title: Experimental study of non-binary LDPC coding for long-haul coherent optical QPSK transmissions.
abstract: The performance of rate-0.8 4-ary LDPC code has been studied in a 50 GHz-spaced 40 Gb/s DWDM system with PDM-QPSK modulation. The net effective coding gain of 10 dB is obtained at BER of 10(-6). With the aid of time-interleaving polarization multiplexing and MAP detection, 10,560 km 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.
authors: NEC Laboratories America, Inc., Princeton, NJ 08540, USA.
authors: Shaoliang
authors: S
authors: Zhang
authors: Murat
authors: M
authors: Arabaci
authors: Fatih
authors: F
authors: Yaman
authors: Ivan B
authors: IB
authors: Djordjevic
authors: Lei
authors: L
authors: Xu
authors: Ting
authors: T
authors: Wang
authors: Yoshihisa
authors: Y
authors: Inada
authors: Takaaki
authors: T
authors: Ogata
authors: Yasuhiro
authors: Y
authors: Aoki
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D005336:Fiber Optic Technology / Q000379:methods*; D008872:Microwaves; D055096:Optical Devices; D055100:Optical Fibers; D012815:Signal Processing, Computer-Assisted; D013685:Telecommunications / Q000295:instrumentation*