Brillouin Dual-wavelength Narrow-linewidth Fiber Laser and Its Application in Frequency-swept Microwave-signal Generation

被引：0
|
作者：
Bi W.-W. [1 ,2 ]
Feng T. [1 ,2 ]
Su J. [1 ,2 ]
Yan F.-P. [3 ]
Yao X.S. [1 ,2 ]
机构：
[1] Photonics Information Innovation Center, College of Physics Science & Technology, Hebei University, Baoding
[2] Hebei Provincial Center for Optical Sensing Innovations, Baoding
[3] School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing
来源：
Faguang Xuebao/Chinese Journal of Luminescence | 2022年 / 43卷 / 10期
基金：
中国国家自然科学基金;
关键词：
dual-wavelength fiber laser; frequency-swept microwave signal; stimulated Brillouin scattering;
D O I：
10.37188/CJL.20220176
中图分类号：
学科分类号：
摘要：
A Brillouin dual-wavelength narrow-linewidth fiber laser with a high-nonlinear-fiber（HNLF） is proposed and demonstrated， and the frequency-swept microwave-signal generation with the fiber laser is studied in detail. A narrow-linewidth fiber laser source as the seed laser is amplified by a high-power erbium-doped fiber amplifier. The amplified laser is then filtered to remove the strong amplified spontaneous emission noise by a high-reflection fiber Bragg grating（FBG） with the reflecting center wavelength close to the seed fiber laser’s output wavelength， and is subsequently used as the pump laser of stimulated Brillouin scattering（SBS） of the HNLF. The length of HNLF is 3.0 m long， which can provide a low SBS pump threshold. The cavity length of the Brillouin laser is 6.6 m， corresponding to a longitudinal-mode spacing of ~31 MHz， which can ensure the single-longitudinal-mode operation of the Brillouin laser. When the input power of HNLF is 1.8 W， the linewidth of the Brillouin laser measured is 622.50 Hz， and the dual-wavelength lasing output with a signal-to-noise ratio（OSNR） of >77 dB is obtained by combining the residual pump laser and the Brillouin laser. By beating the dual-wavelength laser output， a microwave signal with a frequency around 9.4 GHz is obtained. Using a step-motor based fiber stretcher to introduce strain modulation to the HNLF， the frequency-swept microwave signal with a sweep-range of 289.7 MHz and a sweep-rate of 10 Hz is realized. The proposed fiber laser has potential applications in optical/wireless communication， fiber sensing， and microwave photonics. © 2022 Chines Academy of Sciences. All rights reserved.
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页码：1601 / 1608
页数：7
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