Frequency-Offset-Insensitive Equalizer for Coherent Transceivers Linear Impairment Compensation in Nyquist WDM System

IF 2.6 4区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Photonics Journal Pub Date : 2026-02-25 DOI:10.1109/JPHOT.2026.3667908

Ziheng Zhang;Zicai Cao;Mengfan Cheng;Zhijun Yan;Qi Yang;Ming Tang;Deming Liu;Lei Deng

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Abstract

As the per-channel data rate in Nyquist WDM systems increases, widely linear (WL) MIMO equalizers are required to compensate transceiver linear impairments. However, the crosstalk, filtering, and mixing effects arising from the interaction between frequency offset (FO) and transceiver impairments significantly degrade the FO tolerance of the WL-MIMO equalizer, limiting its applicability in Nyquist WDM systems. In this paper, we introduce an FO pre-compensation 8 × 2 WL-MIMO equalizer. By integrating a specially designed single-branch FO compensation structure with an 8 × 2 WL-MIMO equalizer based on the digital phase-locked loop least mean square algorithm, the proposed method achieves FO-insensitive transceiver impairment compensation with nearly unchanged computational complexity. Simulations of a Nyquist WDM system show that the proposed scheme achieves an FO tolerance exceeding 5 GHz. Moreover, a 32 GBaud dual-polarization 64 quadrature amplitude modulation signals transmission experiment over 75 km standard single-mode fiber further confirms that, while maintaining stable transceiver impairment compensation, the proposed scheme significantly extends the FO tolerance from 200 MHz to beyond 2 GHz compared with the conventional 8 × 2 WL-MIMO equalizer.

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奈奎斯特WDM系统相干收发器线性损伤补偿的频偏不敏感均衡器

随着奈奎斯特波分复用系统中每通道数据速率的提高，需要宽线性（WL） MIMO均衡器来补偿收发器的线性损伤。然而，由频偏（FO）和收发器损伤之间的相互作用引起的串扰、滤波和混合效应显著降低了WL-MIMO均衡器的FO容限，限制了其在Nyquist WDM系统中的适用性。本文介绍了一种FO预补偿8 × 2 WL-MIMO均衡器。该方法将专门设计的单支路FO补偿结构与基于数字锁相环最小均方算法的8 × 2 WL-MIMO均衡器相结合，在计算复杂度几乎不变的情况下实现了FO不敏感的收发器损伤补偿。对奈奎斯特波分复用系统的仿真结果表明，该方案可实现超过5 GHz的信号输出容忍。此外，在75 km标准单模光纤上进行的32 GBaud双偏振64正交调幅信号传输实验进一步证实，与传统的8 × 2 WL-MIMO均衡器相比，该方案在保持稳定的收发器损伤补偿的同时，显著地将FO容差从200 MHz扩展到2 GHz以上。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Photonics Journal ENGINEERING, ELECTRICAL & ELECTRONIC-OPTICS

CiteScore

4.50

自引率

8.30%

发文量

489

审稿时长

1.4 months

期刊介绍： Breakthroughs in the generation of light and in its control and utilization have given rise to the field of Photonics, a rapidly expanding area of science and technology with major technological and economic impact. Photonics integrates quantum electronics and optics to accelerate progress in the generation of novel photon sources and in their utilization in emerging applications at the micro and nano scales spanning from the far-infrared/THz to the x-ray region of the electromagnetic spectrum. IEEE Photonics Journal is an online-only journal dedicated to the rapid disclosure of top-quality peer-reviewed research at the forefront of all areas of photonics. Contributions addressing issues ranging from fundamental understanding to emerging technologies and applications are within the scope of the Journal. The Journal includes topics in: Photon sources from far infrared to X-rays, Photonics materials and engineered photonic structures, Integrated optics and optoelectronic, Ultrafast, attosecond, high field and short wavelength photonics, Biophotonics, including DNA photonics, Nanophotonics, Magnetophotonics, Fundamentals of light propagation and interaction; nonlinear effects, Optical data storage, Fiber optics and optical communications devices, systems, and technologies, Micro Opto Electro Mechanical Systems (MOEMS), Microwave photonics, Optical Sensors.