ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Broadband bidirectional Brillouin-Raman random fiber laser with ultra-narrow linewidth |
Qian Yang(杨茜), Yang Li(李阳), Hui Zou(邹辉), Jie Mei(梅杰), En-Ming Xu(徐恩明), and Zu-Xing Zhang(张祖兴)† |
Advanced Photonic Technology Laboratory, College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China |
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Abstract We present a Brillouin-Raman random fiber laser (BRRFL) with full-open linear cavity structure to generate broadband Brillouin frequency comb (BFC) with double Brillouin-frequency-shift spacing. The incorporation of a regeneration portion consisting of an erbium-doped fiber and a single-mode fiber enables the generation of broadband BFC. The dynamics of broadband BFC generation changing with the pump power (EDF and Raman) and Brillouin pump (BP) wavelength are investigated in detail, respectively. Under suitable conditions, the bidirectional BRRFL proposed can produce a flat-amplitude BFC with 40.7-nm bandwidth ranging from 1531 nm to 1571.7 nm, and built-in 242-order Brillouin Stokes lines (BSLs) with double Brillouin-frequency-shift spacing. Moreover, the linewidth of single BSL is experimentally measured to be about 2.5 kHz. The broadband bidirectional narrow-linewidth BRRFL has great potential applications in optical communication, optical sensing, spectral measurement, and so on.
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Received: 20 July 2023
Revised: 26 October 2023
Accepted manuscript online: 06 November 2023
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PACS:
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42.60.Da
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(Resonators, cavities, amplifiers, arrays, and rings)
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42.60.Fc
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(Modulation, tuning, and mode locking)
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42.60.Jf
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(Beam characteristics: profile, intensity, and power; spatial pattern formation)
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42.65.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 62175116 and 91950105), the 1311 Talent Plan of Nanjing University of Posts and Telecommunications, China, and the Postgraduate Research & Practice Innovation Program, Jiangsu Province, China (Grant No. SJCX21_0276). |
Corresponding Authors:
Zu-Xing Zhang
E-mail: zxzhang@njupt.edu.cn
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Cite this article:
Qian Yang(杨茜), Yang Li(李阳), Hui Zou(邹辉), Jie Mei(梅杰), En-Ming Xu(徐恩明), and Zu-Xing Zhang(张祖兴) Broadband bidirectional Brillouin-Raman random fiber laser with ultra-narrow linewidth 2024 Chin. Phys. B 33 024206
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