Low-overhead joint pre-distortion and QDA equalization scheme in 100-Gb/s PAM4 signals IM/DD-based system

IF 2.7 3区计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Optical Fiber Technology Pub Date : 2025-07-01 Epub Date: 2025-03-05 DOI:10.1016/j.yofte.2025.104182

Yingxue Zhang , Xiangmin Fang , Meihua Bi , Yongqiang Zhang , Huiyan Wu , Miao Hu

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Abstract

In this paper, a low overhead joint look-up table (LUT) and quadratic discriminant analysis (QDA) scheme is firstly presented to realize the compensation of inter-symbol interference (ISI) in the high-speed short-range intensity modulation and direct detection (IM/DD) system. Here, the LUT is employed to mitigate the signal distortion by generating pre-distorted signals, and the QDA is utilized to equalize the received signals that without requiring the extra complex optimization algorithm. A 100-Gb/s 4-level pulse amplitude modulation (PAM-4) IM/DD simulation transmission system is established to verify the effectiveness of our proposed scheme. The results show that the proposed LUT-QDA reduces the training sequence length by 76% and the number of taps by 63% compared to Volterra, and outperforms the Volterra and QDA by almost 1.3 dBm and 1.5 dBm at 20 km standard single-mode fiber (SSMF) transmission, respectively.

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100gb /s PAM4信号IM/ dd系统的低开销联合预失真和QDA均衡方案

本文首次提出了一种低开销联合查找表（LUT）和二次判别分析（QDA）方案，以实现高速短距离强调制直接检测（IM/DD）系统中码间干扰（ISI）的补偿。在这里，LUT被用来通过产生预失真信号来减轻信号失真，QDA被用来平衡接收到的信号，而不需要额外复杂的优化算法。建立了100 gb /s 4级脉冲调幅（PAM-4） IM/DD仿真传输系统，验证了所提方案的有效性。结果表明，与Volterra相比，所提出的LUT-QDA减少了76%的训练序列长度和63%的抽头数量，在20公里标准单模光纤（SSMF）传输时，分别比Volterra和QDA高出近1.3 dBm和1.5 dBm。

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来源期刊

Optical Fiber Technology 工程技术-电信学

CiteScore

4.80

自引率

11.10%

发文量

327

审稿时长

63 days

期刊介绍： Innovations in optical fiber technology are revolutionizing world communications. Newly developed fiber amplifiers allow for direct transmission of high-speed signals over transcontinental distances without the need for electronic regeneration. Optical fibers find new applications in data processing. The impact of fiber materials, devices, and systems on communications in the coming decades will create an abundance of primary literature and the need for up-to-date reviews. Optical Fiber Technology: Materials, Devices, and Systems is a new cutting-edge journal designed to fill a need in this rapidly evolving field for speedy publication of regular length papers. Both theoretical and experimental papers on fiber materials, devices, and system performance evaluation and measurements are eligible, with emphasis on practical applications.