Tunable and switchable multi-wavelength fiber laser based on polarization hole burning effect and Sagnac loop mirrors
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Tunable and switchable multi‑wavelength fiber laser based on polarization hole burning effect and Sagnac loop mirrors Xuefang Zhou1 · Zengyang Li1 · Yu Zhou1 Received: 24 April 2020 / Accepted: 24 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this paper, a stable highly tunable and switchable multi-wavelength fiber laser is presented. It is based on the filtering characteristics of the Sagnac loop mirror and the polarization-dependent devices, the polarization hole burning effect is induced to generate multi-wavelength output with high optical signal-to-noise ratio and narrow 3 dB linewidth, optical signal-to-noise ratio is about 50 dB and linewidth is less than 0.02 nm. The tunable bandwidth is about 30 nm, which covers almost the entire C-band. By the adjusting polarization controller, the number and wavelength spacing of laser emissions can be controlled and switched. The single-wavelength exhibits good power and wavelength stability, the peak power fluctuation is less than 0.04 dB and the wavelength drift is less than 0.04 nm, and the wavelength spacing of the dual-wavelength can be tuned from 0.67 to 27.4 nm. In the proposed structure, multi-wavelength up to 6 laser emissions can be obtained span from 1528 to 1562 nm. Keywords Erbium-doped fiber laser · Tunable and switchable laser · Polarization hole burning effect · Variable wavelength spacing
1 Introduction Tunable multi-wavelength fiber lasers have important applications in many fields, such as optical signal processing, fiber sensing (Gao et al. 2012; Ahmad et al. 2012; Xu and Zhang 2017), photonic microwave (Liu et al. 2013), and optical fiber communication. At present, there are many ways to implement multi-wavelength lasers, such as stimulated Brillouin effect (SBS) (Zhang et al. 2018; Im et al. 2011; Mamdoohi et al. 2013; Zhang et al. 2017; Zhou et al. 2016), fiber Bragg grating (FBG) (Aporta et al. 2016; Zhao et al. 2005; He et al. 2017), few-mode fibers (FMFS) (Sun et al. 2011; Moon et al. 2005), Sagnac loop mirror (Jia et al. 2015; Lee et al. 2004; Liu et al. 2008; Kim and Han 2011; Saleh et al. 2017) and other interferometers. Among them, as an important communication band, erbium-doped fibers (EDF) is often used as an active medium in the C-band, and EDF has the characteristic of uniform broadening at room temperature, thus causing mode competition to suppress * Zengyang Li [email protected] 1
School of Communication Engineering, Hangzhou Dianzi University, Zhejiang 310018, China
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stable multi-wavelength oscillation. Therefore, suppressing mode competition has become an important problem for generating stable multi-wavelength emissions. The mode competition can be effectively suppressed by four-wave mixing (FWM) (Liu et al. 2005; Wang et al. 2013; Liu and Lu 2005), introducing intensity-dependent losses (IDL) (Feng et al. 2006; Lian et al. 2017; Pan and Lou 2006), as well as polarization hole burning effects (PHB) (Zhang et al. 2
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