Patent ID: 9559784
Date: 2017-01-31
CPC Classifications: H04B

Claim:
1. An optical communications method for receiving and processing an optical signal at an optical receiver, comprising: receiving an optical Nyquist Frequency Division Multiplexing (NFDM) signal comprising a first polarization component and a second polarization component that is differently polarized with respect to the first polarization component, wherein each of the first and second polarization components include multiple subchannels, each subchannel comprising a carrier modulated with a corresponding modulation scheme; separating the received optical NFDM signal into a plurality of received signal components, each received signal component corresponding to a different one of the multiple subchannels; and processing the plurality of received signal components through a plurality of receive chains, wherein each receive chain includes a carrier recovery stage that adaptively recovers carrier information according to a bit-loading level of each subchannel and a re-timing stage that generates timing information for demodulation of the optical NFDM signal.