Abstract
The performance of rate-0.8 4-ary LDPC code has been studied in a 50GHz-spaced 40Gb/s DWDM system with PDM-QPSK modulation. The net effective coding gain of 10dB is obtained at BER of 10-6. With the aid of time-interleaving polarization multiplexing and MAP detection, 10,560km transmission over legacy dispersion managed fiber is achieved without any countable errors. The proposed nonbinary quasi-cyclic LDPC code achieves an uncoded BER threshold at 4×10-2. Potential issues like phase ambiguity and coding length are also discussed when implementing LDPC in current coherent optical systems.
Original language | English (US) |
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Pages (from-to) | 19042-19049 |
Number of pages | 8 |
Journal | Optics Express |
Volume | 19 |
Issue number | 20 |
DOIs | |
State | Published - Sep 26 2011 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics