Abstract:
본 발명은 채널당 출력이 일정한 파장분할다중화 광섬유증폭기에 관한 것으로, 복수의 채널이 다중화되어 입력되는 광신호를 증폭하는 파장분할다중화 광섬유증폭기에 있어서, 제1제어값에 따라 그 파워가 조절되는 더미(dummy) 광을 생성하여 입력 광신호와 결합시켜서 입력 광신호의 파워를 조절하는 파워 조절부; 제2제어값에 따라 생성되는 펌핑광에 의해 파워가 조절된 광신호를 증폭하는 광섬유증폭부; 및 입력 광신호의 파워와 소정 목표 파워값과의 차에 해당하는 더미 광 파워를 얻도록 제1제어값을 파워 조절부에 공급하고, 입력 광신호의 증폭에 필요한 펌핑광 파워를 얻도록 제2제어값을 광섬유증폭부에 공급하는 제어부를 포함함을 특징으로한다. 본 발명에 의하면, 복수의 채널이 다중화되어 증폭되는 파장분할 광섬유증폭기에 있어서 채널이 결합/분리되어 입사하는 광신호의 파워를 조절함으로써 광섬유증폭기의 과도현상을 제거할 수 있다.
Abstract:
PURPOSE: A method is provided to be capable of improving a coupling efficiency of an optical signal by using a thermally expanded optical fiber. CONSTITUTION: The first optical fiber(210) has a relatively small clad outer diameter, and the second optical fiber(220) has a relatively large clad outer diameter. The first and second optical fibers(210, 220) are connected using an arc fusion splicer. A clad portion of the first optical fiber(210) is widened, and thus is coupled with a clad portion of the second optical fiber(220). As the clad portion of the first optical fiber is widened, a core portion thereof is also widened. The core portion thus widened has a relatively wide area.
Abstract:
PURPOSE: An attenuator using an isolator and an optical communication system having the attenuator are provided to perform a function regardless of variation of a surroundings by controlling a current applied to a coil of the isolator. CONSTITUTION: When an input optical signal is inputted through an input terminal of an optical fiber, an isolator(300) isolates the input optical signal. Because an electric signal generated by a source supplier(302) varies an electromagnetic field, an isolation degree of the isolator(300) is varied. Namely, the electric signal is applied to a magnetic core(304) and a coil(306), and the input optical signal is attenuated according to the isolation degree of the isolator(300). At this time, the magnetic core(304) is for increasing a magnetic flux.
Abstract:
PURPOSE: An optical fiber amplifier is provided to be capable of obtaining a constant gain regardless of a variation of a channel number or of an input signal per a channel. CONSTITUTION: An optical fiber amplifier comprises an input optical signal separating part(200) which separates an input optical signal power detection signal for detecting the strength of an input optical signal and a transfer optical signal for transferring an optical signal from an inputted optical signal. An optical signal amplifier(210) amplifies the transfer optical signal from the input optical signal separating part(200) in response to a control signal. An output optical signal separating part(220) separates an output optical signal power detection signal for detecting the strength of the transfer optical signal and an optical signal, from the transfer optical signal from the optical signal amplifier(210). An optical signal gain controller(230) calculates the strength of the inputted optical signal from the input power detection signal, and calculates the strength of the output optical signal using previously stored gain information and the calculated strength of the input optical signal.
Abstract:
PURPOSE: A WDM(Wavelength-Division Multiplexed) EDFA(Erbium Doped Fiber Amplifier) having a constant output power in an optical relay system is provided to install a bidirectionally-accessible storage and a corresponding controller, to store a target value of a parameter necessary for an operation of the EDFA, and to compare the stored value with the operation of the present EDFA, to drive the EDFA. Therefore, data bottleneck and data collision can be avoided. CONSTITUTION: The first storage stores a target output power of a WDM(Wavelength-Division Multiplexed) EDFA(Erbium Doped Fiber Amplifier)(130) in accordance with the number of each channel of an inputted optical signal. A relay system controller(120) senses the number of channels of the optical signal inputted to the present WDM EDFA(130), and transmits the number of the channels of the WDM EDFA(130) to a next optical relay system. The second storage stores the number of the sensed channels. An amplification controller(134) reads the stored target value, to make the output power of the present WDM EDFA(130) regularly reach the target value, and stores the read target value in the second storage. The amplification controller(134) compares an amplification output power of the present WDM EDFA(130) with the stored target output power, and decides a driving value of a pumping light source(132).
Abstract:
PURPOSE: An optical fiber amplifier with long wavelength is provided to diminish the number of pump light sources and optical elements by using a reflecting body for reflecting Amplified Spontaneous Emission(ASE) when amplifying an input fiber signal of a long wavelength. CONSTITUTION: The optical fiber amplifier with long wavelength comprises: an Erbium Doped optical Fiber(EDF)(250) for amplifying an input signal with a long wavelength about 1580nm by a pump light; a pumping portion located at the front and rear direction of the EDF to supply the pump light to the EDF; and an ASE reflecting portion located at a front end of the EDF and the pumping portion, and combining ASE emitted from the EDF and the input signal with a long wavelength to output it to the EDF.
Abstract:
본 발명은 광중계 시스템에서 출력파워가 일정한 파장분할다중화 광섬유증폭기 및 이를 이루기위한 방법에 관한 것으로, 광중계 시스템에서 출력파워가 일정한 파장분할다중화 광섬유증폭기는 펌핑광원에서 출력되는 펌핑광을 이용하여 입력되는 다채널 광신호를 증폭하는 복수의 파장분할다중화 광섬유증폭기를 구비하는 광중계 시스템에 있어서, 입력되는 광신호의 각 채널 수에 따른 파장분할다중화 광섬유증폭기의 목표 출력파워를 저장하는 제1저장부; 현재 파장분할다중화 광섬유증폭기에 입력되는 광신호의 채널 수를 감지하고, 현재 파장분할다중화 광섬유증폭기의 채널 수를 다음 광중계 시스템으로 전송하는 중계 시스템 제어부; 중계 시스템 제어부에 의해 감지된 채널 수가 저장되는 제2저장부; 현재 파장분할다중화 광섬유증폭기의 출력파워가 목표값에 일정하게 도달하도록하기위해 제1저장부에 저장된 목표값을 읽어서 제2저장부에 저장하고, 현재 파장분할다중화 광섬유증폭기의 증폭 출력파워를 제2저장부에 저장된 목표 출력파워와 비교하여 펌핑광원의 구동값을 결정하는 증폭 제어부를 포함한다. 본 발명에 의하면, 광섬유 증폭기의 구동에 있어서 데이터의 병목현상이나 데이터 충돌을 피할 수 있다.
Abstract:
본 발명은 광섬유 증폭기에 관한 것으로, 어븀 및 인이 첨가된 제1광섬유;제1광섬유의 일단에 연결되고, 어븀 및 알루미늄이 첨가되어, 어븀의 밀도반전에 따라 제1광섬유와 반대의 이득 스펙트럼 기울기를 갖는 제2광섬유; 제1광섬유의 타단에 연결되어 제1 및 제2광섬유의 어븀을 여기시켜 신호광을 증폭하는 펌핑광원; 및펌핑광원의 펌핑광과 신호광을 결합하여 제1광섬유로 출력하는 광결합기를 포함한다. 본 발명에 의하면, 이득 스펙트럼이 다른 두 종류의 EDF를 사용하므로써 입력되는 신호광의 세기나 펌프광의 세기가 달라져도 그에 따른 각 EDF의 이득 스펙트럼도 능동적으로 변하므로 전체적으로 이득평탄을 유지할 수 있다.
Abstract:
An optical add-drop multiplexer (OADM) for adding and dropping wavelength groups for each node among multiplexed and input wavelength groups includes: a wavelength group demultiplexer for separating a plurality of input channels into groups of channels and dropping a channel group required for the node and passing the other groups of channels therethrough; a channel selector for selecting channels from the wavelength group output from the wavelength group demultiplexer and transmitting the selected channels to the area; a channel multiplexer for multiplexing the channels having the same wavelengths as those of the selected channels and input from the area into the wavelength group, and a wavelength group multiplexer for adding the wavelength group input from the channel multiplexer to the wavelength groups that have passed through the wavelength group demultiplexer. Wavelengths required for each node are set to a wavelength group, thereby reducing the time necessary in extending channel capacity or wavelengths in each node. Also, since only a channel selector is additionally installed in an OADM for wavelength extension, wavelength extension is facilitated and a WDM system can be constructed at a low cost. Such an OADM may be used in a wavelength division multiplexing (WDM) optical link.