Evaluation of large girth LDPC codes for PMD compensation by turbo equalization

Lyubomir L. Minkov, Ivan B. Djordjevic, Lei Xu, Ting Wang, Franko Kueppers

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Large-girth quasi-cyclic LDPC codes have been experimentally evaluated for use in PMD compensation by turbo equalization for a 10 Gb/s NRZ optical transmission system, and observing one sample per bit. Net effective coding gain improvement for girth-10, rate 0.906 code of length 11936 over maximum a posteriori probability (MAP) detector for differential group delay of 125 ps is 6.25 dB at BER of 10-6. Girth-10 LDPC code of rate 0.8 outperforms the girth-10 code of rate 0.906 by 2.75 dB, and provides the net effective coding gain improvement of 9 dB at the same BER. It is experimentally determined that girth-10 LDPC codes of length around 15000 approach channel capacity limit within 1.25 dB.

Original languageEnglish (US)
Pages (from-to)13450-13455
Number of pages6
JournalOptics Express
Issue number17
StatePublished - Aug 18 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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