Phase Noise Cancellation in Coherent Communication Systems Using a Radio Frequency Pilot Tone

Tianhua Xu; Cenqin Jin; Shuqing Zhang; Gunnar Jacobsen; Sergei Popov; Mark Leeson; Tiegen Liu

doi:10.3390/app9214717

Applied Sciences (Nov 2019)

Phase Noise Cancellation in Coherent Communication Systems Using a Radio Frequency Pilot Tone

Tianhua Xu,
Cenqin Jin,
Shuqing Zhang,
Gunnar Jacobsen,
Sergei Popov,
Mark Leeson,
Tiegen Liu

Affiliations

Tianhua Xu: Key Laboratory of Opto-Electronic Information Technology (MoE), School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China
Cenqin Jin: School of Engineering, University of Warwick, Coventry CV4 7AL, UK
Shuqing Zhang: Department of Optical Engineering, Harbin Institute of Technology, Harbin 150001, China
Gunnar Jacobsen: NETLAB, RISE Research Institutes of Sweden, SE-16440 Stockholm, Sweden
Sergei Popov: Optics and Photonics Group, KTH Royal Institute of Technology, SE-16440 Stockholm, Sweden
Mark Leeson: School of Engineering, University of Warwick, Coventry CV4 7AL, UK
Tiegen Liu: Key Laboratory of Opto-Electronic Information Technology (MoE), School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China

DOI: https://doi.org/10.3390/app9214717
Journal volume & issue: Vol. 9, no. 21
p. 4717

Abstract

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Long-haul optical fiber communication employing digital signal processing (DSP)-based dispersion compensation can be distorted by the phenomenon of equalization-enhanced phase noise (EEPN), due to the reciprocities between the dispersion compensation unit and the local oscillator (LO) laser phase noise (LPN). The impact of EEPN scales increases with the increase of the fiber dispersion, laser linewidths, symbol rates, signal bandwidths, and the order of modulation formats. In this work, the phase noise cancellation (PNC) employing a radio frequency (RF) pilot tone in coherent optical transmission systems has been investigated. A 28-Gsym/s QPSK optical transmission system with a significant EEPN has been implemented, where the carrier phase recovery (CPR) was realized using the one-tap normalized least-mean-square (NLMS) estimation and the differential phase detection (DPD), respectively. It is shown that the RF pilot tone can entirely eliminate the LPN and efficiently suppress the EEPN when it is applied prior to the CPR.

Published in Applied Sciences

ISSN: 2076-3417 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Engineering (General). Civil engineering (General); Science: Biology (General); Science: Physics; Science: Chemistry
Website: http://www.mdpi.com/journal/applsci

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