公开(公告)号：US06597482B1

公开(公告)日：2003-07-22

申请号：US09250212

申请日：1999-02-15

申请人： Yun Chur Chung ,  Chang Hee Lee ,  Dae Kwang Jung ,  Seung Kyun Shin

发明人： Yun Chur Chung ,  Chang Hee Lee ,  Dae Kwang Jung ,  Seung Kyun Shin

IPC分类号： H04J1402

CPC分类号： H04J14/02

摘要： A multiplexing/demultiplexing apparatus used in wavelength division multiplexed passive optical subscriber networks comprises a multiplexing/demultiplexing means each having a natural number N input and output ports, wherein wavelength divided signals in one direction inputted through the N−1 input ports are multiplexed onto one output port, and simultaneously wavelength division multiplexed signals in the other direction inputted through the remainder one input port are demultiplexed onto the remainder N−1 output ports. According to the present invention it is possible to implement economical and efficient wavelength division multiplexed passive optical subscriber networks, by including two WGR's, one at the central office and one at the remote node to perform simultaneous multiplexing and demultiplexing of signals in upstream and downstream, and employing an erbium-doped fiber amplifier to be able to use a low-cost light source such as a light-emitting diode.

摘要翻译： 在波分复用无源光用户网络中使用的复用/解复用装置包括：具有自然数N个输入和输出端口的复用/解复用装置，其中通过N-1个输入端口输入的一个方向上的波长分割信号被多路复用到一个 输出端口，并且通过其余一个输入端口输入的另一方向的同时波分复用信号被解复用到剩余的N-1个输出端口。 根据本发明，通过包括两个WGR，一个在中心局和一个在远程节点处，实现经济有效的波分复用无源光用户网络，以执行上行和下行信号的同时复用和解复用， 并且使用掺铒光纤放大器能够使用诸如发光二极管的低成本光源。

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：US06548806B1

公开(公告)日：2003-04-15

申请号：US09517789

申请日：2000-03-02

申请人： Yun Chur Chung ,  Seung Kyun Shin ,  Keun Joo Park

发明人： Yun Chur Chung ,  Seung Kyun Shin ,  Keun Joo Park

IPC分类号： G01N2125

CPC分类号： H04J14/02 ,  H04B10/0775 ,  H04B2210/075

摘要： An apparatus monitoring frequency of WDM signals using pilot tone and two interleaved solid etalon filters for efficient management and maintenance of wavelength division multiplexing optical transmission network is provided. Desirably, the apparatus for optical frequency monitoring includes splitting means, a plurality of optical filtering means, optical detecting means, and frequency detecting means. The splitting means splits optical signal and the optical signal includes pilot tone. The plurality of optical filtering means filters an output of the splitting means with particular passband. The optical detecting means converts an output of the optical filtering means into electrical signal. The frequency detecting means detects an intensity of the pilot tone from an output of the optical detecting means and calculates optical frequency.

摘要翻译： 提供了使用导频音频的WDM信号的监视频率和用于波分复用光传输网络的有效管理和维护的两个交错固体标准具滤波器。 期望地，用于光频率监视的装置包括分割装置，多个光学滤波装置，光学检测装置和频率检测装置。 分离装置分割光信号，光信号包括导频音。 多个光学滤波装置以特定的通带对分离装置的输出进行滤波。 光检测装置将光滤波装置的输出转换为电信号。 频率检测装置从光学检测装置的输出检测导频的强度，并计算光频率。

公开(公告)号：US06433864B1

公开(公告)日：2002-08-13

申请号：US09626017

申请日：2000-07-26

申请人： Yun Chur Chung ,  Seung Kyun Shin ,  Keun Joo Park

发明人： Yun Chur Chung ,  Seung Kyun Shin ,  Keun Joo Park

IPC分类号： G01N2100

CPC分类号： H04B10/07955 ,  H04B10/077 ,  H04J14/02

摘要： The optical signal-to-noise ratio (OSNR) of optical signals that are demultiplexed into a plurality of optical channels by a wavelength-division multiplexing (WDM) optical transmission system is monitored by an apparatus which outputs the optical signals of each optical channel on a first path and a second path, and measures the signal intensity of each of the optical signals on the first path. The apparatus selectively passes an AC component of each of the optical signals on the second path and processes the AC component by converting the AC component into a digital signal and performing a fast fourier transform on the digital signal. The apparatus measures the noise intensity of the processed AC component on the second path. The OSNR of each optical signal is calculated by comparing the measured signal intensity of each of the optical signals and the measured noise intensity of the processed AC component of each of the optical signals.

摘要翻译： 通过波分复用（WDM）光传输系统解复用为多个光通道的光信号的光信噪比（OSNR）由输出每个光信道的光信号的设备监测 第一路径和第二路径，并且测量第一路径上的每个光信号的信号强度。 该装置选择性地通过第二路径上的每个光信号的AC分量，并且通过将AC分量转换成数字信号并对数字信号执行快速傅里叶变换来处理AC分量。 该装置测量第二路径上经处理的AC分量的噪声强度。 通过比较每个光信号的测量信号强度和每个光信号的经处理的AC分量的测量噪声强度来计算每个光信号的OSNR。