公开(公告)号：US07734186B2

公开(公告)日：2010-06-08

申请号：US10490039

申请日：2002-09-17

申请人： Marc Francis Charles Stephens ,  Steven Alleston ,  Nicholas John Doran

发明人： Marc Francis Charles Stephens ,  Steven Alleston ,  Nicholas John Doran

IPC分类号： H04B10/00

CPC分类号： H04B10/2916 ,  H01S3/302

摘要： A method of reducing Raman tilt in a transmission apparatus capable of transmitting a plurality of signals, occupying contiguous channels in a transmission band, through a length of optical transmission cable which exhibits the Raman effect of transferring energy from the shorter wavelength signals at one end of the transmission band towards the longer wavelength signals at the other end of the transmission band, including the transmission of half the maximum number of signals at twice the normal channel frequency spacing at a higher-than-normal level and the transmission signals in selected ones, fewer than all, of the available channels at the normal channel spacing at a normal power level. As new channels are added at the lower frequency channel spacing, the powers of both neighboring channels are reduced to the normal power level.

摘要翻译： 一种降低传输装置中的拉曼倾斜的方法，该传输装置能够通过一长度的光传输电缆传输多个信号，占据传输频带中的连续信道，该长度的光传输电缆显示出拉曼效应，该效应从短波长信号的一端传输能量 传输频带朝向传输频带另一端的较长波长的信号，包括以高于正常电平的两倍于正常信道频率间隔的传输信号的最大数量的一半，以及所选信号中的传输信号， 在正常功率水平下以正常信道间隔的可用信道少于全部。 由于在较低的频道间隔增加了新的频道，所以两个相邻频道的功率降低到正常功率电平。

公开(公告)号：US20090142052A1

公开(公告)日：2009-06-04

申请号：US11719190

申请日：2005-11-10

申请人： Steven Pegg ,  Marc Francis Charles Stephens ,  Robert Richard Packham ,  Andrew Straw

发明人： Steven Pegg ,  Marc Francis Charles Stephens ,  Robert Richard Packham ,  Andrew Straw

IPC分类号： H04B10/08 ,  H04J14/02

CPC分类号： H04B10/077 ,  H04B10/07955 ,  H04J14/02 ,  H04J14/0221

摘要： An apparatus and method for monitoring of optical signals 60 at a node (12, 14, 16) in a WDM telecommunications system 10 comprising the employment of photodiodes (54, 56, 58). Each of the photodiodes (54, 56, 58) has a short response time relative to a number of bit periods of the optical signal to permit measurement of the optical power thereof. Such a photodiode (54, 56, 58) can be used to monitor many nodes (12, 14, 16) within the system 10 and facilitates monitoring of optical signals in nodes which are far apart. The photodiode (54, 56, 58) also permits the Optical Signal to Noise Ratio (OSNR) of the optical signal 60 to be calculated by obtaining values for a maximum optical power P1 and a minimum optical power P0 for a particular optical signal 60.

摘要翻译： 一种在WDM电信系统10中的节点（12,14,16）处监视光信号60的装置和方法，包括使用光电二极管（54,56,58）。 每个光电二极管（54,56,58）相对于光信号的位数周期具有短的响应时间，以允许测量其光功率。 可以使用这种光电二极管（54,56,58）来监视系统10内的许多节点（12,14,16），并且便于监视距离较远的节点中的光信号。 光电二极管（54,56,58）还允许通过获得特定光信号60的最大光功率P1和最小光功率P0的值来计算光信号60的光信噪比（OSNR）。