Periodic Training Sequence Aided In-Band OSNR Monitoring in Digital Coherent Receiver

Author

Donghe Zhao ; Lixia Xi ; Xianfeng Tang ; Wenbo Zhang ; Yaojun Qiao ; Xiaoguang Zhang

Author_Institution

State Key Lab. of Inf. Photonics & Opt. Commun., Beijing Univ. of Posts & Telecommun., Beijing, China

Volume

6

Issue

4

fYear

2014

fDate

Aug. 2014

Firstpage

1

Lastpage

8

Abstract

We propose and demonstrate a new data-aided in-band optical-signal-to-noise ratio (OSNR) monitoring method, which employs the periodic property of a specially designed short training sequence to differentiate the signal power from noise and is proved to be insensitive to the first-order polarization mode dispersion (PMD). This method is verified in a typical 112-Gb/s polarization multiplexed-quadrature phase shift keying and a 224-Gb/s polarization multiplexed-16 quadrature amplitude modulation coherent optical transmission system. The results show that the method is highly accurate, with the monitoring error less than 1 dB in the OSNR range of 7-30 dB under different linewidths and has good robustness to a large amount of residual accumulated CD and first-order PMD.

Keywords

light coherence; multiplexing; optical fibre communication; optical fibre dispersion; optical fibre polarisation; optical receivers; quadrature amplitude modulation; quadrature phase shift keying; PMD; bit rate 112 Gbit/s; bit rate 224 Gbit/s; data-aided in-band optical-signal-to-noise ratio; digital coherent receiver; first-order polarization mode dispersion; in-band OSNR monitoring; optical-signal-to-noise ratio; periodic training sequence; polarization multiplexed-16 quadrature amplitude modulation coherent optical transmission system; polarization multiplexed-quadrature phase shift keying; Correlation; Monitoring; Optical fibers; Optical noise; Optical polarization; Signal to noise ratio; Fiber optics systems; OSNR; coherent communication; training sequence;

fLanguage

English

Journal_Title

Photonics Journal, IEEE

Publisher

ieee

ISSN

1943-0655

Type

jour

DOI

10.1109/JPHOT.2014.2339319

Filename

6857332