PT symmetry breaking enabled single-longitudinal-mode brillouin erbium-doped fiber laser with ultra narrow linewidth

IF 2.7 3区计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Optical Fiber Technology Pub Date : 2025-10-02 DOI:10.1016/j.yofte.2025.104434

Yajun You , Sha Liu , Xulei Yang , Huijie Wang , Qiwei Chang , Wenjun He , Jian He , Yi Liu , Xiujian Chou

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Abstract

This study presents an innovative design and validates through experimental implementation a Brillouin Erbium-doped hybrid fiber laser architecture employing parity-time (PT) symmetry principles. The configuration synergistically combines a kilometer-long single-mode fiber for Brillouin amplification with a polarization-engineered Sagnac loop to achieve exceptional spectral purity. Through dynamic polarization state manipulation within dual feedback paths, gain-loss equilibrium is disrupted when the stimulated Brillouin gain surpasses the loop coupling coefficient, effectively suppressing inter-mode rivalry and achieving single-longitudinal-mode output. Through the Brillouin erbium gain synergy mechanism, significantly augment Stokes optical power leveraging erbium gain amplification. Experimental characterization under 14.5 dBm pump power and 400 mW 980 nm excitation demonstrates remarkable performance metrics: 3.75 Hz 3-dB linewidth, 60 dB optical SNR, and 70 dB sideband suppression ratio. The integration of erbium amplification enables power scaling while maintaining spectral integrity through PT symmetry mediated mode selection. This work establishes a compact, high-performance laser platform for applications requiring stable narrow linewidth sources, such as coherent communications and distributed fiber sensing.

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PT对称破缺实现了超窄线宽单纵模布里渊掺铒光纤激光器

本研究提出了一种创新的设计，并通过实验实现了一种利用宇称时间（PT）对称原理的布里渊掺铒混合光纤激光器结构。该配置协同结合了用于布里渊放大的一公里长的单模光纤和偏振工程Sagnac环路，以实现卓越的光谱纯度。通过双反馈路径内的动态极化状态操纵，当受激布里渊增益超过环耦合系数时，增益-损耗平衡被打破，有效抑制模间竞争，实现单纵模输出。通过布里渊铒增益协同机制，利用铒增益放大显著增强Stokes光功率。在14.5 dBm泵浦功率和400 mW 980 nm激励下的实验表征显示出卓越的性能指标：3.75 Hz 3 dB线宽，60 dB光信噪比和70 dB边带抑制比。铒放大的集成可以实现功率缩放，同时通过PT对称介导的模式选择保持频谱完整性。这项工作为需要稳定窄线宽源的应用（如相干通信和分布式光纤传感）建立了一个紧凑、高性能的激光平台。

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

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.