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Frontiers of Optoelectronics

Front. Optoelectron.    2019, Vol. 12 Issue (1) : 24-30     https://doi.org/10.1007/s12200-018-0754-8
REVIEW ARTICLE
Multi-channel phase regeneration of QPSK signals based on phase sensitive amplification
Hongxiang WANG, Tiantian LUO, Yuefeng JI()
State Key Lab of Information Photonics and Optical Communications, School of Information and Communication Engineering, Beijing University of Post and Telecommunications, Beijing 100876, China
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Abstract

In this paper, we propose and demonstrate simultaneous phase regeneration of four different channels of QPSK signal based on phase sensitive amplification. The configuration can be divided into two parts. The first one uses four wave mixing in high nonlinear fiber (HNLF) to generate the corresponding three harmonic conjugates precisely at the frequency of the original signals. The other one uses optical combiner to realize coherent addition which is aimed at completely removing the interaction in phase regeneration stage. The simulation results suggest that this scheme can optimize signal constellation to a large extend especially in high noise environment. Besides, optical signal to noise ratio (OSNR) can improve more than 3 dB while the bit-error-rate (BER) reaches 103 with a constant white noise and 15° phase noise.

Keywords four wave mixing      multi-channel      coherent addition      phase sensitive regeneration      optical combiner     
Corresponding Authors: Yuefeng JI   
Just Accepted Date: 19 March 2018   Online First Date: 09 April 2018    Issue Date: 29 April 2019
 Cite this article:   
Hongxiang WANG,Tiantian LUO,Yuefeng JI. Multi-channel phase regeneration of QPSK signals based on phase sensitive amplification[J]. Front. Optoelectron., 2019, 12(1): 24-30.
 URL:  
http://journal.hep.com.cn/foe/EN/10.1007/s12200-018-0754-8
http://journal.hep.com.cn/foe/EN/Y2019/V12/I1/24
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Hongxiang WANG
Tiantian LUO
Yuefeng JI
Fig.1  Frequency and phase relationship
Fig.2  Simulated setup for four different channels of QPSK signals
Fig.3  Frequency spectra at the points of (a) A and (b) B
Fig.4  Constellations of input and output signals (from left to right: input, output of S1, S2, S3, S4). (a) Only add white noise; (b) add white noise and 15 phase noise; (c) add white noise and 25 phase noise
Fig.5  BER of input and output signals with (a) only white noise; (b) white noise and 15 phase noise; (c) white noise and 25 phase noise
Fig.6  BER comparison among multi-channel, single channel and back-to-back with (a) only white noise; (b) white noise and 25 phase noise
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