Transmission system comprising a CS-RZ DPSK optical transmitter

摘要

The present invention suppresses to a minimum the degradation of the transmission quality caused by chromatic dispersion characteristic of an optical transmission medium, and the interplay between the chromatic dispersion and nonlinear optical effects in dense WDM transport systems. A baseband input data signal is pre-coded in advance by a pre-coding unit (2), a dual mode beat pulse light source is adapted to generate two longitudinal modes which synchronize with a data signal, and phase modulation is carried out using a pre-coded signal by the optical phase modulating unit (3) to generate a CS-RZ DPSK optical signal. The phase modulated optical signal is converted at the receiver to an RZ intensity modulated signal by the optical filter unit (5) that performs phase-shift-keying to amplitude-shift-keying conversion.