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Sparse I/Q Volterra filter for optical 16-QAM signals in direct-detection Kramers-Kronig receiver
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Paper Abstract

We have experimentally demonstrated a direct-detection (DD) 112-Gbit/s 16 quadrature amplitude modulation (QAM) transmission over single-span 140-km standard single mode fiber (SSMF) with Kramers-Kronig receiver and a sparse I/Q Volterra filter (VF). The sparse I/Q VF was proposed in our previous work and it is based on dual-input real-valued Volterra series and ℓ1-regularization method. In this paper it is used for compensating the nonlinear distortion in a short-reach DD optical 16-QAM signal transmission system. In back to back case, sparse I/Q VF represents the great compensation ability to the saturation effect of the electrical amplifiers and the nonlinear sinusoidal transfer function of I/Q modulator. It provides around 1-order magnitude improvement of BER when reducing 84% complexity from full I/Q VF. For fiber transmission case, sparse I/Q VF can mitigate the fiber nonlinearity effectively and it achieves single-span 140-km transmission at hard-decision forward error correction (HD-FEC) threshold of 3.8 ×10-3 with less than half complexity of full I/Q VF. Besides, optical signal noise ratio (OSNR) performance at 120 km is measured and sparse I/Q VF reduces the required OSNR at HD-FEC threshold by 1.3 dB. In a word, we investigate the performance of sparse I/Q VF in short-reach optical 16-QAM transmission system and sparse I/Q VF reveals its potential in the growing short-reach applications, such as data center inter-connection and metropolitan area network.

Paper Details

Date Published: 14 February 2019
PDF: 6 pages
Proc. SPIE 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018), 110480G (14 February 2019); doi: 10.1117/12.2518329
Show Author Affiliations
Liang Shu, Beijing Univ. of Posts and Telecommunications (China)
Zhenming Yu, Beijing Univ. of Posts and Telecommunications (China)
Zhiquan Wan, Beijing Univ. of Posts and Telecommunications (China)
Tian Zhang, Beijing Univ. of Posts and Telecommunications (China)
Jianqiang Li, Beijing Univ. of Posts and Telecommunications (China)
Xiang Li, State Key Lab. of Optical Communication Technologies and Networks (China)
Ming Luo, State Key Lab. of Optical Communication Technologies and Networks (China)
Songnian Fu, Huazhong Univ. of Science and Technology (China)
Kun Xu, Beijing Univ. of Posts and Telecommunications (China)


Published in SPIE Proceedings Vol. 11048:
17th International Conference on Optical Communications and Networks (ICOCN2018)
Zhaohui Li, Editor(s)

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