Method and apparatus for sub-carrier frequency control

摘要

The invention pertains to methods, apparatus, and systems for controlling the sub-carrier frequencies in an optical frequency division multiplex communication system by using a metric available from the sub-carrier modem's digital receive block as an indicator of cross-talk between sub-carriers and adjusting the sub-carrier frequency separation as a function of that metric.

主权项

1. A method implemented in a modem for sub-carrier frequency control in a system that uses at least a first sub-carrier frequency and a second sub-carrier frequency, the method comprising:
responsive to receiving signals on each of the first sub-carrier frequency and the second sub-carrier frequency, determining a metric indicative of frequency separation between the first sub-carrier frequency and the second sub-carrier frequency based on digital processing of the signals on each of the first sub-carrier frequency and the second sub-carrier frequency; controlling a frequency of at least one of the first sub-carrier frequency and the second sub-carrier frequency based on the metric; and processing the received signals on each of the first sub-carrier frequency and the second sub-carrier frequency at a common data processing equipment in the modem.