Abstract:
본 발명은 광증폭기의 온도변화에 따른 이득 스펙트럼 보상장치, 방법 및 상기 장치를 구비한 장파장 대역 분산보상 하이브리드 광증폭기에 관한 것이다. 본 발명은, 2단 증폭구조를 갖는 광증폭기의 온도변화에 따른 이득 스펙트럼 보상장치에 있어서, 제1 증폭단 및 제2 증폭단 사이에 위치하여 상기 제1 증폭단에서 출력된 광신호의 분산을 보상하고, 입력되는 펌프광에 의해 상기 광신호의 라만 증폭을 수행하는 분산보상 광섬유(DCF); 상기 분산보상 광섬유(DCF)에 순방향 또는 역방향 펌프광을 제공하는 적어도 하나의 펌프광 제공수단; 상기 제1 증폭단 및 제2 증폭단의 온도변화를 각각 검출하는 제1 및 제2 온도검출수단; 및 상기 검출된 제1 증폭단 및 제2 증폭단의 온도 변화에 따라 상기 펌프광 제공수단의 펌프광의 세기를 조절하는 제어수단을 포함하여, 온도 변화에 따른 광증폭기의 이득 스펙트럼의 변화를 상기 펌프광의 세기를 조절하여 보상한다. 본 발명에 따르면, 광증폭기에서 분산보상 광섬유 펌프광의 세기만을 변화시켜 온도변화에 따른 이득 스펙트럼의 변화를 쉽게 보상하고, 부품 또는 회로의 추가 없이 분산보상 광섬유 펌프광의 세기를 변화시킬 수 있어 구현이 쉽고 경제적이다.
Abstract:
Disclosed herein is an inhomogeneity tunable erbium-doped optical fiber amplifier with a long wavelength band and method of blocking a backward amplified spontaneous light emission in the same. The optical fiber amplifier includes a control device situated between a first amplification stage and a second amplification stage for controlling an isolation rate of a backward amplified spontaneous light emission being propagated from a second amplification stage to the first amplification stage. The method blocks a backward amplified spontaneous light emission in a two-stage inhomogeneity tunable erbium-doped optical fiber amplifier with a long wavelength gain band, in which the backward amplified spontaneous light emission being propagated from a second amplification stage to a first amplification stage is blocked, and an isolation rate of the backward amplified spontaneous light emission is controlled according to the intensity of an optical signal inputted to the first amplification stage.
Abstract:
PURPOSE: A broadband optical link control apparatus is provided to restrain amplification characteristics change of an optical repeater by compensating a loss change of an optical transmission line and a loss spectrum change. CONSTITUTION: Pump lasers(211,213) with the same wavelength are coupled through polarization couplers(215,217) to obtain a high output pumping light and a gain independent on polarization. Pumping light sources of each wavelength are coupled to one optical fiber through a pump WDM coupler(218) and made incident on an optical transmission light connected to an optical connector(201) through a pump/signal WDM coupler(202), and then, the transmitting optical fiber is induced to Raman scattering. An output strength of the optical signal from the optical connector(206) is fixed by a value determined by a reference voltage(306). That is, the optical signal branched through a monitoring optical coupler(205) is converted to an electric signal, that is, a voltage, in an optical detector(301), and a difference value between the converted voltage and the reference voltage(306) is outputted from an attenuator(304), passes through an integrator(305), and is inputted to a variable optical attenuator(204). The variable optical attenuator(204) controls an attenuation rate in proportion to an output voltage of the integrator(305), so that the output strength of the optical signal transmitted to the optical connector(206) has a fixed value. A portion of the optical signal output which has passed through the pump/signal WDM coupler(202), an optical separator(203) and the optical attenuator(204) is outputted through the monitoring optical coupler(205).
Abstract:
1. 청구범위에 기재된 발명이 속한 기술분야 본 발명은 이득 고정 광증폭 장치에 관한 것임. 2. 발명이 해결하려고 하는 기술적 과제 본 발명은, 광증폭 장치의 입력단에 레이저 다이오드를 구비시키고, 상기 광증폭 장치의 출력을 광 궤환(Optical Feedback) 회로를 이용하여 다시 입력으로 되돌림으로써, 넓은 파장 대역을 가지는 입력 신호에 대해서도 일정한 이득을 얻을 수 있는, 이득 고정 광증폭 장치를 제공하고자 함. 3. 발명의 해결방법의 요지 본 발명은, 넓은 파장 대역을 갖는 입력 신호에 대해서도 일정한 이득을 얻을 수 있도록 하기 위한 이득 고정 광증폭 장치에 있어서, 외부로부터 입력받은 광신호의 채널 수와 상관없이, 일정한 세기로 제어된 신호를 제공하기 위한 신호 제어 수단; 상기 신호 제어 수단에 의해 일정한 세기로 제어된 신호를 제공받아 증폭하기 위한 신호 증폭 수단; 및 상기 신호 증폭 수단에 의해 증폭된 신호의 일부를 분기하여, 상기 신호 제어 수단에 의해 일정한 세기로 제어된 신호와 같이 상기 신호 증폭 수단의 입력 신호로 제공하기 위한 신호 궤환 수단을 포함함. 4. 발명의 중요한 용도 본 발명은 광전송 시스템 등에 이용됨.
Abstract:
PURPOSE: A device for gain fixing optical amplification is provided to obtain a constant gain about an input signal which has a wide wavelength band by preparing a laser diode at an input tap and operating an optical feedback circuit at an output tap. CONSTITUTION: A control unit(310) offers a signal which is controlled to a constant intensity regardless of a channel number of an optical signal inputted from outside. An amplification unit(320) amplifies the signal which is controlled to the constant intensity in the control unit(310). A feedback unit(330) divides the signal amplified in the amplification unit(320) and offers the divided signal to the amplification unit(320) with the signal controlled to the constant intensity in the control unit(310).
Abstract:
PURPOSE: A long wavelength band erbium-doped fiber amplifier and a backward amplified spontaneous emission intercepting method are provided to improve an input/output photo intensity change efficiency and noise factor feature by adjusting an intercepting rate of a backward amplified spontaneous emission. CONSTITUTION: A light signal is inputted to a first stage erbium-doped fiber(202). An output light signal amplified by a second stage erbium-doped fiber(203) is outputted through an IWDM photo coupler(204). A laser diode(205) provides an excited light to a TIWDM photo coupler(201). The TIWDM photo coupler(201) couples an input light signal and an exited light of 980 nm. An IWDM photo coupler(204) couples an output light signal and an exited light of 1480 nm. A controller is installed between the first and second stage erbium-doped fibers(202,203) and controls an intercepting rate of a backward amplified spontaneous emission. Two 3 port photo circulators(207,208) are connected between the first and second stage erbium-doped fibers(202,203) to each other in series.
Abstract:
잡음특성의 큰 변화없이 이득특성을 향상시킨 1530nm 파장대역의 여기광원으로 여기된 장파장대역 에르븀 첨가 광섬유 증폭기에 관한 것으로, 이를 위한 본 발명은 장파장대역의 광신호가 입력되는 입력단, 1530nm 파장대역의 여기광원을 여기시키는 여기부, 상기 여기 광원과 입력 광신호를 결합시켜주는 파장분할다중화결합기, 및 상기 여기광원에 의해 고에너지준위를 가진 반전상태에서 상기 입력 광신호를 증폭하는 에르븀첨가 광섬유를 포함하여 이루어지고, 상기 여기부는 상기 1530nm파장대역의 여기 광원이 입력신호광과 같은 방향인 순방향여기, 반대방향인 역방향여기, 순방향여기와 역방향여기를 함께 이용한 양방향여기 또는 2단 증폭구조중 어느 하나를 이용하는 것을 특징으로 한다.
Abstract:
PURPOSE: An optical fiber amplifying apparatus is to simplify a structure of a control circuit and reduce the number of optical taps, thereby maximizing an efficiency and a performance thereof. CONSTITUTION: The first optical amplifying unit(1001) generates a fixed output signal regardless of a strength variation of an input optical signal. A control unit(1004) controls a strength of the fixed output signal whose spectral gain profile is offset against that of the first optical amplifying unit according to the strength variation of the input optical signal. The second optical amplifying unit(1002) receives the output signal of the control unit and generates a fixed output signal whose spectral gain profile is offset against that of the first optical amplifying unit. The first optical amplifying unit and the second optical amplifying unit are operated under an output saturation state.
Abstract:
PURPOSE: A bidirectional spectral inverter is provided to compensate a chromatic dispersion and nonlinear phenomenon occurring in a bidirectional optical communication system by enabling a spectral inversion for both two signals inputted from two ways by using a single spectral inverter. CONSTITUTION: A waveguide type photocoupler(110) receives by both input terminals thereof an optical signal outputted from transmitters(101,127) positioned at both directions through optical fibers of each direction, generates a spectral inversion light, and outputs the spectral inversion light through both output terminals. Wavelength division multiplexers(103,109,124) receive signals outputted to two output terminals of the waveguide type photocoupler(110) and excited light supplied from an excitation light source after being divided into 1/2 through a Y-type branching filter and inputs them to nonlinear mediums(115,116). The nonlinear mediums(115,116) generate s fresh light signal component through the operation of the signal light and the excited light source inputted through the inter terminals by using a nonlinear phenomenon such as a 4-light wave mixture. Reflectors(117,118) changes proceeding direction of a spectral inversion light signal generated by the nonlinear mediums.