Efficient computation and compensation of linear and nonlinear distortion in dispersion-managed fiber-opic transmission
AssigneeUniversity of Central Florida Research Foundation, Inc.
InventorsGuifang Li, Likai Zhu
Life of this patent
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Abstract
In one embodiment, a method for performing nonlinearity compensation on a dispersion-managed optical signal that was transmitted over an optical communication link, the method including virtually dividing the communication link into a plurality of steps, performing lumped dispersion compensation on a received optical signal to obtain a waveform upon which digital backward propagation (DBP) can be performed, performing DBP by performing dispersion compensation and nonlinearity compensation for each step, and generating an estimate of the transmitted signal based upon the performed DBP.
Claims14
A method for performing nonlinearity compensation on an optical signal that was transmitted over a dispersion-managed optical communication link, the method comprising:
- a processor virtually dividing the communication link into one or more segments, each segment comprising a plurality of spans, and virtually dividing each span into a plurality of distance steps, each distance step representing a fraction of the length of its span;
- for each segment of the communication link:
- performing lumped dispersion compensation on a received optical signal for a first group of spans of the segment to obtain a waveform upon which digital backward propagation (DBP) can be performed, performing DBP for a further span of the segment and performing lumped dispersion compensation for the remaining spans of the segment;
- and generating an estimate of the transmitted signal based upon the performed DBP.
A method for performing nonlinearity compensation on an optical signal that was transmitted over a dispersion-managed optical communication link, the method comprising:
- a processor virtually dividing the communication link into one or more segments that each comprise a plurality of dispersion steps that represent particular ranges of accumulated dispersion of spans of the segment;
- for each segment of the communication link:
- calculating a weighting factor for each dispersion step of the segment, the weighting factors accounting for different power levels across the segment;
- performing lumped dispersion compensation to obtain a waveform for a first dispersion step of the segment, and performing digital backward propagation (DBP) for each dispersion step of the segment with the nonlinearity being multiplied by the weighting factor for the dispersion step;
- and generating an estimate of the transmitted signal based upon the performed DBP.
A component for use in a dispersion-managed optical communication link, the component comprising:
- logic configured to virtually divide the communication link into one or more segments, each segment comprising a plurality of spans, and to divide the spans into a plurality of distance steps, each distance step representing a fraction of the length of its span;
- logic configured to perform lumped dispersion compensation on a received optical signal for a first group of spans of the segment to obtain a waveform upon which digital backward propagation (DBP) can be performed;
- logic configured to perform DBP for a further span of the segment by performing dispersion compensation and nonlinearity compensation with the nonlinearity multiplied by the number of spans in the segment for each step of the span;
- logic configured to perform lumped dispersion compensation for the remaining spans of the segment;
- and
- logic configured to generate an estimate of the transmitted signal based upon the performed DBP.
A component for use in a dispersion-managed optical communication link, the component comprising:
- logic configured to virtually divide the communication link into one or more segments that each comprise a plurality of dispersion steps that represent particular ranges of accumulated dispersion;
- logic configured to calculate a weighting factor for each dispersion step of a segment, the weighting factors accounting for different power levels across the segment;
- logic configured to perform lumped dispersion compensation to obtain a waveform for the first dispersion step,
- logic configured to perform digital backward propagation (DBP) for each dispersion step of the segment with the nonlinearity being multiplied by the weighting factor for the dispersion step;
- and
- logic configured to generate an estimate of the transmitted signal based upon the performed DBP.
Dependencies are inferred from the claim text.