Nonlinearity pre-compensation of high order modulation transmissions
AssigneeZte Corporation
InventorsJianjun Yu, Hung-Chang Chien
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Abstract
An optical transmitter apparatus is disclosed. The apparatus includes a processor, a memory coupled to the processor, and one or more programs configured to be executed by the processor. The programs include instructions for nonlinearity estimation that characterizes nonlinearity in an optical communication and estimates an amount of symbol distortion caused by the nonlinearity, instructions for selecting and mapping symbols to provide, for the nonlinearity estimation, only symbols that meet predetermined nonlinearity criteria, and instructions for storing, in the memory, the amount of symbol distortion to be used for a nonlinearity pre-compensation.
Claims20
An optical transmitter apparatus, comprising:
- a processor;
- a memory coupled to the processor;
- and
- one or more programs, wherein the one or more programs are configured to be executed by the processor, the programs including:
- instructions for nonlinearity estimation that characterizes nonlinearity in an optical communication and estimates an amount of symbol distortion caused by the nonlinearity;
- instructions for selecting and mapping symbols to provide, for the nonlinearity estimation, only symbols that meet predetermined nonlinearity criteria;
- and
- instructions for storing, in the memory, the amount of symbol distortion to be used for a nonlinearity pre-compensation.
An optical transmitter apparatus, comprising:
- a symbol mapper that receives data bits to be transmitted and generates multiple symbols containing the data bits therein by mapping the data bits into the symbols;
- and
- a pre-compensator that estimates an amount of symbol distortion caused by nonlinearity in an optical communication to perform a nonlinearity pre-compensation by using the amount of symbol distortion, the pre-compensator comprising:
- a symbol selector that selects certain symbols from the generated multiple symbols that meet predetermined nonlinearity criteria to be used in estimating the amount of symbol distortion.
A method of estimating nonlinearity in an optical communication, comprising:
- mapping a training sequence to a symbol pattern including multiple symbols;
- selecting symbols from the symbol pattern that meet predetermined nonlinearity criteria;
- and
- estimating an amount of symbol distortion caused by the nonlinearity based only on the symbols that meet the predetermined nonlinearity criteria.
Dependencies are inferred from the claim text.