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Clipping discrete multi-tone for peak-power-constraint IM/DD optical systems

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Abstract

High peak-to-average power ratio (PAPR) is a major drawback of discrete multi-tone (DMT) in peak-power-constraint (PPC) intensity-modulation/direct-detection (IM/DD) optical systems. Symmetric clipping operation is a frequently-used and practical method for mitigating the PAPR of the DMT signal. However’ clipping noise is inevitably induced by the symmetric clipping operation’ thereby deteriorating the system’s performance. In this paper, we study the statistical characteristics of the clipping noise in detail. Depending on the statistical characteristics, clipping-noise-cancellation (CNC) algorithms are proposed to mitigate the clipping noise in the clipping DMT systems. Theoretically, the clipping noise can be completely removed using the low-density-parity-check-assisted CNC algorithm (LDPC-assisted CNC algorithm). To verify the superiority of the clipping DMT with the CNC algorithm, we conduct an experiment with a 50 Gb/s DMT system using 10G-class commercial devices for the scenario of PPC passive optical networks. The receiver sensitivity of the clipping DMT system with the CNC algorithm can reach −24 dBm at a 20% soft-decision forward-error-correction limit, which is 2.5 dB higher than that of the DMT system without clipping operation. The clipping operation and the CNC algorithm are added after the original digital signal processing, thereby demonstrating the potential to effectively overcome the drawback in DMT signals and other high-PAPR signals.

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Acknowledgements

This work was supported in part by National Key R&D Program of China (Grant No. 2018YFB1802300), National Natural Science Foundation of China (Grant Nos. 62005102, U2001601, 61971372), Natural Science Foundation of Guangdong Province (Grant No. 2019A1515011059), Guangzhou Basic and Applied Basic Research Foundation (Grant No. 202102020996), Fundamental Research Funds for the Central Universities (Grant No. 21619309), Open Fund of IPOC (BUPT) (Grant No. IPOC2019A001), and Hong Kong Scholars Program (Grant No. XJ2021018).

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Authors and Affiliations

  1. Department of Electronic Engineering, College of Information Science and Technology, Jinan University, Guangzhou, 510632, China

    Ji Zhou, Shecheng Gao, Yuanhua Feng, Shancheng Zhao & Weiping Liu

  2. Optical Research Department, Huawei Technologies Co., Ltd., Dongguan, 523808, China

    Liangchuan Li, Jiale He, Xiaofeng Lu, Yu Bo, Guanyu Wang, Yuanda Huang, Gengchen Liu & Yanzhao Lu

  3. Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Hong Kong, 999077, China

    Changyuan Yu

  4. Guangdong Provincial Key Laboratory of Optoelectronic Information Processing Chips and Systems, Sun Yat-sen University, Guangzhou, 510275, China

    Zhaohui Li

  5. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 511458, China

    Zhaohui Li

Authors
  1. Ji Zhou
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  2. Liangchuan Li
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  3. Jiale He
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  13. Weiping Liu
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  14. Changyuan Yu
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  15. Zhaohui Li
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Corresponding authors

Correspondence to Ji Zhou, Liangchuan Li or Shecheng Gao.

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Zhou, J., Li, L., He, J. et al. Clipping discrete multi-tone for peak-power-constraint IM/DD optical systems. Sci. China Inf. Sci. 66, 152302 (2023). https://doi.org/10.1007/s11432-022-3555-y

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  • DOI: https://doi.org/10.1007/s11432-022-3555-y

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