| 摘要 |
<p>The quality of a multi-channel signal launched into an optical fiber may be degraded by active device distortion as well as non-linear fiber effects. Active device distortion in the form of clipping distortion and interferometric noise are reduced by a laser bias control circuit (1) that does not require significant delay of the main RF signal. An information carrying signal (5), with periodic high amplitude peaks, drives the RF input (6) of a laser (7) as well as the input of a laser bias control circuit (9). The laser bias control circuit (1) directly modulates the laser with a low frequency signal that is proportional to the frequency of occurrence and intensity of peaks in the information carrying signal that are likely to cause the laser to clip.</p> |
