A high OSNR, low threshold single-longitudinal-mode thulium-doped fiber laser based on a novel mode-selection filter

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

Optical Fiber Technology Pub Date : 2025-06-28 DOI:10.1016/j.yofte.2025.104325

Jiawen Liu , Fengping Yan , Ting Feng , Dandan Yang , Ting Li , Yuezhi Cai , Haoyu Tan , Xiangdong Wang , Qi Qin , Siyu Peng , Qiuyu Huang , Wenjie Ji , Ying Guo

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引用次数: 0

Abstract

A single-longitudinal-mode (SLM) thulium-doped fiber laser (TDFL) operating at 1941.82 nm with a high optical signal-to-noise ratio (OSNR), low threshold is proposed and investigated. A novel compound double-ring cavity (CDRC) filter, consisting of four optical couplers, selects a longitudinal mode by enlarging the free spectral range in the ring cavity. Moreover, a 0.30-m unpumped thulium-doped fiber is used as a saturable absorber to further achieve SLM excitation and the narrow linewidth output of the laser. The experimental results show that the proposed TDFL can generate a stable SLM laser at 1941.82 nm with a high OSNR of 87.22 dB and a low threshold of 1.90 W. The maximum wavelength drift and peak power fluctuation are 0.02 nm and 0.32 dB, respectively, for an observation time of 60 min. Furthermore, the linewidth of the laser is 8.06 kHz at an integration time of 0.001 s. When the frequency is greater than 1 MHz, the relative intensity noise is less than −124.15 dB/Hz.

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基于新型选模滤波器的高OSNR、低阈值单纵模掺铥光纤激光器

提出并研究了一种工作在1941.82 nm、高信噪比、低阈值的单纵模掺铥光纤激光器（TDFL）。一种新型复合双环腔（CDRC）滤波器，由四个光耦合器组成，通过扩大环形腔内的自由光谱范围来选择纵向模式。此外，采用0.30 m无泵浦掺铥光纤作为可饱和吸收体，进一步实现了SLM激发和窄线宽激光器输出。实验结果表明，所提出的TDFL可以产生稳定的1941.82 nm光阑，高OSNR为87.22 dB，低阈值为1.90 W。在60 min的观测时间内，激光器的最大波长漂移为0.02 nm，最大功率波动为0.32 dB。在0.001 s的积分时间内，激光器的线宽为8.06 kHz。当频率大于1mhz时，噪声相对强度小于−124.15 dB/Hz。

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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.