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PMD compensation in multilevel coded-modulation schemes with coherent detection using BLAST algorithm and iterative

Ivan B Djordjevic¹, Lei Xu, Ting Wang

¹Department of Electrical and Computer Engineering, University of Arizona, Tucson, AZ 85721, USA. ivan@ece.arizona.edu

|September 17, 2008

Summary

This summary is machine-generated.

Two new polarization mode dispersion (PMD) compensation schemes using LDPC codes improve spectral efficiency in multilevel modulation. These schemes effectively compensate for significant differential group delay with minimal performance penalty.

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Area of Science:

Optical communications
Signal processing

Background:

Polarization mode dispersion (PMD) degrades signal quality in optical fiber systems.
Existing PMD compensation schemes may not be optimal for multilevel modulation formats.

Purpose of the Study:

To develop and evaluate novel PMD compensation schemes for multilevel block-coded modulation.
To enhance spectral efficiency and performance in coherent optical systems.

Main Methods:

Implementation of two PMD compensation schemes: BLAST-type polarization-interference cancellation and iterative polarization cancellation.
Utilizing low-density parity-check (LDPC) codes as channel codes.
Evaluation using coded-orthogonal frequency-division multiplexing (OFDM) with coherent detection.

Main Results:

The proposed schemes, combined with girth-10 LDPC codes, outperform polarization-time coding based OFDM by 1 dB at a bit error rate (BER) of 10(-9).
Achieved two times higher spectral efficiency compared to existing methods.
Demonstrated comparable performance and ability to compensate for up to 1200 ps of differential group delay with negligible penalty.

Conclusions:

The developed PMD compensation schemes are highly effective for multilevel block-coded modulation systems.
These schemes offer significant improvements in spectral efficiency and performance, even under substantial PMD conditions.