Single longitudinal mode continuous tuning optical fiber ring cavity laser based on dispersion compensation

By introducing tunable dispersion compensation devices and adaptive narrowband feedback mechanisms into fiber ring cavity lasers, the mode-hopping problem in the tuning process of single-frequency lasers is solved, achieving stable continuous tuning of a single longitudinal mode, which is suitable for high-stability and high-resolution spectral scanning and sensing systems.

CN121216201APending Publication Date: 2025-12-26BEIJING UNIV OF TECH
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Patent Information

Application Number
CN202511284392.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-09-09
Publication Date
2025-12-26

AI Technical Summary

Technical Problem

Existing single-frequency lasers are prone to mode skipping during tuning, making it difficult to achieve stable continuous tuning of a single longitudinal mode. Furthermore, existing technical solutions suffer from complex structures, high costs, and poor reliability.

Method used

A single-longitudinal-mode continuously tuned fiber ring cavity laser structure based on dispersion compensation is adopted. By introducing tunable dispersion compensation devices, the propagation time of the laser signal is precisely controlled, the phase condition between the cavity mode position and the center wavelength of the filter is dynamically matched, the mode skipping phenomenon is suppressed, and an adaptive narrowband feedback mechanism is formed through a saturable absorber and a total reflection mirror to ensure single-frequency output.

Benefits of technology

It achieves stable, continuous, and non-mode-hopping single longitudinal mode output over a wide tuning range. It features a compact structure, flexible control, and is suitable for high-stability and high-resolution spectral scanning and sensing systems, reducing system complexity and cost.

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Abstract

The invention discloses a single longitudinal mode continuous tuning optical fiber ring cavity laser based on dispersion compensation. The single longitudinal mode continuous tuning optical fiber ring cavity laser comprises a pumping source, a beam combiner, a gain optical fiber, an isolator, a saturable absorber, a wavelength adjustable filtering device, a dispersion compensation device, a circulator, a total reflective mirror and a beam splitter. The pumping source is coupled into the gain optical fiber through the beam combiner to provide gain for a laser signal; the isolator is arranged behind the gain optical fiber and used for guaranteeing one-way transmission of laser in the ring cavity and restraining return interference. The gain light passing through the isolator realizes continuous tuning control of the central wavelength through the wavelength adjustable filter device, then sequentially passes through the beam splitter, the circulator and the dispersion compensation device, and finally returns to the beam combiner to form a closed loop, so that a stable optical fiber ring cavity is constructed. The beam splitter outputs part of the light as a laser signal, while the main optical path continues to maintain intracavity oscillation. The mode hopping phenomenon in the frequency sweeping process can be effectively restrained, and it is guaranteed that the laser keeps single-longitudinal-mode continuous output within the whole tuning range.
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