公开(公告)号：KR1020050033667A

公开(公告)日：2005-04-13

申请号：KR1020030069453

申请日：2003-10-07

Applicant: 한국과학기술원

Inventor： 이창희 ,  백진석

IPC: G02B6/42

Abstract: A polarization-independent bidirectional optical transmission module is provided to fabricate a light source having excellent performance by removing polarization dependence on an external light source. A ferrule and a lens are coupled to an external optical fiber. A SWP(Spatial Walkoff Prism), a PBS(Polarization Beam Splitter), and a PMC(Polarization Maintained Coupler) are arranged on an optical signal path. One of the SWP, the PBS, and the PMC is used for splitting an optical signal received through the external optical fiber into two optical signals by polarization. A WDM filter is arranged in each of polarization paths. An optical receiver is arranged in a reception band path of outputs of the WDM filter. A light source is arranged in one of transmission band paths of outputs of the WDM filter.

Abstract translation: 提供了一种偏振无关的双向光传输模块，通过去除对外部光源的偏振依赖性来制造具有优异性能的光源。 套圈和透镜耦合到外部光纤。 在光信号路径上布置了SWP（空间散射棱镜），PBS（偏振光束分离器）和PMC（偏振维持耦合器）。 其中一个SWP，PBS和PMC用于将通过外部光纤接收的光信号通过极化分解成两个光信号。 在每个偏振路径中布置WDM滤波器。 光接收机布置在WDM滤波器的输出的接收频带路径中。 光源被布置在WDM滤波器的输出的一个传输带路径中。

公开(公告)号：KR1020050029610A

公开(公告)日：2005-03-28

申请号：KR1020030065956

申请日：2003-09-23

Applicant: 한국과학기술원

Inventor： 이창희 ,  홍광표 ,  백진석 ,  김성만 ,  이상묵 ,  문실구

IPC: H04B10/25 ,  H04B10/2581

CPC classification number: H04B10/40

Abstract: An ONT(Optical Network Terminator) and a method thereof are provided to continue a voice service with a low power when a power supply is interrupted owing to a power failure, and to minimize power consumption by modulating a Fabry-Perot laser diode into a forward bias or a reverse bias, thereby extending a communication time. An optical WDM(24) receives an optical signal and a non-interference type light source to output the received signal and the light source. A photo detector(22) converts a downstream high-speed optical signal and a low-speed optical signal into electric signals, respectively. A laser diode(10) converts an upstream signal into an optical signal. A high-speed driver(14) drives the laser diode(10) with the upstream signal to realize data and video channels, and transmits the data and video channels to the WDM(24). A high-speed receiver(16) receives downstream data and video channels. A charger(26) charges a received power, and outputs the charged power during a power failure. A low-speed driver(18) realizes a voice channel by reversely biasing the laser diode(10), and transmits the voice channel to a central station. A low-speed receiver(20) receives the voice channel.

Abstract translation: 提供ONT（光网络终端器）及其方法，用于在由于电源故障中断电源时继续以低功率的语音服务，并且通过将法布里 - 珀罗激光二极管调制到前端来最小化功耗 偏置或反向偏置，从而延长通信时间。 光学WDM（24）接收光信号和非干涉型光源，以输出接收的信号和光源。 光检测器（22）将下行高速光信号和低速光信号分别转换为电信号。 激光二极管（10）将上行信号转换为光信号。 高速驱动器（14）利用上行信号驱动激光二极管（10），实现数据和视频通道，并将数据和视频通道发送到WDM（24）。 高速接收器（16）接收下行数据和视频信道。 充电器（26）对接收到的电力进行充电，并在断电期间输出充电电力。 低速驱动器（18）通过反向偏置激光二极管（10）实现语音通道，并将语音信道发送到中心站。 低速接收机（20）接收语音信道。

公开(公告)号：KR1020040054315A

公开(公告)日：2004-06-25

申请号：KR1020020081338

申请日：2002-12-18

Applicant: 한국과학기술원

Inventor： 이창희 ,  박성범

IPC: H04B10/2507 ,  H04B10/2581

CPC classification number: H04J14/021 ,  G02B6/29395 ,  H04J14/0209

Abstract: PURPOSE: A direct modulation type wireless WDM(Wavelength Division Multiplex) system according to an optical filter detuning method is provided to effectively restrain chirping and a penalty due to an extinction ratio. CONSTITUTION: Multiple LDs(Laser Diode) directly modulate light signals by a laser driver. A multiplexer multiplexes light signals received from the multiple LDs and performs optical filter detuning thereon. A booster amplifier amplifies a detuned output received from the multiplexer to a suitable strength. An optical fiber receives an output from the booster amplifier and transfers a light signal. An in-line amplifier amplifies a light signal which has been reduced at a node installed at a specific point of the optical fiber. An ADM(Add/Drop Multiplexer) adds/drops a specific wavelength signal at the node installed at the specific point of the optical fiber and performs optical filter detuning thereon. A demultiplexer demultiplexes the light signal received from the optical fiber and performs optical filter detuning thereon.

Abstract translation: 目的：提供一种根据光学滤波器失谐方法的直接调制型无线WDM（波分复用）​​系统，以有效抑制啁啾和由于消光比造成的惩罚。 构成：多个LD（激光二极管）通过激光驱动器直接调制光信号。 复用器多路复用从多个LD接收的光信号，并在其上执行滤光器失谐。 升压放大器将从多路复用器接收的失谐输出放大到合​​适的强度。 光纤接收来自升压放大器的输出并传送光信号。 在线放大器放大在光纤的特定点处安装的节点处已经减少的光信号。 ADM（加/减多路复用器）在安装在光纤特定点处的节点处添加/删除特定波长信号，并在其上执行滤光器失谐。 解复用器对从光纤接收的光信号进行解复用，并对其进行滤光器失谐。

公开(公告)号：KR100387288B1

公开(公告)日：2003-06-18

申请号：KR1020010002468

申请日：2001-01-16

Applicant: 한국과학기술원

Inventor： 이창희 ,  추광욱 ,  이상묵

IPC: H04B10/07 ,  H04B10/2581

Abstract: PURPOSE: An apparatus for measuring a wavelength of an optical signal, an optical strength and an optical signal-to-noise ratio in a wavelength division multiplexing optical communication is provided to heighten an accuracy in measuring an optical strength and optical signal-to-noise ratio by measuring them by using a signal-band reflection optical filter. CONSTITUTION: An optical amplifier(502) receives a wavelength division-multiplexed optical signal, amplifies it and outputs it together with a spontaneous emission light. As a band pass optical variable filter(506), a Fabry-Perot variable filter, an integrated optical device containing grid, a multi-layer thin film device, or an acousto-optic filter may be adopted. An optical circulator(508) includes three input/output terminals, of which input and output correspond clockwise. That is, when a light is inputted to an arbitrary terminal, it is output to the next terminal clockwise. An optical fiber Bragg grids(510,512) reflect a light corresponding to a grid period and pass a light of the remaining wavelength. In addition, the optical fiber Bragg grids(510,512) reflect only a particular wavelength component of the spontaneous emission light and outputs a spontaneous emission light discrimination signal.

Abstract translation: 目的：提供一种在波分复用光通信中测量光信号的波长，光强度和光信噪比的装置，以提高测量光强度和光信噪比的准确性 通过使用信号带反射光学滤波器来测量它们。 构成：光放大器（502）接收波分复用光信号，将其放大并与自发发射光一起输出。 作为带通光学可变滤波器（506），可以采用法布里 - 珀罗可变滤波器，包含网格的集成光学器件，多层薄膜器件或声光滤波器。 光环行器（508）包括三个输入/输出端子，其输入和输出顺时针对应。 也就是说，当光输入到任意端子时，它顺时针输出到下一个端子。 光纤布拉格栅格（510,512）反射对应于栅格周期的光并通过剩余波长的光。 另外，光纤布拉格光栅（510,512）仅反射自发发射光的特定波长分量并输出自发发射光鉴别信号。

公开(公告)号：KR100380217B1

公开(公告)日：2003-04-16

申请号：KR1020000074462

申请日：2000-12-08

Applicant: 한국과학기술원

Inventor： 이창희 ,  백진석 ,  박근열

IPC: H04B10/2581

Abstract: PURPOSE: An automatic power control optical amplifier for a WDM(Wavelength Division Multiplexing) optical transmission system and a control method therefor are provided to obtain an excellent gain flattering characteristic by effectively controlling a local power of an output spectrum using a dynamic gain flattering filter. CONSTITUTION: The first amplifying unit(10) has a pump resource(10a) and a gain medium(10b) for providing a gain to an optical signal and controlling a power necessary for amplification. A dynamic gain flattering filter(22) converts a spectrum of the optical signal into a random type. The second amplifying unit(20) has a pump resource(20a) and a gain medium(20b) for providing a gain to the optical signal and controlling the power necessary for amplification. An optical monitoring unit(24) is tapped to the output of the second amplifying unit(20). A control circuit(18b) generates control signals of the dynamic gain flattering filter(22) and the pump resources(10a,20a) using the optical spectrum obtained from the optical monitoring unit(24).

Abstract translation: 目的：提供一种用于WDM（波分复用）​​光传输系统的自动功率控制光放大器及其控制方法，以通过使用动态增益平滑滤波器有效地控制输出频谱的局部功率来获得优异的增益平滑特性。 构成：第一放大单元（10）具有用于向光信号提供增益并控制放大所需的功率的泵浦源（10a）和增益介质（10b）。 动态增益平滑滤波器（22）将光信号的频谱转换为随机类型。 第二放大单元（20）具有用于向光信号提供增益并控制放大所需的功率的泵资源（20a）和增益介质（20b）。 光监控单元（24）被分接到第二放大单元（20）的输出端。 控制电路（18b）利用从光学监视单元（24）获得的光谱来生成动态增益平滑滤波器（22）和泵浦资源（10a，20a）的控制信号。

公开(公告)号：KR100334432B1

公开(公告)日：2002-11-22

申请号：KR1019980000063

申请日：1998-01-05

Applicant: 한국과학기술원

Inventor： 이창희 ,  정윤철 ,  김철한 ,  정윤철

IPC: H04J1/00

Abstract: PURPOSE: A bidirectional add/drop optical amplifier module using one arrayed-waveguide grating multiplexer is provided to embody an economic and efficient optical communication network by using only one NxN arrayed-waveguide grating multiplexer. CONSTITUTION: One NxN arrayed-waveguide grating multiplexer(20) simultaneously demultiplexes and multiplexes a wavelength division multiplexed signal bidirectionally progressed. Two 3-terminal circulators separate the path of the wavelength division multiplexed signals, and input signals progressed in inter-different directions to both sides of the NxN arrayed-waveguide grating multiplexer(20) through one optical fiber. A bidirectional optical amplifier(10) compensates the loss of an optical signal bidirectionally progressed.

公开(公告)号：KR1020020080518A

公开(公告)日：2002-10-26

申请号：KR1020010020121

申请日：2001-04-16

Applicant: 한국과학기술원

Inventor： 이창희 ,  김현덕 ,  신정훈 ,  조윤희

IPC: G02B6/00

CPC classification number: H01S3/2383 ,  H01S3/06758 ,  H01S3/06766 ,  H01S3/0677 ,  H01S5/4087 ,  H01S5/50

Abstract: PURPOSE: A broadband optical amplifier is provided to reduce a cost by configuring in such a way that optical signals having different frequency bands share devices in an intermediate stage with maintaining an advantage of a broadband optical amplifier by coupling optical amplifiers to amplify optical signals with different wavelength band in parallel. CONSTITUTION: A broadband optical amplifier includes an input terminal(P1) and an output terminal(P2), wherein after an optical signal inputted to the input terminal(P1) is amplified, the amplified optical signal is outputted to the output terminal(P2). A demultiplexer(DMUX) divides the optical signals inputted to the input terminal(P1) into a first and a second groups of optical signals and outputs the divided optical signals to a pair of output terminals, respectively. And also, a multiplexor(MUX) implements a function of coupling the first and the second optical signals inputted into the two input terminals and outputting the coupled optical signal to the output terminal(P2).

Abstract translation: 目的：提供宽带光放大器以通过配置以使得具有不同频带的光信号在中间级共享设备以保持宽带光放大器的优点，通过耦合光放大器来放大具有不同的光信号的方式来降低成本 波长带并行。 构成：宽带光放大器包括输入端（P1）和输出端（P2），其中在输入到输入端（P1）的光信号被放大之后，放大的光信号被输出到输出端（P2） 。 解复用器（DMUX）将输入到输入端（P1）的光信号分成第一和第二组光信号，并将分光信号分别输出到一对输出端。 并且，多路复用器（MUX）还实现将输入到两个输入端的第一和第二光信号耦合并将耦合的光信号输出到输出端（P2）的功能。

公开(公告)号：KR1020020066512A

公开(公告)日：2002-08-19

申请号：KR1020010006738

申请日：2001-02-12

Applicant: 한국과학기술원

Inventor： 이창희 ,  박성범

IPC: H04L12/42

CPC classification number: H04J14/0216 ,  H04J14/0283

Abstract: PURPOSE: A bidirectional WDM(Wavelength Division Multiplex) add/drop self-recovery ring-shaped metro network is provided to perform self-recovery using only one optical fiber without a specific optical switch on a transmission line when a WDM optical signal is bidirectionally transmitted in a CO(Central Office) and each RN(Remote Node) and the fault of a system is generated. CONSTITUTION: One CO and a plurality of RNs(RN1-RN3) are composed in the bidirectional WDM add/drop self-recovery ring-shaped metro network. Nodes are connected by a ring-shaped type through one optical fiber(1) for bidirectionally transmitting and receiving an optical signal. Each RN(RN1-RN3) is embodied as a BADM(Bidirectional Add/Drop Multiplexer) so that a specific wavelength signal is dropped and added in each RN(RN1-RN3).

Abstract translation: 目的：提供双向WDM（波分多路复用）加/减自恢复环形城域网，以便在WDM光信号双向传输时，仅使用一根光纤，而无需传输线路上的特定光开关 在CO（中心局）和每个RN（远程节点）中，并且生成系统的故障。 构成：一个CO和多个RN（RN1-RN3）组成在双向WDM分插自恢复环形城域网中。 节点通过一个光纤（1）通过环形类型连接，用于双向发送和接收光信号。 每个RN（RN1-RN3）被实现为BADM（双向分插复用器），使得特定波长信号被丢弃并添加到每个RN（RN1-RN3）中。

公开(公告)号：KR100301950B1

公开(公告)日：2001-10-29

申请号：KR1019990011547

申请日：1999-04-02

Applicant: 한국과학기술원

Inventor： 이창희 ,  신상영 ,  추광욱

IPC: H04B10/07 ,  H04B10/25

CPC classification number: H04B10/0773 ,  H04B10/0771 ,  H04B2210/075 ,  H04J14/0221 ,  H04J14/0227 ,  H04J14/0241 ,  H04J14/0276 ,  H04J14/0298 ,  H04Q11/0005 ,  H04Q2011/0049 ,  H04Q2011/0083

Abstract: 본발명은광 경로(optical path) 감시장치에관한것으로, 더욱상세하게는광 회선분배시스템의입력단자판별을통하여광 경로를감시할수 있도록하는광 회선분배시스템입력단자판별에의한광 경로감시장치를제공하는데 그목적이있다. 본발명에따르면, 파장분할다중된광신호를입력받는입력단자, 파장역다중장치, 광스위칭장치, 스위칭제어장치, 광스위칭장치로부터입력된광신호들의광세기의편차를줄여출력하는광 경로의존손실보상장치, 파장다중장치와파장분할다중된광신호를출력하는출력단자를구비하고있는광 회선분배시스템에적용되는광 경로감시장치에있어서, 상기입력단자를통하여입력된파장분할다중된광신호에외부로부터입력받은저속의파일럿톤을합성하기위한다수개의파일럿톤 합성장치와, 상기광 스위칭장치의각각의출력단자에접속되어, 상기광 스위칭장치로부터입력된광신호를분기시키기위한다수개의광 분기장치및 상기광 분기장치로부터분기된광신호를입력받아파일럿톤을추출하여광신호가입력된광 회선분배시스템의입력단자를판별한후에, 상기스위칭제어장치로부터입력받은라우팅정보를이용하여광 경로오류를검출하여출력하기위한파일럿톤 검출장치를포함하여이루어지며, 상기광 경로의존손실보상장치의반응시간이상기파일럿톤 합성장치에의해광신호에합성된파일럿톤까지없애기에충분히짧은것이특징인광 경로감시장치가제공된다.

公开(公告)号：KR100291954B1

公开(公告)日：2001-06-01

申请号：KR1019980016460

申请日：1998-05-08

Applicant: 한국과학기술원

Inventor： 이창희 ,  정윤철 ,  신상영 ,  이종남

IPC: H04B10/07

Abstract: PURPOSE: An apparatus and method for measuring an optical signal performance using the amplitude of a clock is provided to measure the optical signal performance such as the existence of a signal and an error rate obtained when receiving the signal by extracting a clock component of data from a transmitted optical signal and measuring a level of a clock amplitude. CONSTITUTION: An optical divider(1) and a signal converter(2) divide a part of an input optical signal and process the divided optical signal as a signal including a clock component. A narrow-band optical detector(3) extracts a clock frequency component to the optical signal from the signal converter(2) and outputs a sine wave. A super high frequency rectifier(4) converts an output of the narrow-band optical detector(3) into a DC signal. A voltage measurer(5) measures a voltage level of the DC signal from the super high frequency rectifier(4).