Title :
Multilevel coding in M-ary DPSK/differential QAM high-speed optical transmission with direct detection
Author :
Djordjevic, Ivan B. ; Vasic, Bane
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Arizona, Tucson, AZ, USA
Abstract :
A bandwidth- and power-efficient modulation scheme using M-ary differential phase-shift keying (DPSK)/differential quadrature amplitude modulation (DQAM) and low-density parity-check (LDPC) codes as component codes in a multilevel coding (MLC) is proposed for optical transmission systems with direct detection. An MLC scheme with 2 b/s/Hz spectral efficiency based on block-circulant component codes provides the coding gain of 12.3 dB when compared to uncoded 8-DPSK, and 8.3 dB when compared to uncoded 4-DPSK (QDPSK).
Keywords :
differential phase shift keying; optical fibre communication; optical modulation; parity check codes; quadrature amplitude modulation; 12.3 dB; 8.3 dB; DQAM; M-ary DPSK; differential phase-shift keying; differential quadrature amplitude modulation; direct detection; low-density parity-check codes; multilevel coding; Amplitude modulation; Differential phase shift keying; Differential quadrature phase shift keying; High speed optical techniques; Modulation coding; Optical devices; Optical modulation; Parity check codes; Phase modulation; Quadrature amplitude modulation; Differential quadrature amplitude modulation (DQAM); Mach–Zehnder interferometer; low-density parity-check codes (LDPC); multilevel coding; optical communications;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2005.860148
