公开(公告)号：KR100420949B1

公开(公告)日：2004-03-02

申请号：KR1020010049025

申请日：2001-08-14

Applicant: 한국전자통신연구원

Inventor： 최지연 ,  김해근 ,  홍현하 ,  양충열

IPC: H04B10/29

CPC classification number: H04Q11/0005 ,  H04Q2011/0045

Abstract: A method capable of optical packet switching even in a case where physical optical data in an optical packet switch has not the shape of a packet but the shape of continuous data, and a system therefore are provided. The optical switching method includes the steps of (a) detecting input terminals into which an optical packet is input, of an optical switch and switching the optical packet to destination output terminals of the optical packet, and (b) when there are the input terminals into which the optical packet is not inputted in step (a), detecting other input terminals into which the optical packet, which direct an output terminal among the plurality of output terminals connected to the input terminals, is inputted, and searching a blank output terminal and switching dummy data from the input terminal to the blank output terminal. Data having the shape of all input optical packets and data having not the shape of a packet but another shape can be switched into output terminals without omission, and thus data output when input data have the shape of continuous data maintain the shape of the continuous data.

Abstract translation: 即使在光分组交换机中的物理光数据不具有分组形状而是连续数据的形状的情况下也能够进行光分组交换的方法以及系统因此被提供。 该光切换方法包括以下步骤：（a）检测输入光分组的输入端，检测光开关的切换并将光分组切换到光分组的目的输出端，以及（b）当存在输入端 （a）中没有输入光分组的光分组的输入，检测其中输入引导连接到输入端子的多个输出端子中的输出端子的光分组的其他输入端子，以及搜索空白输出端子 并将伪数据从输入端子切换到空白输出端子。 具有所有输入光分组形状的数据和不具有分组形状但是具有其他形状的数据的数据可以在没有遗漏的情况下切换到输出端子，并且因此当输入数据具有连续数据的形状时输出数据保持连续数据的形状 。

公开(公告)号：KR1020030042119A

公开(公告)日：2003-05-28

申请号：KR1020010072641

申请日：2001-11-21

Applicant: 한국전자통신연구원

Inventor： 황현용 ,  홍현하 ,  양충열 ,  최지연

IPC: H04L12/28

CPC classification number: H04Q11/0066 ,  H04L47/10 ,  H04Q2011/0064

Abstract: PURPOSE: A scheduler for an optical burst switching router and a method thereof are provided to minimize burst data loss by performing a scheduling in arrival order of burst data. CONSTITUTION: Channel information including arrival time information, offset time information and burst data length information of a header packet into which a burst data is inputted is received(41). Processing order information of a scheduling is generated on the basis of the arrival time information of burst data generated on the basis of the arrival time information of the header packet and the offset time information(42). An optical switch switching duration information is generated on the basis of the arrival time information and length information of the burst data(43). Output channel information is generated to output burst data received from an optical switch on the basis of a difference between a previously reserved activation-end time of the optical switch and an arrival time of new burst data to a transmission channel of an optical transmission path(44). Control information for controlling an optical switch fabric is generated on the basis of the processing order information of scheduling, the switching duration information of optical switch and the output channel information(45).

Abstract translation: 目的：提供一种用于光突发交换路由器的调度器及其方法，以通过执行突发数据到达顺序的调度来最小化突发数据丢失。 构成：接收包括输入突发数据的报头分组的到达时间信息，偏移时间信息和突发数据长度信息的信道信息（41）。 基于根据报头分组的到达时间信息和偏移时间信息生成的突发数据的到达时间信息，生成调度的处理顺序信息（42）。 基于突发数据（43）的到达时间信息和长度信息生成光开关切换持续时间信息。 产生输出通道信息，以根据光开关的先前保留的激活结束时间与新突发数据的到达时间之间的差与光传输路径的传输通道的差，输出从光开关接收的突发数据（ 44）。 基于调度的处理顺序信息，光开关的切换持续时间信息和输出信道信息（45）生成用于控制光交换结构的控制信息。

公开(公告)号：KR100384891B1

公开(公告)日：2003-05-22

申请号：KR1020000083274

申请日：2000-12-27

Applicant: 한국전자통신연구원

Inventor： 양충열 ,  황현용 ,  홍현하

IPC: G02B6/35

Abstract: PURPOSE: A device for gain-clamped optical amplification of optical switching system is provided to deal with an optical power fluctuation due to a channel variation promptly in an optical switching system by using a controller for controlling at a high rate a laser diode which generates a pumping laser. CONSTITUTION: A tap coupler(310,311) divides an optical signal. An optical detector(320,321) converts the divided optical signal into an electric signal. A controller(360) controls an amplification gain of the electric signal. A laser diode(370,371) generates a pumping laser. An optical isolator(330,332) inputs the pumping laser signal into an EDF(Erbium Doped Fiber)(340,341). The EDF(340,341) amplifies the input optical signal. An ASE(amplified spontaneous emission) filter(350) filters the optical signal amplified in the EDF(340). An optical isolator(331) inputs the filtered optical signal into the EDF(341).

Abstract translation: 目的：提供一种用于光开关系统的增益钳位光放大的装置，以通过使用控制器以高速率控制激光二极管来处理光开关系统中由于沟道变化而引起的光功率波动，所述激光二极管产生 泵浦激光。 构成：分接耦合器（310,311）分割光信号。 光检测器（320,321）将分割后的光信号转换成电信号。 控制器（360）控制电信号的放大增益。 激光二极管（370,371）产生泵浦激光。 光隔离器（330,332）将泵浦激光信号输入到EDF（铒掺杂光纤）（340,341）中。 EDF（340,341）放大输入光信号。 ASE（放大的自发发射）滤波器（350）对在EDF（340）中放大的光信号进行滤波。 光隔离器（331）将滤波后的光信号输入到EDF（341）中。

公开(公告)号：KR100319780B1

公开(公告)日：2002-01-09

申请号：KR1019990000079

申请日：1999-01-05

Applicant: 한국전자통신연구원 ,  주식회사 케이티

Inventor： 손만진 ,  황월연 ,  양충열 ,  홍현하 ,  한선규

IPC: G02B6/00

Abstract: 본발명은파장다중을이용하는광통신시스템혹은광 통신망에사용될수 있는파장변환기에관한것으로, 기존에알려진마이켈슨형파장변환기의문제점인한쪽팔에서의광 손실을보상하기위해싸냑간섭계를마이켈슨간섭계의한쪽팔에구성하여광섬유고리거울 (optical fiber loop mirror : OFLM)로동작시켜입력되는모든신호를다시반사시킴으로광신호의손실없이반도체광 증폭기의위상변화만일으키게함으로서신호의손실을적게하면서마이켈슨간섭계의동작으로파장변환이일어나게한다.

公开(公告)号：KR100310830B1

公开(公告)日：2001-12-17

申请号：KR1019980055811

申请日：1998-12-17

Applicant: 주식회사 케이티 ,  한국전자통신연구원

Inventor： 홍현하 ,  황월연 ,  양충열 ,  손만진 ,  한선규

IPC: H04J14/02 ,  H04B10/2581

Abstract: 본 발명은 광대역 및 대용량의 광 패킷 스위치 구현에 있어서, 용량 증대시 단위 패킷 스위치 단위로 확장이 가능하고, 필요한 광 패킷 버퍼의 수도 최소로 할 수 있으며, 패킷 라우팅을 위한 다중 및 역다중도 용이하게 하고 대용량의 분산 시스템에서 안정된 동기 기능을 제공할 수 있는 자체 패킷 동기 방식을 이용한 대용량 WDM/OTDM 기반의 광 패킷 스위칭 장치를 제공하는데 그 목적이 있다.
본 발명에 따르면, 셀 다중부, 셀 역다중부 및 광 스위칭부(Optical Switching Fabric)를 포함하는 모듈 단위로 확장이 가능한 광 패킷 스위칭 시스템에 있어서, 입력되는 광 패킷 데이터에 대하여 파장 분할 다중화(WDM : Wave Division Multiplexing) 기법을 이용하여 패킷 집선 기능을 수행하는 광 패킷 분배 및 집선부와; 상기 광 패킷 분배 및 집선부에 의하여 집선된 광 패킷을 입력받아, 광 시간 분할 다중화(OTDM : Optical Time Division bit Multiplexing) 기법을 이용하여, 독립된 단위 패킷 스위칭 기능을 수행하는 광 패킷 스위칭부를 포함하여 이루어진 것을 특징으로 하는 광 패킷 스위칭 시스템이 제공된다.

公开(公告)号：KR1020000038205A

公开(公告)日：2000-07-05

申请号：KR1019980053109

申请日：1998-12-04

Applicant: 주식회사 케이티 ,  한국전자통신연구원

Inventor： 홍현하 ,  황월연 ,  양충열 ,  한선규

IPC: H04B10/2581 ,  H04B10/25

CPC classification number: H04Q11/0005 ,  H04Q11/0066 ,  H04Q2011/0011 ,  H04Q2011/0016

Abstract: PURPOSE: A perfect optical packet switching system is provided to realize a high-speed optical packet switch without optical and electric conversion and great amount of optical packet buffer by converting input packet as different wavelength and subsequently routing. CONSTITUTION: N wavelength inverse multiplexors(100) wavelength inversely multiplexes the optical packet data wavelength multiplexed on the input link. L variable wavelength converters(200) connected to the N wavelength inverse multiplexors for converting input packet data inversely multiplexed in the wavelength inverse multiplexors to optical packet data having different wavelengths within a range of WDM(Wavelength Division Multiplexing) channel number on the output link. An optical space switch(400) has input-output dimension of (L.N+M)x(N+M) for routing optical packet data converted in the L,N variable wavelength converter, and a plurality of packet data input through M WDM feedback channels(300) to an output end according to routing information and multiplexing as optical packet data having L wavelengths on the output link to transmit to other perfect packet switch or electric ATM switchboard.

Abstract translation: 目的：提供一种完美的光分组交换系统，通过将输入分组转换为不同的波长和随后的路由，实现无需光电转换的高速光分组交换和大量的光分组缓冲。 构成：N个波长反向多路复用器（100）波长反向复用在输入链路上复用的光分组数据波长。 L可变波长转换器（200），连接到N个波长反向多路复用器，用于将在波长反向多路复用器中反相多路复用的输入分组数据转换为在输出链路上的WDM（波分复用）​​信道号范围内具有不同波长的光分组数据。 光学空间开关（400）具有用于路由在L，N可变波长转换器中转换的光分组数据的（L.N + M）x（N + M）的输入输出尺寸和通过M输入的多个分组数据 WDM反馈信道（300）根据路由信息输出到输出端，并将其复用为在输出链路上具有L波长的光分组数据，以传输到其他完美分组交换机或电动ATM交换机。

公开(公告)号：KR1020000019603A

公开(公告)日：2000-04-15

申请号：KR1019980037782

申请日：1998-09-14

Applicant: 한국전자통신연구원 ,  주식회사 케이티

Inventor： 양충열 ,  박혁 ,  황월연 ,  홍현하 ,  한선규

IPC: G02F1/133

Abstract: PURPOSE: A bias stabilization circuit is provided to control a bias exactly and stably by controlling the bias to minimize a value which is obtained to measure and extract an off state of an output light signal selectively. CONSTITUTION: In a bias stabilization circuit of a light modulator, a sampling and holding portion(610) catches a minimum point of an output light signal inputted from the exterior, and samples and holds the catched minimum point. An analog signal processing portion(620) amplifies a signal outputted from the sampling and holding portion and converts the amplified signal into a digital signal. A count processing portion(630) counts up and down an output signal of the analog processing portion, and a digital signal processing portion(640) converts an output signal of the count processing portion into an analog signal. A signal conversion and amplification portion(650) converts an output signal of the digital signal processing portion into a voltage signal and amplifies the voltage signal.

Abstract translation: 目的：提供一种偏置稳定电路，通过控制偏压来精确和稳定地控制偏压，以最小化一个值，以便选择性地测量和提取输出光信号的关闭状态。 构成：在光调制器的偏置稳定电路中，采样和保持部分（610）捕获从外部输入的输出光信号的最小点，并采样并保持捕获的最小点。 模拟信号处理部分（620）放大从采样和保持部分输出的信号，并将放大的信号转换为数字信号。 计数处理部（630）对模拟处理部的输出信号进行上下计数，数字信号处理部（640）将计数处理部的输出信号变换为模拟信号。 信号转换和放大部分（650）将数字信号处理部分的输出信号转换成电压信号并放大电压信号。

公开(公告)号：KR1020000015620A

公开(公告)日：2000-03-15

申请号：KR1019980035647

申请日：1998-08-31

Applicant: 한국전자통신연구원 ,  주식회사 케이티

Inventor： 양충열 ,  박혁 ,  황월연 ,  홍현하 ,  한선규

IPC: G02F1/39

CPC classification number: G02F1/0123 ,  G02F2001/212

Abstract: PURPOSE: A bias stabilization of optical modulator using the sample and hold method is provided to stabilize an output characteristic of Mach-Zehnder interferometer type optical modulator which consists of LiNbO3 or electric optical polymer. CONSTITUTION: The bias stabilization of optical modulator using the sample and hold method comprises: an output light on/off detection unit(100), an adaptive bias adjustment unit(200) and a bias control voltage output unit(300). The output light on/off detection unit(100) consists of a sampling triggering signal generation part(111), a transposed amplification part(112), a sample and hold part(113), a loss pass filter part(114), a gain adjustment part(115) and an A/D conversion part(116). The adaptive bias adjustment unit(200) includes a line driver part(211), a 8 bit control part(212), an initial bias up/down control part(213) and a clock providing part(214). The bias control voltage output unit(300) consists of an edge triggering type latch part(311), a digital/analog conversion part(312), a reference voltage adjustment part(313) and a current-voltage conversion and gain control part(314).

Abstract translation: 目的：提供使用采样和保持方法的光调制器的偏置稳定，以稳定由LiNbO3或电光聚合物组成的马赫 - 曾德干涉仪型光学调制器的输出特性。 构成：使用采样保持方式的光调制器的偏置稳定性包括：输出光开/关检测单元（100），自适应偏置调整单元（200）和偏置控制电压输出单元（300）。 输出光开/关检测单元（100）包括采样触发信号产生部分（111），转置放大部分（112），采样和保持部分（113），损耗通过滤波器部分（114）， 增益调整部（115）和A / D转换部（116）。 自适应偏置调整单元（200）包括线路驱动器部分（211），8位控制部分（212），初始偏置上升/下降控制部分（213）和时钟提供部分（214）。 偏置控制电压输出单元（300）包括边缘触发型锁存部分（311），数字/模拟转换部分（312），参考电压调节部分（313）和电流 - 电压转换和增益控制部分 314）。