Nonbinary LDPC coded modulation without bandwidth expansion for high-speed optical transmission

摘要

Systems and methods for data transport, comprising encoding one or more streams of input data using nonbinary low density parity check (NB-LDPC) encoders, corresponding to orthogonal polarization states. Receiving one or more streams of input data using a buffer coupled to the encoders, the data written to the buffer bR bits at a time, where R is the code rate. Generating one or more signals using a 2b-ary mapper implemented as a look-up table (LUT) to store coordinates of a corresponding signal constellation, the 2b-ary mapper configured to assign bits of one or more signals to a signal constellation and to associate the bits of the signals with signal constellation points, wherein the constellation is expanded to avoid bandwidth expansion due to coding, generating substantial net coding gains within a same bandwidth. Modulating nonbinary LDPC-coded data streams using in-phase/quadrature (I/Q) modulators and multiplexing the data streams using polarization beam combiner.

主权项

1. A method for data transport, comprising:
encoding one or more streams of input data using at least two nonbinary low density parity check (NB-LDPC) encoders, corresponding to two orthogonal polarization states; receiving the one or more streams of input data using a buffer coupled to the at least two encoders, the input data being written to the buffer bR bits at a time, where R is the code rate; generating one or more signals using a 2b-ary mapper implemented as a look-up table (LUT) to store coordinates of a corresponding signal constellation, the 2b-ary mapper configured to assign bits of one or more signals to a signal constellation and to associate the bits of the one or more signals with signal constellation points, wherein the signal constellation is expanded to avoid bandwidth expansion due to coding, thereby generating a net coding gain within a same bandwidth; modulating the output of the mapper onto a transmission medium by using at least one in-phase/quadrature (I/O) modulator; and multiplexing two independent nonbinary LDPC-coded data streams using a polarization beam combiner.