High Speed Polarization-Division Multiplexing Transmissions Based on the Nonlinear Fourier Transform

doi:10.12142/ZTECOM.201903008

ZTE Communications ›› 2019, Vol. 17 ›› Issue (3): 50-55.DOI: 10.12142/ZTECOM.201903008

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High Speed Polarization-Division Multiplexing Transmissions Based on the Nonlinear Fourier Transform

WANG Jia, ZHAO Yilong, HUANG Xin, HE Guangqiang

State Key Laboratory of Advanced Optical Communication Systems and Networks, Electronic Engineering Department, Shanghai Jiao Tong University, Shanghai 200240, China

Received:2018-08-31 Online:2019-09-29 Published:2019-12-06
About author:WANG Jia (jwang_wj@sjtu.edu.cn) received her B.S. degree in communication engineering from Nanjing Tech University, China in 2017. She is currently a postgraduate in the School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, China. Her main research interest is nonlinear optics.|ZHAO Yilong is pursuing his bachelor degree in electronic science and technology at Shanghai Jiao Tong University, China. His research interests include fiber nonlinearity mitigation algorithm and artificial intelligence.|HUANG Xin is pursuing his bachelor degree in information engineering at Shanghai Jiao Tong University, China. His research interests include optical communication, nonlinear photonics, and embedded system.|HE Guangqiang received his Ph.D. degree in communication and information system from Shanghai Jiao Tong University, China in 2006. He joined the Department of Electronic Engineering, Shanghai Jiao Tong University as a lecturer in 2006. From 2009 to 2010, he was a visiting scientist in Department of Physics and Astronomy, University of Rochester, New York, USA. Since December 2011, he has been an associate professor in the Department of Electronic Engineering, Shanghai Jiao Tong University. He has published over 50 SCI papers and held 5 patents. His research interests include quantum information processing, quantum entanglement, quantum cryptography, and nonlinear optics.

Abstract

Abstract:

Polarization-division multiplexing (PDM) with modulation in the nonlinear frequency domain consisting of the discrete and/or continuous spectrum has been recently regarded as a useful method to be utilized in optical fiber communication system. It can compensate the optical fiber nonlinearity based on the nonlinear Fourier transform (NFT). In this paper, we combine PDM with the method of nonlinear frequency division multiplexing (NFDM) and demonstrate the achievable transmission rate by increasing the number of multiplexing nonlinear channels. For the selected subcarriers (i.e. 32, 64, and 128), the transmission rates are 64 Gbits/s, 76.8 Gbits/s, and 109.7 Gbits/s respectively by applying 64-quadrature amplitude modulation (64-QAM) on the nonlinear continuous spectrum. For the transmission distance shorter than 1 200 km, the transmission rate of 128-NFDM PDM system can even reach up to 153.6 Gbits/s.

Key words: fiber optics communications, multiplexing, nonlinear optical signal processing

WANG Jia, ZHAO Yilong, HUANG Xin, HE Guangqiang. High Speed Polarization-Division Multiplexing Transmissions Based on the Nonlinear Fourier Transform[J]. ZTE Communications, 2019, 17(3): 50-55.

Figures/Tables 5

Figure 1. PDM-NFDM transmission system with data processing process in the transmitter and receiver.

Table 1 The parameters used in different PDM-NFDM transmission systems

Channels	Baud rate /Gbaud	Guard interval /ns	Modulation format	Bandwidth /GHz	Transmission rate /(Gbits/s)	Spectral efficiency /(bits/s/Hz)	Distance /km	Q-factor
32	0.5	4	64-QAM	16	64	4	1 200	6.234
64	0.5	8	64-QAM	32	76.8	2.4	1 200	7.405
128	0.5	12	64-QAM	64	109.7	1.71	1 200	6.751
128	0.5	8	64-QAM	64	153.6	2.4	960	8.195

Figure 2. The constellation diagram at the distance of 960 km for the case of 32 subcarriers (left column) and 128 subcarriers (right column); a) linewidth=0, w/o carrier recovery; b) linewidth=1 kHz, w/o carrier recovery; c) linewidth=1 kHz, with carrier recovery.

Figure 3. Q-factor versus launched power with the case of 128 subcarriers.

Figure 4. Constellation diagram at the receiver a) with the launched power at -1.7563 dBm; b) with the launched power at 1.8092 dBm.

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High Speed Polarization-Division Multiplexing Transmissions Based on the Nonlinear Fourier Transform

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