Open AccessDigital pilot aided carrier frequency offset estimation for coherent optical transmission systems
Author(s) -
Deshuang Zhao,
Lixia Xi,
Xianfeng Tang,
Wenbo Zhang,
Yaojun Qiao,
Xiaoguang Zhang
Publication year - 2015
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.024822
Subject(s) - computer science , polarization mode dispersion , pilot signal , offset (computer science) , optics , transmission (telecommunications) , electronic engineering , frequency offset , modulation (music) , residual , telecommunications , physics , orthogonal frequency division multiplexing , acoustics , engineering , algorithm , optical fiber , programming language , channel (broadcasting)
We present a digital pilot aided carrier frequency offset estimation (FOE) method for coherent optical transmission systems. Unlike the conventional pilot tone insertion scheme, the pilot of the proposed method is generated in a digital manner and can serve as a good FOE indicator. Aided by this kind of digital pilot, the FOE is implemented by determining the location of the digital pilot in the spectrum. Theoretical analysis and numerical simulations show that the proposed method has the advantages in wide range, high accuracy, modulation formats independent, no need to remove the modulation, and high tolerance to the residual chromatic dispersion (CD) and polarization mode dispersion (PMD).