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

نویسندگان

  • Lyubomir L Minkov
  • Ivan B Djordjevic
  • Lei Xu
  • Ting Wang
  • Franko Kueppers
چکیده

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.

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عنوان ژورنال:
  • Optics express

دوره 16 17  شماره 

صفحات  -

تاریخ انتشار 2008