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Keywords = triple-coupler ring-based compound-cavity filter

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10 pages, 4229 KB  
Communication
Sub-kHz Narrow-Linewidth Single-Longitudinal-Mode Thulium-Doped Fiber Laser Utilizing Triple-Coupler Ring-Based Compound-Cavity Filter
by Biao Guan, Fengping Yan, Dandan Yang, Qi Qin, Ting Li, Chenhao Yu, Xiangdong Wang, Kazuo Kumamoto and Yuping Suo
Photonics 2023, 10(2), 209; https://doi.org/10.3390/photonics10020209 - 14 Feb 2023
Cited by 13 | Viewed by 2433
Abstract
This paper proposes and demonstrates a single-longitudinal-mode thulium-doped fiber laser using a passive triple-coupler ring-based compound-cavity filter (TCR-CC) and a uniform fiber Bragg grating. For the first time, the TCR-CC filter is used to select a single mode from dense longitudinal modes. Experimental [...] Read more.
This paper proposes and demonstrates a single-longitudinal-mode thulium-doped fiber laser using a passive triple-coupler ring-based compound-cavity filter (TCR-CC) and a uniform fiber Bragg grating. For the first time, the TCR-CC filter is used to select a single mode from dense longitudinal modes. Experimental results show that laser in the wavelength of 1941.28 nm can maintain exceptional stability with an optical signal-to-noise ratio of 74.1 dB. The measured maximum wavelength drift and power fluctuation are 0.01 nm and 0.45 dB, respectively. Meanwhile, the measured linewidth of the laser is 910 Hz, and the relative intensity noise is below −125.82 dB/Hz above 2 MHz frequencies. Full article
(This article belongs to the Special Issue Single Frequency Fiber Lasers and Their Applications)
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