Simulation of random fiber Bragg grating array in polarization-maintaining fiber based on photonic localization effect
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Abstract:
Mid-infrared wavelength switchable and dual-wavelength random laser (RL) output has many potential applications. A polarization-maintaining random fiber Bragg grating (PMRFBG) array based on the photonic localization effect of longitudinal invariant transverse disorder in fiber structure is proposed, which can be used as random feedback of dual-wavelength and wavelength switchable output of random fiber laser. The random fiber Bragg grating (RFBG) array was de-signed on the Panda-type polarization-maintaining fiber (PMF), and the two center wavelengths were 2151.60 nm and 2152.22 nm, respectively; The RFBG array was designed on the bow tie-type PMF, and the two center wavelengths were obtained, which were 2153.08 nm and 2153.96 nm, respectively; The RFBG array with a center wavelength of 2139.27nm was designed on single-mode fiber (SMF). The length of individual fiber Bragging grating (FBG) and PMFBG, the refractive index modulation depth, the number of cascaded gratings, and the distance between gratings have different effects on the FWHM and reflectance of the RFBG and PMRFBG array, but not on the central wavelength, as obtained by simulation using the transmission matrix method. The designed PMRFBG array provides theoretical support for the design of the feedback mechanism of random fiber laser (RFL).
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Project Supported:
National Natural Science Foundation of China [grant number: 52105540]; 111 Project [grant number: D17021]; Research Project of Beijing Municipal Natural Science Foundation & Beijing Education Committee [grant number: KZ201911232044].
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