Adaptively coding and modulating signals transmitted via nonlinear channels
First Claim
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1. An optical communications network, comprising:
- an optical transmitter, further comprising;
a forward error correction (FEC) encoder;
a precoder; and
a modulator;
an optical receiver, further comprising;
a detector;
a FEC decoder;
a decision block; and
an error check block;
an optical fiber connecting the optical transmitter and the optical receiver;
a first analyzer, connected between the optical transmitter and the optical receiver, configured to generate an extrinsic information transfer (EXIT) chart, and adapting the FEC encoder according to the EXIT chart; and
a second analyzer, connected between the optical transmitter and the optical receiver, configured to generate nonlinear statistics of an optical channel in the optical fiber between the optical transmitter and the optical receiver, and adapting, the precoder and the modulator according to the nonlinear statistics.
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Abstract
An adaptive coding scheme for nonlinear channels improves reliability and an efficiency in digital communication networks. The method monitors channel statistics to analyze an extrinsic information transfer chart of the channels. The channel statistics are fed back to the transmitter to adapt forward error correction coding. A parametric analysis method uses a Gaussian mixture model. The statistical information feedback can adapt an ARQ sheme by adding a weighted received signal to the original coded signals to reduce nonlinear distortion. Trellis shaping can make the transmitting signal preferable for nonlinear channels.
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Citations
8 Claims
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1. An optical communications network, comprising:
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an optical transmitter, further comprising; a forward error correction (FEC) encoder; a precoder; and a modulator; an optical receiver, further comprising; a detector; a FEC decoder; a decision block; and an error check block; an optical fiber connecting the optical transmitter and the optical receiver; a first analyzer, connected between the optical transmitter and the optical receiver, configured to generate an extrinsic information transfer (EXIT) chart, and adapting the FEC encoder according to the EXIT chart; and a second analyzer, connected between the optical transmitter and the optical receiver, configured to generate nonlinear statistics of an optical channel in the optical fiber between the optical transmitter and the optical receiver, and adapting, the precoder and the modulator according to the nonlinear statistics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification