CONTROL OF LO SIGNAL FREQUENCY OFFSET BETWEEN OPTICAL TRANSMITTERS AND RECEIVERS

摘要

In an optical receiver, an optical local oscillator (LO) frequency is generated. A modulated optical frequency is received at the optical receiver. An LO-signal frequency offset between the received modulated optical frequency and the optical LO frequency is determined. A determination is made as to whether the LO-signal frequency offset is in one of multiple predefined non-overlapping target windows that cover respective non-zero LO-signal frequency offsets. If it is determined that the LO-signal frequency offset is not in one of the target windows, the optical LO frequency is tuned to drive the LO-signal frequency offset toward one of the target windows to ensure the LO-signal frequency offset is non-zero.

主权项

1. A method comprising:
in an optical receiver:
generating an optical local oscillator (LO) frequency;receiving a modulated optical frequency;determining a LO-signal frequency offset between the received modulated optical frequency and the optical LO frequency;determining whether the LO-signal frequency offset is in one of multiple predefined non-overlapping target windows that cover respective non-zero LO-signal frequency offsets; andif the LO-signal frequency offset is determined not to be in one of the target windows, tuning the optical LO frequency to drive the LO-signal frequency offset toward one of the target windows to ensure the LO-signal frequency offset is non-zero.