公开(公告)号：US06532106B2

公开(公告)日：2003-03-11

申请号：US09753451

申请日：2001-01-04

申请人： Yun Chur Chung ,  Chul Han Kim

发明人： Yun Chur Chung ,  Chul Han Kim

IPC分类号： H04B1012

CPC分类号： H01S3/06754 ,  H01S3/06704 ,  H01S3/06758 ,  H01S3/06787

摘要： A bidirectional add/drop optical amplifier used in wavelength division multiplexing (WDM) optical networks to suppress the power change resulting from the adding and dropping of optical signals using an all optical gain control includes two fiber Bragg gratings (FBGs) and a bidirectional add/drop optical amplifier module composed of an Arrayed Waveguide Grating (AWG) and two bidirectional optical amplifiers. The filtered amplified spontaneous emission (ASE) lights are lased with the two FBGs and then used to adjust the gain of the bidirectional amplifiers.

摘要翻译： 用于波分复用（WDM）光网络的双向分插光放大器，用于抑制由全光增益控制增加和丢弃光信号引起的功率变化，包括两个光纤布拉格光栅（FBG）和双向加/ 由放大波导光栅（AWG）和两个双向光放大器组成。 经滤波的放大自发发射（ASE）光照两个FBG，然后用于调整双向放大器的增益。

公开(公告)号：US07149428B2

公开(公告)日：2006-12-12

申请号：US10442891

申请日：2003-05-20

申请人： Yun Chur Chung ,  Seung Kyun Shin ,  Chul Han Kim

发明人： Yun Chur Chung ,  Seung Kyun Shin ,  Chul Han Kim

IPC分类号： H04J14/00 ,  H04B10/08

CPC分类号： H04B10/07955 ,  H04B10/077 ,  H04B10/07953

摘要： The present invention provides a method and an apparatus for monitoring optical signal to noise ratio (OSNR) in a wavelength division multiplexing optical transmission system. The present invention utilizes a polarization nulling method and a tunable optical bandpass filter in order to reliably monitor the OSNR by considering a finite polarization nulling ratio, polarization mode dispersion and non-linear birefringence of the optical system in real time measurement of the OSNR. Further, the tunable optical bandpass filter is controlled to filter all wavelength bands of wavelength division multiplexed signals. Since the invention may monitor a plurality of demultiplexed optical signals with a single apparatus, the overall cost of the OSNR monitoring equipment is significantly reduced.

摘要翻译： 本发明提供了一种用于在波分复用光传输系统中监视光信噪比（OSNR）的方法和装置。 本发明利用偏振归零方法和可调光带通滤波器，通过考虑OSNR的实时测量中的光学系统的有限极化归零比，偏振模色散和非线性双折射来可靠地监视OSNR。 此外，可调光带通滤波器被控制以滤波波分复用信号的所有波段。 由于本发明可以使用单个设备监视多个解复用的光信号，所以OSNR监视设备的总体成本显着降低。

公开(公告)号：US06813021B2

公开(公告)日：2004-11-02

申请号：US09767919

申请日：2001-01-24

申请人： Yun Chur Chung ,  Chul Han Kim ,  Dae Kwang Jung ,  Jun Hang Lee

发明人： Yun Chur Chung ,  Chul Han Kim ,  Dae Kwang Jung ,  Jun Hang Lee

IPC分类号： G01J400

CPC分类号： G01J4/00

摘要： The present invention relates to a method and apparatus for automatically monitoring an optical signal-to-noise ratio in which an arbitrarily polarized optical signal including an unpolarized ASE noise is inputted to a rotating quarter-wave plate and then to a rotating linear polarizer so that a maximum power and a minimum power of the signal outputted from the rotating linear polarizer can be detected, and the detected maximum power and minimum power is used for automatically monitoring the optical signal-to-noise ratio. The method for monitoring the optical signal-to-noise ratio (OSNR) using a polarization-nulling method, comprises the steps of: (a) linearly polarizing an arbitrarily polarized optical signal including an unpolarized ASE noise; (b) separating the optical signal and the ASE noise from the linearly polarized optical signal including the unpolarized ASE noise to measure a power of the optical signal and a power of the ASE noise included in a bandwidth of an optical signal; and (c) obtaining the optical signal-to-noise ratio (OSNR) using the measured optical signal power and ASE noise power.

摘要翻译： 本发明涉及一种用于自动监测光信噪比的方法和装置，其中将包括非偏振ASE噪声的任意偏振光信号输入到旋转四分之一波片，然后输入到旋转线性偏振器，使得 可以检测从旋转线性偏振器输出的信号的最大功率和最小功率，并且使用检测到的最大功率和最小功率来自动监测光信噪比。 使用偏振归零方法监测光信噪比（OSNR）的方法包括以下步骤：（a）线性偏振包括非偏振ASE噪声的任意偏振光信号; （b）从包括非偏振ASE噪声的线偏振光信号中分离出光信号和ASE噪声，以测量包括在光信号的带宽中的光信号的功率和ASE噪声的功率; 和（c）使用所测量的光信号功率和ASE噪声功率获得光信噪比（OSNR）。

公开(公告)号：US06188509B1

公开(公告)日：2001-02-13

申请号：US09224774

申请日：1998-01-04

申请人： Chang Hee Lee ,  Yun Chur Chung ,  Chul Han Kim

发明人： Chang Hee Lee ,  Yun Chur Chung ,  Chul Han Kim

IPC分类号： H01S0300

CPC分类号： G02B6/29383 ,  G02B6/12019 ,  H04J14/0216

摘要： This invention is to construct a bidirectional WDM add/drop amplifier module for transmitting WDMS in bidirection and for adding/dropping a signal in bidirection at each node in a WDM network system using a single N×N multiplexer. The bidirectional WDM add/drop amplifier module 100 comprises an 8×8 arrayed-waveguide grating 110. The 8×8 arrayed-waveguide grating 110 has, at each side, a WDMS input end L4 or R4, a WDMS output end L8 or R8, three separated signal input ends L1, L2 and L3, or R5, R6 and R7, and three separated signal output ends L5, L6 and L7, or R1, R2 and R3. One L2 or R6 of the separated signal input ends is designated as an added signal input end, one L6 or R2 of the separated signal output ends is designated as a dropped signal output end, and the separated signal output ends L5 and L7, or R1 and R3 except for the dropped signal output end connected to the signal input ends L1 and L3, or R5 and R7 at the same side. The WDM add/drop amplifier module 100 comprises a circulator 140L, 140R provided at both ends of 8×8 arrayed-waveguide grating 110 to distinguish paths of different WDMSs and to transmit through each path respectively, an unidirectional optical band pass filter 130L or 130R provided between the WDMS output end L8 or R8 of the 8×8 arrayed-waveguide grating 110 and the circulator 140L, 140R to eliminate a relative intensity noise, and a bidirectional signal amplifier 120L or 120R.

摘要翻译： 本发明是构造一个双向WDM分插放大器模块，用于在WDM网络系统中使用单个NxN多路复用器在双向传输WDMS和在双向的每个节点添加/丢弃信号。 双向WDM分插放大器模块100包括8×8阵列波导光栅110.8x8阵列波导光栅110在每侧具有WDMS输入端L4或R4，WDMS输出端L8或R8，三个分离信号 输入端L1，L2和L3或R5，R6和R7，以及三个分离的信号输出端L5，L6和L7，或R1，R2和R3。 分离信号输入端的一个L2或R6被指定为相加信号输入端，分离信号输出端的一个L6或R2被指定为丢弃信号输出端，分离信号输出结束L5和L7，或R1 R3除了与信号输入端L1和L3相连的下降信号输出端，或者在同一侧连接的R5和R7。 WDM分插放大器模块100包括设置在8×8阵列波导光栅110的两端的循环器140L，140R，以区分不同WDMS的路径，并且分别通过每条路径传输单向光学带通滤波器130L或130R， 8×8阵列波导光栅110和循环器140L，140R的WDMS输出端L8或R8，以消除相对强度噪声，以及双向信号放大器120L或120R。