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

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...

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Bibliographic Details
Published in:IEEE photonics journal 2014-08, Vol.6 (4), p.1-8
Main Authors: Zhao, Donghe, Xi, Lixia, Tang, Xianfeng, Zhang, Wenbo, Qiao, Yaojun, Zhang, Xiaoguang
Format: Article
Language:English
Subjects:
Coherence
Correlation
Monitoring
Multiplexing
Noise levels
Optical fibers
Optical noise
Optical polarization
Polarization
Robustness
Signal to noise ratio
Training
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Summary: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.
ISSN:1943-0655
1943-0647
DOI:10.1109/JPHOT.2014.2339319