Patent ID: 8611751
Filing Date: 2013-12-17
Classification: H04B,H04J

Abstract:
1. An apparatus, comprising: an optical receiver for receiving a modulated optical carrier comprising a polarization-multiplexed (PMUX) return-to-zero (RZ) pulse stream having first and second polarization components bearing respective first and second phase-shift keying (PSK) modulated data streams, the optical receiver comprising: a first polarization-independent optical delay interferometer (ODI) to provide an optical signal associated with in-phase data tributaries of each of said first and second PSK modulated data streams to a first balanced optical detector; a first electrical decision circuit, coupled to said first balanced optical detector, for extracting said in-phase data tributaries of each of said first and second PSK modulated data streams; a second polarization-independent ODI to provide an optical signal associated with quadrature-phase data tributaries of each of said first and second PSK modulated data streams to a second balanced optical detector; and a second electrical decision circuit, coupled to said second balanced optical detector, for extracting said quadrature-phase data tributaries of each of said first and second PSK modulated data streams.