Patent ID: 9088365
Filing Date: 2015-07-21
Classification: H04B

Abstract:
1. An optical transmission system comprising: a transmitter for transmitting an optical signal; a phase conjugate copier for generating a phase conjugate duplicate of an original optical signal called idler components; a transmission link coupled to an output from the phase conjugate copier; coherence receivers coupled to the transmission link for separately receiving the optical signal and the idler components, respectively; and a digital signal processor for receiving the separated optical signal and idler components for conjugating in phase the idler signal and adding it to the received optical signal in a digital domain enabling nonlinear phase shifts on the optical signal and idler components to cancel out each other; wherein at the receivers, the signal and idler components are separated by an optical filter and launched into two coherent receivers and the demodulated electrical QPSK signal and idler from the coherent receivers are fed into a digital signal processor DSP module, where chromatic dispersion CD, polarization mode dispersion PMD and frequency offset between signals and local oscillators LOs are electronically compensated.