Open AccessTiming Recovery Algorithm Selection for Duo-Binary Signal Used in Next Generation 25G-EPON
Author(s) -
Junqi Xia,
Yingchun Li,
Tingting Xu,
Jian Chen,
Yingxiong Song
Publication year - 2017
Publication title -
ieee photonics journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.725
H-Index - 73
eISSN - 1943-0655
pISSN - 1943-0647
DOI - 10.1109/jphot.2017.2719718
Subject(s) - engineered materials, dielectrics and plasmas , photonics and electrooptics
Low complexity and effective symbol timing recovery (STR) algorithm is a serious challenge for high speed NG-EPON system with 25 Gb/s serial bit-rate per channel. In this paper, the frequently used nonlinear function based timing algorithms are compared in 25 Gb/s Duo-binary transmission system through simulation and experiment. Both simulation and experiment results show that absolute-law based STR (AL-STR) algorithm has minimum timing jitter and lowest computational complexity for Duo-binary receiver. The jitter of STR caused by the nonideal Duo-binary signal is also investigated by simulating different bandwidths of the commercial 10G optical devices. Results show that there are only little effect on STR performance when the -3 dB bandwidth changes from 6 to 8.75 GHz. Maximum likelihood sequence estimation (MLSE), linear and nonlinear equalizer are, respectively, performed after STR in 10G optics-based 25 Gb/s Duo-binary receiver. An optical power sensitivity of -25.6 dBm can be obtained with AL-STR and MLSE.