System, method and apparatus for high-sensitivity optical detection

摘要

An apparatus receives data encoded in a format where information bits for transmission are mapped into symbols each carrying a plurality of bits, some of which are encoded through a frequency-shift keyed (FSK) format and the rest of which are encoded through an additional modulation format on at least one FSK carrier. The receiver detects the signal through a dual-polarization coherent receiver front-end, and recovers polarization components of the signal by decoding a first non-zero portion of a plurality of bits carried by a symbol based on frequency slot position of at least one FSK carrier in the polarization components and a second non-zero portion of the plurality of bits carried by the symbol based on the additional modulation carried by at least one FSK carrier in the polarization components. Pilot-assisted orthogonal frequency-division de-multiplexing (PA-OFDM) may be used for spectrally-efficient signal reception, even in the presence of severe FSK errors.

主权项

1. An optical communication method, comprising:
detecting a signal including a symbol with at least one frequency-shift keyed (FSK) carrier having additional modulation through a dual-polarization coherent receiver front-end; and recovering polarization components of the detected signal, wherein recovering comprises:
decoding a first non-zero portion of a plurality of bits carried by a symbol based on frequency position of the at least one FSK carrier having additional modulation in the polarization components; anddecoding a second non-zero portion of the plurality of bits carried by the symbol based on the additional modulation carried by the at least one FSK carrier in the polarization components.