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1. 发明授权

US5949560A Optical transmission system 失效
标题翻译：光传输系统
公开(公告)号：US5949560A
公开(公告)日：1999-09-07
申请号：US795684
申请日：1997-02-05
申请人： Kim Byron Roberts , Alan Robinson , Richard Edward Epworth , Henry John Harvey
发明人： Kim Byron Roberts , Alan Robinson , Richard Edward Epworth , Henry John Harvey
IPC分类号： G01M11/02 , H04B3/46 , H04B10/02 , H04B10/08 , H04B10/135 , H04B10/18 , H04B10/00
CPC分类号： H04B10/2572 , H04B10/07951 , H04B10/2569
摘要： An Optical Transmission System includes a monitor for outputting monitored data representative of the extent to which an optical signal is degraded by polarization mode dispersion. The monitor measures the degree of depolarization present in a sample of the optical signal derived from an optical tap, the depolarization being associated with polarization variation at the bit rate frequency of a signal data stream carried by the optical signal. The monitored data is used to control operation of the system to reroute the optical path taken by the optical signal in the event of a threshold level of polarization mode dispersion being exceeded. A transmitter of the optical signal may also be controlled to minimize polarization mode dispersion by varying the polarization state of the optical signal at launch so as to reduce the measured monitor data. The monitor functions during normal transmission of optical signals without the need for shutting down links of the system for measurement purposes. The invention has particular application to long haul optical transmissions of data streams at 10 Gb/sec or more.
摘要翻译：光传输系统包括用于输出表示通过偏振模色散使光信号劣化程度的监视数据的监视器。监视器测量从光学抽头导出的光学信号的样本中存在的去极化程度，去极化与由光信号携带的信号数据流的比特率频率处的偏振变化相关联。所监视的数据用于控制在超过极化模式色散的阈值水平的情况下系统重新路由由光信号拍摄的光路的操作。也可以通过改变发射时的光信号的偏振状态来控制光信号的发射器，以使偏振模色散最小化，从而减少测量的监视数据。监视器在光信号的正常传输期间起作用，而不需要关闭系统的链路用于测量目的。本发明特别适用于10Gb /秒以上的数据流的长距离光传输。

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