Abstract:
본 발명은 광 스위치의 오동작을 감시하기 위한 방법 및 장치에 관한 것으로, 구체적으로는 펄스 형태의 감시광을 사용하여 광 스위치의 오동작 발생여부를 판단하는 장치 및 방법에 관한 것이다. 본 발명의 광 스위치 오동작 발생여부 판단장치는 전송될 데이터가 실려있는 신호광과는 별개로 광 스위치의 복수의 입력포트에 입력될 복수의 펄스 형태의 감시광을 생성하는 펄스 감시광 생성부; 상기 감시광을 상기 전송될 데이터가 실려있는 신호광과 광학적으로 합파하여 상기 광 스위치로 입력하는 합파수단; 상기 광 스위치에서 출력되는 출력 광신호에서 상기 감시광을 분파하는 분파수단; 상기 분파된 감시광을 검출하는 복수의 광 검출기; 및 상기 검출된 감시광과 상기 광 스위치의 입출력포트에 관한 연결설정정보를 비교하여 그 일치여부에 따라서 상기 광 스위치의 오동작 여부를 판단하는 오동작 여부 판단부로 구성된다. 본 발명의 광 스위치 오동작 발생여부 판단장치는 전송 품질에 아무런 영향을 미치지 않으면서도 광 스위치를 감시할 수 있는 효과가 있으며, 부가적으로 필요한 광 모듈이나 전자회로가 간단하여 시스템에 실제로 쉽게 적용할 수 있는 장점이 있다.
Abstract:
본 발명에 따른 버스트 모드 광수신기의 입력 광세기 자동 제어 장치는, 입력 광신호를 동일한 신호인 제 1 광신호와 제 2 광신호로 분기하는 광파워 분배기와; 상기 광파워 분배기에서 분기한 상기 제 1 광신호를 광세기에 비례하는 전기신호로 변환하여 입력 광신호의 세기를 검출하는 신호처리부; 상기 광파워 분배기에서 분기된 상기 제 2 광신호를 일정시간 동안 지연시키는 광섬유 지연 라인; 및 상기 신호처리부에서 검출된 입력 광세기에 따라 감쇄크기를 조정하는 가변 광감쇄부를 포함한다. 이 같은 본 발명에 의하면, 버스트 모드 광수신기로 입력되는 광신호의 크기를 광학적인 방법으로 일정하게 만들어 줌으로써 고속으로 자동이득제어 기능을 수행해야 하는 전기회로부를 필요로 하지 않게 되므로 전기적 신호처리 기능의 단순화 및 속도 향상의 효과가 기대된다.
Abstract:
PURPOSE: A burst mode optical receiver is provided to control a received burst mode optical signal in predetermined size, and to configure a device only that converts a clock into a data signal by restoring the clock, thereby reducing a signal processing time and simplifying an electric circuit. CONSTITUTION: An optical power distributor(210) branches an inputted optical signal into the first optical signal and the second optical signal. An FDL(Fiber Delay Line)(220) delays the second optical signal for a predetermined time. A variable optical attenuator(230) controls attenuation size according to an input optical strength. A PD(Photo Diode)(280) converts the first optical signal into an electric signal. A TIA(Trans-Impedance Amplifier)(270) amplifies the converted electric signal. An ADC(Analog to Digital Converter)(260) converts the amplified electric signal into a digital signal.
Abstract:
PURPOSE: A method and an apparatus for detecting malfunction of an optical switch by sensing an output change of the optical switch are provided to determine malfunction of an optical switch by detecting an output change of a monitoring light and comparing it with switching information. CONSTITUTION: A monitoring light to be inputted to a plurality of input ports of an optical switch is generated(S710). The monitoring light is optically added with a signal light bearing data to be transmitted and inputted to the optical switch(S720). the monitoring light is split from an optical signal outputted from the optical switch and detected(S730). The output change of the detected monitoring light is compared with the set information of the optical switch, and then whether or not the optical switch is malfunctioned is determined based on the result of the comparison(740).
Abstract:
PURPOSE: A method and an apparatus for monitoring a wrong operation of an optical switch through sequential pulse input is provided to sequentially input pulse-type supervisory lights to the input ports of an optical switch, to detect the supervisory lights through the output ports, and to compare the output strength information of the detected supervisory lights with switching information in order to judge whether a wrong operation has been generated in the optical switch. CONSTITUTION: An apparatus for detecting a wrong operation in an NxM optical switch(100) using a 1xN switch consists of a supervisory light source creation part(110), a 1xN optical switch(120), the first WDM coupler(130), the second WDM coupler(140), an optical detector(150), a wrong operation judgment part(160), an error signal creation part(170), and an optical switch controller(180). The supervisory light source creation part(110) creates supervisory lights to monitor a wrong operation of the NxM optical switch(100). The created supervisory lights are inputted to the input ports of the 1xN optical switch(120). The 1xN optical switch(120) switches the inputted supervisory lights sequentially and outputs pulse-type optical signals having time differences respectively. The supervisory lights, outputted from the output ports of the 1xN optical switch(120), are optically connected to the input optical fiber of the NxM optical switch(100) through the first WDM coupler(130) respectively. The second WDM coupler(140) branches the inputted supervisory lights respectively. The branched supervisory lights are detected through the optical detector(150). The wrong operation judgment part(160) compares the detected supervisory lights with optical switch setting information, received from the optical switch controller(180).
Abstract:
PURPOSE: An automatically gain controlled optical fiber amplifier is provided to improve an operating speed by respectively controlling gains of each channel in real time. CONSTITUTION: An automatically gain controlled optical fiber amplifier comprises a first optical tap(301) partially dividing an input signal, a second optical tap(302) partially dividing an output signal, an 1x2 optical coupler(303) distributing the output of the first optical tap(301) to a signal processor(330) and a first wavelength selecting filter(321), the first wavelength selecting filter(321) separating an arbitrary channel signal from a partial signal of the output signal of the 1x2 optical coupler(303), a second wavelength selecting filter(322) separating an arbitrary channel signal from a partial signal of the output of the second optical tap(302), the signal processor(330) measuring all input signal intensity and the number of input channel by receiving signals from the 1x2 optical coupler(303) and the wavelength selecting filters(321,322), a controller(340) generating controlling signals according to the result of the signal processor(330), an optical amplifying and attenuating part(310) supplying signals to the second optical tap(302) according to the controller(340).
Abstract:
PURPOSE: A bidirectional optical dropper-inserter is provided to drop and insert an optical signal of a specific node in a bidirectional optical transmission system. CONSTITUTION: Circulators(211-214) divide a wavelength-multiplexed optical signal to be progressed in one direction and a wavelength-multiplexed optical signal to be progressed in the other direction. Optical amplifiers(221-224) amplify the strength of the wavelength-multiplexed optical signals divided through the circulators(211-214). Optical droppers(231,232) drop the optical signals with selection wavelengths of the wavelength-multiplexed optical signals received from the optical amplifiers(221-224). Inserting filters(271,272) reflect the optical signals with non-selection wavelengths penetrated through the optical droppers(231,232) and penetrate insertion optical signals inputted to an opposite direction. An optical isolators(281,282) remove the optical noise of the optical signals which are not reflected in the inserting filters(271,272) among the optical signals with the non-selection wavelengths penetrated through the optical droppers(231,232).
Abstract:
PURPOSE: An apparatus and a method for modulating optical intensity are provided to restrain amplitude noise generated due to a pilot signal by offsetting a signal component causing errors while maintaining a signal component required for adjusting bias voltage. CONSTITUTION: A pilot signal generator(21) generates a pilot signal for adjusting bias voltage. A phase delay(22) changes the phase of the pilot signal to delay the phase. A linear modulator receives the phase-delayed signal and an external optical signal and linearly modulates the signals. A signal adder(24) adds up a data signal and the pilot signal. An optical intensity modulator(25) receives a negative feedback signal to control bias voltage and accepts the signal added up by the signal adder and the linearly modulated signal to modulate optical intensity. A photo detector(26) detects a part of the optical signal transmitted through the optical intensity modulator to convert the detected signal into an electric signal. A frequency level measurement unit receives the electric signal and the pilot signal to measure the magnitude of frequency components of the signals to generate the negative feedback signal and sends the negative feedback signal to the optical intensity modulator.
Abstract:
PURPOSE: An optical add-drop multiplexer for a Wave Division Multiple optical telecommunications system is provided to vary optical add-drop channels at random, improve the flexibility. CONSTITUTION: In an optical add-drop multiplexer, a first optical coupler(220) divides wave division multiple(WDM) optical signals and sends the divided signals to a first output port(222) and a second output port(223). A fiber bragg grating(241) reflects partial waves of the divided optical signals from the first output port(222) of the first optical coupler(220) and sends the waves to a third output port(224) of the first optical coupler(220). An optical wave combiner produces other optical channels and combines the newly produced channels. A second optical coupler(230) couples the optical signal from the fiber bragg grating(241) and the combined optical channels from the optical wave combiner. A first optical wave selector/divider selects parts of the optical signal from the second output port(223) of the first optical coupler(220) and produces the selected waves as the output. A second optical wave selector/divider selects parts of the optical signal from the third output port(224) of the first optical coupler(220) and produces the selected waves as the output.
Abstract:
1. 청구범위에 기재된 발명이 속하는 기술분야 본 발명은 계층구조 셀룰라 시스템에서 이동국의 속도와 호의 종류에 따라 서비스받는 셀 계층과 채널을 할당하는 호처리 방법에 관한 것임. 것임. 2. 발명이 해결하고자 하는 기술적 과제 본 발명은 계층구조 셀룰라 시스템에서의 멀티미디어 호 처리 방법 및 그를 실현시키기 위한 프로그램을 기록한 컴퓨터로 읽을 수 있는 기록 매체를 제공하는데 그 목적이 있음. 3. 발명의 해결 방법의 요지 본 발명은 계층구조 셀룰라 시스템에서의 호를 처리하는 방법에 있어서, 지연에 민감하지 않은 데이터호에 대하여 채널을 할당하는 제 1 단계; 신규음성호와 지연에 민감한 신규데이터호에 대하여 호를 봉쇄하는 제 2 단계; 및 핸드오프음성호와 지연에 민감한 핸드오프 데이터호에 대하여 채널을 할당하는 제 3 단계를 포함함. 4. 발명의 중요한 용도 본 발명은 계층구조 셀룰라 시스템에서의 멀티미디어 호 처리에 이용됨.