 파장을 변환하여 상기 경로 스위칭부에서 스위칭 결과에 따라 상기 출력단으로 출력하는 파장 변환부; 를 포함하는 것을 특징으로 하는 광 회선 분배 장치에 의해 파장 충돌로 인해 네트워크 자원의 비효율적 사용을 막을 수 있고, 자동으로 회선 분배가 가능하여 빠른 경로 설정이 가능하며, 파장에 상관없이 광신호의 경로 스위칭 및 분기/결합이 가능하고 광신호를 방향에 관계없이 스위칭 가능하다는 효과가 있다. 회선 분배, 파장변환, 광통신망
Abstract:
PURPOSE: A channel allocation method of a transferring system for wavelength division multiplex method and an apparatus thereof are provided to supply in order to control interference between channels. CONSTITUTION: A plurality of light transmitters(800-1~800-N) processes an optical signal for transferring according to the fixed signal modulation method and a signal transferring speed. A channel assigning unit(810) obtains the signal modulation method and signal transferring speed information from a plurality of light transmitters. The channel assigning unit assigns the channel to the light transmitters with considering. The channel assigning unit assigns the channel to be adjacent a phase-modulated optical signals.
Abstract:
PURPOSE: An optical transmission device for outputting stable optical signal is provided to steadily control the phase difference between two MZ modulators of the QPSK(Quarternary Phase Shift Keying) light modulator and two arms at the same time. CONSTITUTION: An optical modulator(610) comprises parallel-connected Mach-Zehnder interferometer type of a first modulator(620) and a second modulator(630). The light modulator performs the QPSK(Quarternary Phase Shift Keying) modulation by inputting output optical signal of the light source(600). By controlling an bias respectively about the first modulator and the second modulator and the light modulator, a output stabilizer stabiles a finical output signal of the light modulator.
Abstract:
PURPOSE: An optical path distribution device in a wavelength division multiplexing system and a method for the same are provided to eliminate the requirement of signal wavelength presetting when an optical signal is branched/combined from each network node of the wavelength division multiplexing system to a local network. CONSTITUTION: A path switching unit(100) comprises input terminals(10-1~10-4) which receives optical signals from other node and output terminals(15-1~15-4) which transmits the optical signals to other node. The path switching unit switches a path so that an optical signal inputted to one among the input terminals is outputted to one output terminal. A wavelength converting unit(200) changes the wavelength of the optical signal inputted to the input terminal in order to output the result to the output terminal according to switching result. The path switching unit comprises a branch unit which amplifies, branches, and outputs the signal inputted to the connected input terminal and a signal selecting unit.
Abstract:
An optical network node device is provided to manage optical network efficiently by simultaneously processing transmission of small capacity and large quantity transmission of a wavelength channel. A plurality of 4-terminal ROADM(Reconfigurable Optical Add Drop Multiplexer)(700,710,720,730) passes or drops a WDM(Wavelength Division Multiplexing) channel, or adds the WDM to a WDM wavelength channel which passes an optically converted signal so as to pass them together. Optical transceivers perform photoelectric conversion to a signal dropped from a corresponding ROADM or optically convert an electric signal transmitted to a corresponding ROADM. A switch(780) redistributes transmission capacity, cross-connects the signals which are converted by the optical transceiver, switches the signals to one of optical transceivers corresponding to a direction in which the signal will pass and transmits the signals to a corresponding ROADM.
Abstract:
A photonic cross-connector system, a WDM(Wavelength Division Multiplexing) system using the same, and an optical communication network based on the same are provided to switch a single wavelength from an arbitrary input port to an output port, to implement an optical multicasting function, and to convert a deteriorated signal into a noise-cancelled, clean signal. A photonic cross-connector system comprises an optical coupler(100), a WSS(Wavelength Selective Switch), a WDM multicasting unit(300), an optical transceiver(400), and a circuit distributor control system(500). The optical coupler drops an inputted optical signal to many paths. The WSS extracts at least one wavelength signal from an inputted signal and outputs the extracted signal to at least one port. The WDM multicasting unit simultaneously reproduces and regenerates an inputted signal into a plurality of signals having different wavelengths. The optical transceiver executes a signal add-drop function, and the circuit distributor control system controls each of the units.
Abstract:
본 발명은 채널 출력 평탄화 기능을 가지는 광증폭 장치에 관한 것으로, 광신호를 증폭하는 광증폭기; 상기 광증폭기의 전방향과 후방향에서 상기 광신호를 펌핑하는 펌프부; 상기 광증폭기의 입력단으로 입력될 입력 광신호 중 일부에서 복수개의 특정 채널들을 선택하고, 상기 선택된 특정 채널들 각각에 대한 입력 광신호를 전기신호로 검출하는 제 1 검출부; 상기 광증폭기의 출력단에서 출력되는 출력 광신호 중 일부에서 상기 제 1 검출부에서 선택되는 채널들과 같은 복수개의 특정 채널들을 선택하고, 상기 선택된 특정 채널들 각각에 대한 출력 광신호를 전기신호로 검출하는 제 2 검출부; 및 상기 제 1 검출부 및 제 2 검출부에서 검출된 각각의 특정 채널들에 대한 전기신호를 입력받아 상기 각각의 특정 채널들에 대한 광신호 이득의 변화를 판단하고, 상기 광신호 이득 변화에 따라 이를 없애도록 상기 펌프부로 입력되는 인가 전류를 제어하는 제어부;로 구성되어, 자동 이득 제어, 자동 출력 광파워 레벨 제어 및 WDM 출력 평탄도를 유지할 수 있는 광증폭 장치를 제공할 수 있다.