Compact tunable narrow-linewidth fiber laser light source

By employing a hybrid gain mechanism of erbium-doped fiber and random fiber grating in a fiber laser, combined with Brillouin scattering effect and distributed feedback, a compact, tunable, narrow-linewidth laser output is achieved, overcoming the shortcomings of traditional fiber lasers in terms of structural compactness and tunability. This technology is suitable for fiber optic sensing and optical communication.

CN120914595APending Publication Date: 2025-11-07SHANGHAI UNIV
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Patent Information

Application Number
CN202511038784.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-28
Publication Date
2025-11-07

AI Technical Summary

Technical Problem

Existing fiber lasers suffer from incompatibility between structural compactness and random distributed feedback in achieving ultra-narrow linewidth and tunability. Furthermore, traditional Brillouin erbium-doped fiber lasers require long single-mode fibers, resulting in non-uniform gain spectra and susceptibility to environmental disturbances.

Method used

By employing erbium-doped fiber as the nonlinear Brillouin gain and linear gain medium, and combining it with random fiber gratings to provide random distributed feedback, a compact erbium-doped Brillouin random fiber laser is constructed. The ultra-narrow linewidth, tunable laser output is achieved by utilizing the Brillouin scattering effect and the distributed feedback mechanism.

Benefits of technology

It achieves a compact, low-cost laser with resistance to environmental interference, ultra-narrow gain bandwidth and tunability, and is suitable for fiber optic sensing and optical communication transmission.

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Abstract

The invention discloses a compact tunable narrow-linewidth fiber laser light source, and belongs to the field of fiber lasers. The structure comprises a Brillouin pump and a Brillouin semi-open annular random fiber cavity. The Brillouin pump adopts a tunable laser and provides pump light for the Brillouin semi-open annular random optical fiber cavity. The erbium-doped optical fiber in the cavity serves as a nonlinear Brillouin gain medium and a linear gain medium at the same time, the narrowband gain of Stokes light is achieved through the stimulated Brillouin scattering effect in the optical fiber, laser output of different wavelengths can be achieved by adjusting the wavelength of Brillouin pump light and matching the center wavelength of the tunable filter, and the laser output of different wavelengths can be achieved. Random distributed feedback is introduced through the random fiber bragg grating to form random laser oscillation, the cavity length is greatly shortened, the line width is deeply compressed, and ultra-narrow line width tunable laser output is achieved while it is guaranteed that the structure of the laser light source is compact. According to the invention, the application of the tunable narrow linewidth laser in the aspects of optical fiber communication, biomedical imaging and the like is expanded.
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