Coherent subcarrier fiber-optic communication systems with phase-noise cancellation

A phase-noise-cancelled coherent subcarrier fiberoptic communication system that uses integrated-optic MachZehnder waveguide modulators for frequency-pair encoding is introduced. Optical double-sideband suppressed-carrier signals with the same random phase noise and information encoded in the frequency separation of the two sidebands are generated by properly biasing the modulator. Phase noise is eliminated at the receiver by a nodhear operation on the two sidebands. System performance analysis with numerid examples, taking into account the modulation index and laser normalized linewidth, is presented.