Laser linewidth and fiber nonlinearity tolerance study of C-16QAM compared to square 16QAM in coherent OFDM system

Xu, Fei; Qiao, Yaojun; Zhou, Ji; Guo, Mengqi; Tian, Huiping

doi:10.1016/j.yofte.2016.12.006

Cited by 4 publications

(3 citation statements)

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“…HS-12QAM is obtained by combining GS-12QAM with PS and the Euclidean distance between HS-12QAM constellation points is n times GS, where n is the scaling factor under the power normalization constraint. Studies prove that a circle constellation significantly improves the phase noise and fiber nonlinear effects tolerance compared with a square constellation 8 , 25 , 26 . Therefore, GS-8/12QAM and HS-8/12QAM are more advantageous than R-8/12QAM and PS-8/12QAM in optical fiber communication systems.…”

Section: Principles Of Hybrid Geometric-probabilistic Shapingmentioning

confidence: 98%

“…Studies prove that a circle constellation significantly improves the phase noise and fiber nonlinear effects tolerance compared with a square constellation. 8,25,26 Therefore, GS-8/ 12QAM and HS-8/12QAM are more advantageous than R-8/12QAM and PS-8/12QAM in optical fiber communication systems. The analysis of noise-resistance ability is presented in Sec.…”

Section: Minimum Euclidean Distance and Constellation Figure Of Merit...mentioning

confidence: 99%

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Performance analysis of hybrid geometric-probabilistic shaped 8/12 quadrature amplitude modulation for coherent optical communication system

Liu

et al. 2023

Opt. Eng.

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.A hybrid shaping (HS) scheme based on geometric shaping (GS) and probabilistic shaping (PS) in a coherent optical communication system is proposed. A particle swarm optimization algorithm and Maxwell-Boltzmann distribution are employed to sequentially implement GS and PS. The results demonstrate that hybrid shaped 8/12-ary quadrature amplitude modulation (HS-8/12QAM) is superior to regular-8/12QAM (R-8/12QAM) in terms of reducing the bit error rate (BER) and increasing the generalized mutual information (GMI). HS-8QAM achieves a 2 dB optical signal-to-noise ratio (OSNR) gain and 0.45 bits / symbol GMI gain compared with R-8QAM. Meanwhile, HS-12QAM achieves 1.9 dB OSNR gain and 0.68 bits/symbol GMI gain compared with R-12QAM. In addition, HS-8/12QAM is better than R-8/12QAM in terms of transmission distance and data rate.

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Section: Principles Of Hybrid Geometric-probabilistic Shapingmentioning

confidence: 98%

Section: Minimum Euclidean Distance and Constellation Figure Of Merit...mentioning

confidence: 99%

Performance analysis of hybrid geometric-probabilistic shaped 8/12 quadrature amplitude modulation for coherent optical communication system

Liu

et al. 2023

Opt. Eng.

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“…The CMA algorithm has robust convergence which can be used to make the eye open at the beginning of equalization. After opening the eye, the DD-LMS algorithm can be used to decrease the residual error [4] .…”

Section: Joint Equalization Algorithmmentioning

confidence: 99%

Blind Equalization Algorithm for 16-QAM Signals

Zhang¹,

Zeng²

2018

Proceedings of the 2018 8th International Conference on Manufacturing Science and Engineering (ICMSE 2018)

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This article propose and use the Modify Constant Modulus Algorithm (MCMA) and Decision-Directed Least Mean Square (DD-LMS) joint equalization Algorithm to balance Inter-Symbol-Interference (ISI) at the receiving end of 16-QAM. We analyzed the joint equalization technology implementation and switching threshold. Also we had carried on simulation experiments of four different equalization algorithms. The simulation results show that MCMA and DD-LMS joint equalization algorithm can get smaller residual error iteration, also can effectively repair the transmission process of phase shift.

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