Study of frequency-guided-assisted residual optical carrier algorithms in low-cost coherent optical communication

IF 2.5 3区物理与天体物理 Q2 OPTICS

Optics Communications Pub Date : 2025-09-05 DOI:10.1016/j.optcom.2025.132423

Yichen Li, Yifan Chen, Jianyu Long, Chen Wang, Jianjun Yu

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Abstract

This paper investigates a phase noise suppression scheme based on residual optical carrier (ROC) for low-cost distributed feedback (DFB) lasers exhibiting MHz-level phase noise. The core of the ROC scheme is generating an auxiliary residual optical carrier with a frequency pilot tone (FPT). This is done by slightly offsetting the bias of the IQ modulator at the transmitter. This setup lets the receiver perform frequency offset estimation (FOE) and carrier phase recovery (CPR) at the same time. Through systematic numerical simulations and experimental validation, we analyze the impact of critical parameters—including carrier-to-signal power ratio (CSPR), low-pass filter (LPF) characteristics (type, bandwidth), guard interval, and laser linewidth tolerance—on the system performance. The results demonstrate that a third-order Gaussian LPF with 360 MHz bandwidth achieves optimal phase noise suppression with a 1 GHz guard interval. The proposed scheme offers a low-complexity solution for short-range coherent optical communication systems.

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低成本相干光通信中频导辅助残馀光载波算法研究

针对具有mhz级相位噪声的低成本分布式反馈（DFB）激光器，研究了一种基于剩余光载波（ROC）的相位噪声抑制方案。ROC方案的核心是产生一个带有频导音（FPT）的辅助残馀光载波。这是通过稍微抵消在发射机的IQ调制器的偏置来完成的。这种设置允许接收器同时执行频率偏移估计（FOE）和载波相位恢复（CPR）。通过系统的数值模拟和实验验证，我们分析了关键参数——包括载波与信号功率比（CSPR）、低通滤波器（LPF）特性（类型、带宽）、保护间隔和激光线宽公差——对系统性能的影响。结果表明，360 MHz带宽的三阶高斯LPF以1 GHz的保护间隔实现了最佳的相位噪声抑制。该方案为近距离相干光通信系统提供了一种低复杂度的解决方案。

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

Optics Communications 物理-光学

CiteScore

5.10

自引率

8.30%

发文量

681

审稿时长

38 days

期刊介绍： Optics Communications invites original and timely contributions containing new results in various fields of optics and photonics. The journal considers theoretical and experimental research in areas ranging from the fundamental properties of light to technological applications. Topics covered include classical and quantum optics, optical physics and light-matter interactions, lasers, imaging, guided-wave optics and optical information processing. Manuscripts should offer clear evidence of novelty and significance. Papers concentrating on mathematical and computational issues, with limited connection to optics, are not suitable for publication in the Journal. Similarly, small technical advances, or papers concerned only with engineering applications or issues of materials science fall outside the journal scope.