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

Liang Shu; Zhenming Yu; Zhiquan Wan; Tian Zhang; Jianqiang Li; Xiang Li; Ming Luo; Songnian Fu; Kun Xu

doi:10.1117/12.2518329

14 February 2019 Sparse I/Q Volterra filter for optical 16-QAM signals in direct-detection Kramers-Kronig receiver

Liang Shu, Zhenming Yu, Zhiquan Wan, Tian Zhang, Jianqiang Li, Xiang Li, Ming Luo, Songnian Fu, Kun Xu

Proceedings Volume 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018); 110480G (2019) https://doi.org/10.1117/12.2518329
Event: 17th International Conference on Optical Communications and Networks (ICOCN2018), 2018, Zhuhai, China

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.

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Liang Shu, Zhenming Yu, Zhiquan Wan, Tian Zhang, Jianqiang Li, Xiang Li, Ming Luo, Songnian Fu, and Kun Xu "Sparse I/Q Volterra filter for optical 16-QAM signals in direct-detection Kramers-Kronig receiver", Proc. SPIE 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018), 110480G (14 February 2019); https://doi.org/10.1117/12.2518329

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KEYWORDS

Receivers

Distortion

Signal detection

Optical filters

Digital signal processing

Electronic filtering

Modulators

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