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公开(公告)号：KR100454887B1
公开(公告)日：2004-11-06
申请号：KR1020020005326
申请日：2002-01-30
Applicant: 한국과학기술원
IPC: H04B10/2581 , H04B10/2507
CPC classification number: H04J14/0297 , H04B10/032 , H04B10/2503 , H04B10/27 , H04B10/272 , H04B10/2939 , H04B10/2972 , H04J14/02 , H04J14/0282
Abstract: The present invention relates to a wavelength-division multiplexed passive optical network. In particular, it relates to a technology for minimizing the optical loss at a wavelength-division multiplexed passive optical network based on wavelength-locked light source Thereby it improves the transmission quality and increases the transmission distance. A 4-port optical path setting device of the present invention increases the amount of light injected into an optical transmitter and thereby improves the wavelength-locking characteristic of a light source. In addition, it can decrease the optical transmission loss in an optical transmission path, and by an optical amplifier being inserted therein; it can also compensate the optical loss in an optical transmission path. In the present invention, a 4-port optical path setting device having the characteristics described above and a method for fault recovery without an additional optical loss are presented.
Abstract translation: 波分复用无源光网络技术领域本发明涉及一种波分复用无源光网络。 尤其涉及一种用于使基于波长锁定光源的波分复用无源光网络中的光损失最小化的技术。由此，提高了传输质量并增加了传输距离。 本发明的4端口光路设置装置增加了注入光发送器的光量，从而提高了光源的波长锁定特性。 另外，它可以降低光传输路径中的光传输损耗，并且通过插入光放大器; 它也可以补偿光传输路径中的光损耗。 在本发明中，提出了具有上述特征的4端口光路设置装置和用于故障恢复而没有附加光损耗的方法。
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公开(公告)号：KR1020030072786A
公开(公告)日：2003-09-19
申请号：KR1020020011982
申请日：2002-03-06
Applicant: 한국과학기술원
IPC: G02B6/00
Abstract: PURPOSE: A receiving error rate improving system of a low frequency-added optical signal is provided to lessen the increase of error rate generated due to low frequency modulation effect. CONSTITUTION: According to an optical communication receiver system for improving a receiving error rate of an optical signal using a variable decision threshold signal, a low frequency band extraction unit is connected to the rear of one side of an optical isolator(11) where an optical signal with low frequency modulation is inputted and thus an output optical signal is used as a variable decision threshold signal of a decision circuit(16). And a high frequency signal receiving unit is connected to the rear of another side of the optical isolator and thus the output optical signal is used as a data signal of the decision circuit.
Abstract translation: 目的：提供低频附加光信号的接收误码率改善系统，以减少由于低频调制效应而产生的误码率的增加。 构成：根据用于使用可变判定阈值信号来提高光信号的接收误差率的光通信接收机系统，低频带提取单元连接到光隔离器（11）的一侧的后部，其中光学 输入低频调制信号，由此输出光信号用作判决电路（16）的可变判定阈值信号。 并且高频信号接收单元连接到光隔离器的另一侧的后面，因此输出光信号被用作决定电路的数据信号。
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公开(公告)号：KR100330409B1
公开(公告)日：2002-08-27
申请号：KR1019980029579
申请日：1998-07-23
Applicant: 한국과학기술원
IPC: H04J14/02 , H04B10/2581
Abstract: 본 발명은 파장분할다중 방식 다중화/역다중화 장치와 이를 이용한 파장분할다중 방식 수동형 광가입자망에 관한 것으로, 본 발명의 목적은 파장분할다중 방식 수동형 광 가입자망을 경제적으로 구현하기 위해 한 개의 다중화/역다중화 수단을 이용해 동시에 상하 방향의 신호들에 다중화 및 역다중화 기능을 수행하도록 한 다중화/역다중화 장치 및 이를 이용한 파장분할다중 방식 수동형 광 가입자망을 제공하는데 있다.
이를 위해 본 발명의 다중화/역다중화 장치는 파장분할다중 방식 수동형 광 가입자망에 적용되는 다중화/역다중화 장치에 있어서, 임의의 자연수 N개의 입출력단들을 갖는 한 개의 다중화/역다중화 수단을 구비하되, 상기 N-1개의 입력단들을 통해 입력되는 한 방향의 파장분할된 신호들이 한 개의 출력단을 통해 다중화되어 출력되고, 동시에 나머지 한 개의 입력단을 통해 입력되는 다른 방향의 파장분할 다중화된 신호가 나머지 N-1개의 출력단들을 통해 역다중화되어 출력되도록 한 것을 특징으로 한다. 여기서, 상기 다중화/역다중화 수단은 도파로 격자형 라우터를 포함한다.-
公开(公告)号：KR100342429B1
公开(公告)日：2002-07-03
申请号：KR1020000058299
申请日：2000-10-04
Applicant: 한국과학기술원
IPC: H04B10/2581 , H04B10/516
Abstract: 본 발명은 광 필터링 방법에 의한 직접변조 방식의 메트로 파장분할 다중방식 시스템에 관한 것이다.
종래의 직접 변조 방식은 변조시 레이저 다이오드에서 발생하는 처핑에 의한 색분산 효과와 광 소광비가 좋지 못하므로 전송에 제한을 받게 된다.
이에, 본 발명은 메트로용 광 네트워크에 직접 변조 방식을 채택하기 위해 광 필터링 방법을 이용하여 1) 직접 변조 과정에서 발생하는 처핑을 효과적으로 제거하여 색분산에 의한 페널티를 줄인다. 2) 광소비를 향상시키기 위해 off 준위의 광 신호에너지도 함께 제거하여 광소광비에 의한 페널티를 줄인다. 3) 또한, 높은 파워의 광신호를 파장분할 다중화 시켜 송신할 경우 발생하는 상호위상 변조와 4광파 혼합과 같은 비선형 효과를 효과적으로 억제한다.
따라서, 본 발명에서 제안한 광 필터링 방법을 사용하면 광 소광비를 향상시키고, 처핑에 의한 색분산 효과와 비선형 효과를 효과적으로 제거하여 경제적인 직접변조 송신방식으로도 양질의 신호를 전송할 수 있다.-
公开(公告)号：KR1020020013660A
公开(公告)日：2002-02-21
申请号：KR1020000047000
申请日：2000-08-14
Applicant: 한국과학기술원
IPC: G02B6/28
CPC classification number: H04B10/2504
Abstract: PURPOSE: A multi-stage bidirectional optical amplifier is provided, which is more economical than an optical amplifier using an additional mid-stage device per optical signal propagating bidirectionally, and can reduce a degradation of the signal due to a nonlinearity of the mid-stage device even though the number of optical signals inputted to the mid-stage device increases. CONSTITUTION: Single-stage bidirectional optical amplifiers(30a,30b) comprise two input/output ports(p1,p2) to amplify a downward/upward optical signal propagating bidirectionally and amplify the optical signal at the same time by being connected to the input/output port. Multi-reflection suppression units(28a,28b) are connected to input/output ports of the single-stage bidirectional optical amplifiers respectively, and transfer an optical signal of a specific wavelength toward one direction. And a mid-stage device(42) is connected between the multi-reflection suppression units, and comprises a unit for dispersive compensation, a unit for an optical amplifier gain flattering and a unit for noise accumulation removal of the optical amplifier.
Abstract translation: 目的：提供一种多级双向光放大器，它比使用每个光信号双向传播的附加中级器件的光放大器更经济，并且可以减少由于中间级的非线性而导致的信号劣化 即使输入到中段装置的光信号的数量增加。 构成：单级双向光放大器（30a，30b）包括两个输入/输出端口（p1，p2），以放大双向传播的向下/向上的光信号，并通过连接到输入/ 输出端口 多反射抑制单元（28a，28b）分别连接到单级双向光放大器的输入/输出端口，并将特定波长的光信号传送到一个方向。 并且中间级装置（42）连接在多反射抑制单元之间，并且包括用于色散补偿的单元，用于光放大器增益放大的单元和用于光放大器的噪声累积去除的单元。
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Patent Agency Ranking
公开(公告)号：KR1020020011813A
公开(公告)日：2002-02-09
申请号：KR1020000045367
申请日：2000-08-04
Applicant: 한국과학기술원
IPC: G02B5/20
CPC classification number: G02B6/272 , G02B6/2746 , G02B6/2766 , H01S3/0064 , H01S3/06754
Abstract: PURPOSE: A method and a system for embodying a non-reciprocal optical wavelength filter are provided to have different periodical characteristics in accordance with propagation direction of a beam by damping reflection beams of respective directions using an optical wavelength filter having different transfer characteristics in both directions. CONSTITUTION: A faraday rotator has a non-reciprocal characteristics. The polarization status of a WDPC(Wavelength Dependent Polarization Converter) is varied in accordance with wavelength. Two birefringent crystals(BC1,BC2) split the polarization of an optical wave into two beams of orthogonal polarization using an anisotropic crystal. An RR(reciprocal rotator) rotates an incident optical wave in accordance with the propagation direction of the incident optical wave.
Abstract translation: 目的：提供一种用于实现不可逆光波长滤波器的方法和系统，以通过使用具有不同传输特性的光学波长滤波器在两个方向上衰减各个方向的反射光束来根据光束的传播方向具有不同的周期特性 。 构成：法拉第旋转器具有不可逆的特性。 WDPC（波长相关偏振转换器）的偏振状态根据波长而变化。 两个双折射晶体（BC1，BC2）使用各向异性晶体将光波的极化分成两束正交极化。 RR（往复旋转器）根据入射光波的传播方向旋转入射光波。
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公开(公告)号：KR1020010077690A
公开(公告)日：2001-08-20
申请号：KR1020000005652
申请日：2000-02-07
Applicant: 한국과학기술원
IPC: H04B10/2581
CPC classification number: H04J14/0204 , H04B10/2914 , H04B10/294 , H04J14/0205 , H04J14/0209
Abstract: PURPOSE: A wavelength alternating type bi-directional optical add/drop amplifier module using an arrayed waveguide grating multiplexer is provided to offer a simple structured bi-directional optical add/drop amplifier by using an optical fiber for communication, an optical fiber for protection and a single N x N multiplexer. CONSTITUTION: A bi-directional optical add/drop amplifier module consists of a single N x N arrayed waveguide grating multiplexer(101) and two optical rotating devices(102,103). The single N x N arrayed waveguide grating multiplexer(101) is connected in the form of fold-back type to perform the multiplexing and the demultiplexing of wavelength division multiplexed signals simultaneously. The optical rotating devices(102,103) separate a bi-directional signals from each other, demultiplex the separated signals and combine the demultiplexed bi-directional signals.
Abstract translation: 目的：提供使用阵列波导光栅复用器的波长交替型双向光分插放大器模块，通过使用光纤进行通信，保护光纤和保护光纤提供简单的结构双向光分插放大器， 单个N×N多路复用器。 构成：双向光分插放大器模块由单个N×N阵列波导光栅多路复用器（101）和两个旋转旋转装置（102,103）组成。 单个N×N阵列波导光栅多路复用器（101）以折叠式形式连接，以同时执行波分复用信号的复用和解复用。 光学旋转设备（102,103）将双向信号彼此分离，对分离的信号进行解复用并组合解复用的双向信号。
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公开(公告)号：KR1020000009569A
公开(公告)日：2000-02-15
申请号：KR1019980030092
申请日：1998-07-27
Applicant: 한국과학기술원
IPC: H04J14/02 , H04B10/2581 , H04B10/03 , H04B10/07
CPC classification number: H04J14/0268 , H04J14/0216 , H04J14/0283 , H04Q11/0005
Abstract: PURPOSE: A bi-directional wavelength division multiplexing self-healing optical communication network embodies a bi-directional add/drop multiplexer having a simple structure by using one NxN multiplexer, and uses only two optical fibers by using the bi-directional add/drop multiplexer. CONSTITUTION: In an optical communication network wherein two optical fibers are interconnected between nodes, two optical signal receivers(10,19) sense a receiving of the optical signal. Two switching parts(13,16) are switched to a spare optical fiber in case of a cutting of an operating optical fiber. Two switching controllers(12,17) control the switching parts. A multiplexing/demultiplexing part is connected between the switching parts, and performs a multiplexing and a demultiplexing at the same time. Many optical amplifiers are connected to the optical ring and a spare ring. The multiplexing/demultiplexing part(B-ADM) includes one multiplexer for performing a multiplexing and a demultiplexing of the wavelength divided signals being fold-back connected therebetween, two circulators, and two filters for filtering the multiplexed signals from the multiplexer. Thereby, the number of optical fibers needed to a bi-directional self-healing optical communication network is reduced by half.
Abstract translation: 目的：双向波分复用自愈光通信网络通过使用一个NxN多路复用器实现了具有简单结构的双向分插复用器，并且仅使用两根光纤通过使用双向分插复用器 。 构成：在其中两个光纤在节点之间互连的光通信网络中，两个光信号接收器（10,19）感测到光信号的接收。 在切割操作光纤的情况下，两个切换部件（13,16）被切换到备用光纤。 两个开关控制器（12,17）控制开关部件。 多路复用/解复用部分连接在切换部分之间，并且同时进行多路复用和解复用。 许多光放大器连接到光环和备用环。 复用/解复用部分（B-ADM）包括一个多路复用器，用于对其间进行折叠连接的波长分割信号进行多路复用和解复用，两个循环器和用于对来自多路复用器的复用信号进行滤波的两个滤波器。 因此，双向自愈光通信网络所需的光纤数目减少了一半。
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