Differential polarization shift-keying optical transmission system

摘要

A differential polarization shift-keying optical transmission system includes a transmitter unit for precoding inputted data to form a precoded signal and generate a polarization-modulated optical signal using the precoded signal. The system further includes a receiver unit connected with the transmitter unit via an optical fiber for optical transmission. The receiver unit includes a delay interferometer for splitting the optical signal into first and second split optical signals, generating a delayed optical signal by causing the second split signal to be delayed 1 bit, generating a phase-inverted optical signal by inverting the phase of a part of the first split signal, and generating generate constructive-interferential and destructive-interferential optical signals by causing respective parts of the delayed signal to interfere with another part of the first split signal and with the phase-inverted signal. A balanced receiver in the receiver unit outputs a differential signal corresponding to a difference between the constructive-interferential and destructive-interferential optical signals.