公开(公告)号：EP0812075A3

公开(公告)日：2000-03-15

申请号：EP97303261.8

申请日：1997-05-13

申请人： NORTEL NETWORKS CORPORATION

发明人： Roberts, Kim Bryron

IPC分类号： H04B10/18 ,  H04B10/08

CPC分类号： H04B10/2513

摘要： An optical transmission system includes means for measuring optical dispersion in the optical path, and a controllable element such as a dispersion compensator, operable in dependence on the measured value of dispersion. A low frequency dither on the optical signal causes timing jitter which varies according to the dispersion in the optical path. The timing jitter is extracted from a clock signal recovered from the optical signal. This jitter is correlated with the original dither to remove jitter effects caused by other mechanisms. Thus a value for dispersion is derived which can be used for monitoring or control purposes.