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公开(公告)号：KR100870896B1
公开(公告)日：2008-11-28
申请号：KR1020070021476
申请日：2007-03-05
Applicant: 한국과학기술원
IPC: H04B10/2507 , H04B10/2543 , H04B10/25
Abstract: 광전송 시스템의 전송 링크에 크게 영향을 받지 않고 사광파 혼합 현상을 보상할 수 있는 보상기에 관해 개시한다. 본 발명의 장치는 HNLF(Highly-Nonlinear Fiber) 등을 채용한 비선형단과 펌프 레이저 등을 채용한 펌프단을 이용하여, 장치에 인가되는 광신호들과 전송 링크에서 발생한 사광파 혼합 성분들의 파장을 변환시킬 뿐만 아니라 새로운 사광파 혼합 성분들을 발생시킨다. 이렇게 발생된 성분들은 기존의 전송링크에서 발생하여 보상기에서 파장이 변환된 사광파 혼합 성분들과 같은 파장을 가지지만 서로 반대의 위상을 가진다. 따라서, 두 종류의 성분들은 서로 상쇄되고 결국 사광파 혼합 현상에 의한 신호의 누화를 보상할 수 있게 된다. 본 발명의 사광파 혼합 보상기는 기존의 OPC와는 다르게 수신단 바로 앞에 사용될 수 있으므로 그 성능이 뛰어날 뿐 아니라 전송링크에서의 색분산이나 광신호 파워의 분포와 무관하다. 그러므로 기존의 OPC의 방법보다 훨씬 진보된 방법이라고 할 수 있다.
사광파 혼합, 보상기, 비선형단, HNLF, 파장분할 다중, DSF, 상쇄-
公开(公告)号：KR1020080073446A
公开(公告)日：2008-08-11
申请号：KR1020070012084
申请日：2007-02-06
Applicant: 한국과학기술원
IPC: H04B10/291 , H04B10/00
CPC classification number: H04J14/0226 , H04B10/2587 , H04J14/0227 , H04J14/0246 , H04J14/025 , H04J14/0282 , H04J2014/0253
Abstract: An RSOA(Reflective Semiconductor Optical Amplifier)-based ONU(Optical Network Unit) system having improved transmission quality is provided to modulate a downlink signal into a Manchester format in ONUs using RSOAs as light sources of each subscriber, thereby remarkably improving transmission quality of a re-modulated uplink signal. ONUs(250) using RSOAs(254) as light sources of each subscriber use Manchester format for a modulation type of downlink signals delivered to each ONU from a CO(Central Office)(200). The ONUs are WDM(Wavelength Division Multiplexing) PONs(Passive Optical Networks). The WDM PONs are in uni-directional structure or in bi-directional structure. An RN(Remote Node)(210) comprises a coupler(218) for distributing downlink signals, the third AWG(Arrayed Waveguide Grating)(220) for wavelength multiplexing, a circulator(222) for determining transmission paths of uplink/downlink signals, and the fourth AWG(224) for generating uplink signals.
Abstract translation: 提供了具有改进的传输质量的RSOA（反射半导体光学放大器）的ONU（光网络单元）系统，以使用RSOA作为每个用户的光源来调制下行链路信号成为曼彻斯特格式，从而显着提高传输质量 重调制上行链路信号。 使用RSOA（254）作为每个用户的光源的ONU（250）使用曼彻斯特格式来从CO（中心局）（200）传送到每个ONU的调制类型的下行链路信号。 ONU是WDM（波分复用）PON（被动光网络）。 WDM PON是单向结构或双向结构。 RN（远程节点）（210）包括用于分配下行链路信号的耦合器（218），用于波长复用的第三AWG（阵列波导光栅）（220）），用于确定上行链路/下行链路信号的传输路径的环行器（222） 和用于产生上行链路信号的第四AWG（224）。
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公开(公告)号：KR100439086B1
公开(公告)日：2004-07-05
申请号：KR1020020011921
申请日：2002-03-06
Applicant: 한국과학기술원
IPC: G02B6/293
Abstract: PURPOSE: An optical branch/coupler using one arrayed waveguide grating is provided to accommodate N optical signal channels, and to suppress the influence of crosstalk. CONSTITUTION: An arrayed waveguide grating(10) branches a multiplexed optical signal inputted through an input optical fiber into N connected ports, and multiplexes the optical signal inputted from N connection ports and then outputs it to an output optical fiber. N optical passive devices are connected to the N connection ports one by one, and branch the multiplexed optical signal into at least two outputs. And N optical switches receive inputs from at least two of the plurality of optical passive devices, and transfer the input to a channel receiver by selective switching, and transfer the optical signal received from a channel transmitter to the optical passive device. A fold back path is formed with one of two inputs of the optical switch and an optical passive device connected to the same.
Abstract translation: 目的：提供使用一个阵列波导光栅的光学分支/耦合器以容纳N个光信号通道，并且抑制串扰的影响。 组成：阵列波导光栅（10）将通过输入光纤输入的多路复用光信号分支成N个连接端口，并将从N个连接端口输入的光信号多路复用，然后输出到输出光纤。 N个光无源器件一个一个地连接到N个连接端口，并且将复用光信号分支成至少两个输出。 并且N个光开关从多个光无源器件中的至少两个接收输入，并且通过选择性切换将输入传送到信道接收器，并将从信道发送器接收的光信号传送到光无源器件。 折回路径由光开关的两个输入端中的一个和与其连接的光无源装置形成。
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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
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.
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公开(公告)号：KR1020020019855A
公开(公告)日：2002-03-13
申请号：KR1020000053216
申请日：2000-09-07
Applicant: 한국과학기술원
IPC: H04B10/572 , H04B10/294 , H04B10/2581
CPC classification number: H04B10/506 , H01S5/0687 , H01S5/4087 , H04B10/572 , H04J14/02
Abstract: PURPOSE: An apparatus and a method for stabilizing multiwavelength for a wavelength division multiplexing optical communication system are provided to simultaneously stabilize lots of WDM channels through one control loop, and efficiently restrain frequency offset by using an FFT, thereby accurately and simultaneously stabilizing frequency of each laser. CONSTITUTION: A modulating element modulates output wavelength of transmitting lasers(22a,22b,...,22n) different from each other in wavelength. An optical distribution element(26a) distributes optical signals into two parts to stabilize wavelength of wavelength division multiplexed optical signals. An optical detection element(14a) detects one part of the distributed optical signals. An optical filtering element(24) filters wavelength division multiplexed optical signals in an optical frequency area. An optical detection element(14b) detects the other part of the distributed optical signals after passing through the optical filtering elements(14a,14b) to stabilize wavelength of the wavelength division multiplexed optical signals at each reference frequency. Calculation elements(16,20) calculate the detected optical signals for detecting the first differential signal of the optical filtering elements(14a,14b). An output element(18) performs predetermined output from the detected first differential signal to control the transmitting lasers(22a,22b,...,22n).
Abstract translation: 目的：提供一种用于波分复用光通信系统稳定多波长的装置和方法，以通过一个控制环同时稳定大量的WDM信道，并通过使用FFT有效地抑制频偏，从而精确并同时稳定每个 激光。 构成：调制元件调制波长不同的发射激光器（22a，22b，...，22n）的输出波长。 光分配元件（26a）将光信号分为两部分，以稳定波分复用光信号的波长。 光检测元件（14a）检测分布式光信号的一部分。 光滤波元件（24）对光频区域中的波分复用光信号进行滤波。 光检测元件（14b）在通过光学滤波元件（14a，14b）之后检测分布式光信号的另一部分，以稳定每个参考频率处的波分复用光信号的波长。 计算元件（16,20）计算用于检测光学滤波元件（14a，14b）的第一差分信号的检测光信号。 输出元件（18）从检测到的第一差分信号执行预定的输出，以控制发送激光器（22a，22b，...，22n）。
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Patent Agency Ranking
公开(公告)号：KR100292808B1
公开(公告)日：2001-06-15
申请号：KR1019990008384
申请日：1999-03-12
Applicant: 한국과학기술원
IPC: H04B10/07 , H04B10/2581
CPC classification number: H04J14/02 , H04B10/0775 , H04B2210/075
Abstract: 본발명은, 파장분할다중광전송시스템에서의필터를이용한주파수감시장치에관한것으로, 특히파장분할다중광전송시스템에서시스템의유지및 관리를효율적으로하기위하여투과특성이서로다른광학필터와각 광신호에인가한서로다른주파수의파일롯톤 신호를이용한주파수감시장치를제공하는데그 목적이있다. 본발명에따르면, 외부로부터입력되는파일럿톤 신호를포함하고있는광신호를분배하기위한광 분배수단; 상기광 분배수단에의해분배된광신호의일정한주파수영역만을통과시키기위한서로투과특성이다른다수의광학필터링수단; 상기광학필터링수단의출력을전기적신호로변환시키기위한광 검출수단; 상기광 검출수단의출력으로부터파일럿톤의세기를감지하여광신호의주파수를측정하기위한광주파수추출수단을포함하여이루어진주파수감시장치가제공된다.
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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
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).
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公开(公告)号：KR100271210B1
公开(公告)日：2000-11-01
申请号：KR1019980035810
申请日：1998-09-01
Applicant: 한국과학기술원
CPC classification number: H04Q11/0005 , H04Q2011/0047 , H04Q2011/0075
Abstract: 본 발명은 광전송망에 사용되는 계층별로 모듈화된 내부구조를 가지는 광회선 분배기(optical cross-connect)에 관한 것이다. 본 발명의 목적은, 계층별로 모듈화되어 있어 유지관리가 용이하고, 전송망의 진화에 효율적으로 대비할 수 있으며, 다양한 망구조에 사용할 수 있으며, 간단한 구조의 스위치를 사용하여 광회선분배기의 제어를 단순화함과 동시에 광회선 분배기에서 발생하는 신호의 열화를 최소화하는 광회선 분배기를 제공하는 데 있다.
이러한 본 발명은, 다른 노드에서 해당 노드로 신호들을 운반하는 M개의 입력 광섬유와 해당 노드로부터 애드(add)되는 신호들을 운반하는 m개의 입력 광섬유에 하나씩 결합되어 입력신호들을 분배하는 M+m개의 1×M 분할기(splitter)와: M개의 입력단자를 통해 입력되는 신호들 중 해당 노드에서 드롭될 신호를 선택하여 M개의 출력단자를 통해 출력하는 드롭용 링크모듈(link module):및 M+m-1개의 입력단자를 통해 입력되는 신호 중 다음 노드로 전송되어야 하는 신호들을 선택하여 하나의 출력단자를 통해 출력하는 M개의 전송용 링크모듈들을 구비한 것을 특징으로 한다.-
公开(公告)号：KR100271206B1
公开(公告)日：2000-11-01
申请号：KR1019980016017
申请日：1998-05-04
Applicant: 한국과학기술원
IPC: H04B10/07 , H04B10/2581
Abstract: PURPOSE: A device for monitoring a frequency and an optical output using a temperature-controlling etalon filter in a WDM(Wavelength Division Multiplexing) optical transmission system is provided to use a solid etalon filter capable of controlling a temperature in the WDM optical transmission system, to monitor a frequency and an optical output of each channel. CONSTITUTION: An optical distributor distributes multiplexed input optical signals. A solid etalon filter having resonant frequencies receives the distributed optical signals, to pass only a predetermined frequency range according to a temperature. A thermistor is fixed on the etalon filter to measure a temperature of the etalon filter). A thermoelectric cooler is coupled to the filter to cool the filter. A temperature controller controls the currents of the thermoelectric cooler, to control a temperature of the filter. An optical output measurer measures the strength of the optical signals passing the etalon filter, to calculate the frequency and optical output of the optical signals. And the resonant frequencies of the etalon filter controls the temperature of the etalon filter through the temperature controller.
Abstract translation: 目的：提供一种在WDM（波分复用）光传输系统中使用温度控制标准具滤波器监测频率和光输出的装置，以使用能够控制WDM光传输系统中的温度的固体标准具滤波器， 以监视每个通道的频率和光输出。 构成：光分配器分配复用的输入光信号。 具有谐振频率的固体标准具滤波器接收分布式光信号，仅根据温度通过预定的频率范围。 热敏电阻固定在标准具过滤器上，以测量标准具过滤器的温度）。 热电冷却器耦合到过滤器以冷却过滤器。 温度控制器控制热电冷却器的电流，以控制过滤器的温度。 光输出测量器测量通过标准具滤波器的光信号的强度，以计算光信号的频率和光输出。 并且标准具滤波器的谐振频率通过温度控制器控制标准具滤波器的温度。
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公开(公告)号：KR1020000055045A
公开(公告)日：2000-09-05
申请号：KR1019990003473
申请日：1999-02-03
Applicant: 한국과학기술원
CPC classification number: H04J14/005 , H04B10/25752 , H04J14/0282 , H04J14/083
Abstract: PURPOSE: A network for multi-purpose optical fiber access is provided to supply services of telephone, data and cable television(CATV) through optical network units(ONUs), by connecting the optical fiber access network with an existing wired network configured with a twisted fair and a coaxial cable. CONSTITUTION: A network for multi-purpose optical fiber access of a dual shaping structure connecting a central office/head office(CE/HO,110) with many optical network units(ONUs,161,163,165,167,169,171) through a first branch element, comprises a second branch element, a third branch element and a first area wireless base station. The second branch element is for branch of a signal by being positioned in a down transmission line between the CE/HO and the first branch element. The third branch element combines signals to transmit the CE/HO by being positioned in a up transmission line between the CE/HO and the first branch element. And the first area wireless base station receives a signal of a sub-carrier multiple system to convert to a wireless sky wave frequency signal and propagate to space. Also, the first area wireless base station converts the wireless sky wave frequency signal to a signal of a sub-carrier multiple system with an intermediate frequency to transmit to the CE/HP through the third branch element.
Abstract translation: 目的：通过将光纤接入网与现有的有线网络配合使用，通过光网络单元（ONU）为电话，数据和有线电视（CATV）提供服务，提供多用途光纤接入网络 公平和同轴电缆。 构成：通过第一分支元件将中心局/总部（CE / HO，110）与许多光网络单元（ONU，161,163,165,167,169,171）连接的双重整形结构的多用途光纤接入网络包括第二分支 元件，第三分支元件和第一区域无线基站。 第二分支元件用于通过定位在CE / HO和第一分支元件之间的向下传输线中来分支信号。 第三分支元件组合信号以通过定位在CE / HO和第一分支元件之间的上传输线中来传送CE / HO。 并且第一区无线基站接收副载波多系统的信号，以转换成无线天波频率信号并传播到空间。 此外，第一区域无线基站将无线天波频率信号转换为具有中频的子载波多系统的信号，以通过第三分支元件发送到CE / HP。
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