Method of demodulating a phase modulated optical signal

摘要

Proposed is a method of demodulating a phase modulated optical signal received from an optical channel. A time-discrete electrical signal is derived from the phase modulated optical signal, using a local optical signal, which has a frequency that is essentially equal to a carrier frequency of the phase modulated optical signal. A phase error between the local optical signal and the phase modulated optical signal is compensated, by deriving from the local optical signal a phase offset and modifying the derived time-discrete electrical signal by this phase offset. A chromatic dispersion caused by the optical channel is compensated, by filtering the modified time-discrete electrical signal using a digital filter.

主权项

1. A method for demodulating a phase modulated optical signal received from an optical channel, comprising the steps of:
deriving a time-discrete electrical signal from the phase modulated optical signal using a local optical signal which has a frequency that is essentially equal to a frequency of a carrier optical signal of the phase modulated optical signal; compensating for a phase error between the local optical signal and the carrier optical signal by deriving from the local optical signal a phase offset, and modifying the time-discrete electrical signal by the phase offset to produce a modified time-discrete electrical signal; and compensating for a chromatic dispersion caused by the optical channel by filtering the modified time-discrete electrical signal using a digital filter.