Multi-channel phase regeneration of QPSK signals based on phase sensitive amplification

doi:10.1007/s12200-018-0754-8

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 $10 − 3$ with a constant white noise and $15 °$ phase noise.

Keywords four wave mixing multi-channel coherent addition phase sensitive regeneration optical combiner

Corresponding Author(s): 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:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-018-0754-8
https://academic.hep.com.cn/foe/EN/Y2019/V12/I1/24

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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