Patent ID: 8693890
Filing Date: 2014-04-08
Classification: H04B

Abstract:
1. A method to process an optical signal, comprising: generating a symbol pattern in accordance with predetermined rules; pre-processing the symbol pattern with non-linearity compensation to fill a look-up table in an off-line mode; applying said predetermined rules to single channel input data for self-phase modulation (SPM) compensation or multiple channel input data for cross-phase modulation (XPM) compensation to generate a real-time symbol pattern; searching the look-up table with the real-time symbol pattern to determine a non-linearity compensation output; comparing one or more input symbol patterns with the look-up table to find corresponding optimal output symbols, wherein the optimal output symbols are sent to a digital-to-analog converter (DAC) array, converted to analog signals; and modulating the optical signal with the compensation output and the analog signals.