A low-noise linearly polarized fiber laser based on polarization-controlled PT symmetry
By leveraging the synergistic effect of a linear reflection structure and a polarization controller, single longitudinal mode selection under PT symmetry breaking conditions is achieved. This solves the problems of structural complexity and performance deficiencies in existing PT-symmetric fiber lasers, enabling high optical signal-to-noise ratio, low noise, and high polarization purity single longitudinal mode output. It is suitable for fields such as coherent optical communication, lidar, high-precision fiber optic sensing, microwave photonics, and spectral analysis.
CN122092033APending Publication Date: 2026-05-26ANHUI UNIV
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Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ANHUI UNIV
- Filing Date
- 2026-03-05
- Publication Date
- 2026-05-26
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Figure CN122092033A_ABST
Abstract
A low-noise linearly polarized fiber laser based on polarization-controlled PT symmetry belongs to the field of fiber laser technology. The pump source emits laser light, which is coupled into the main loop cavity through a polarization-maintaining wavelength division multiplexer. This excites stimulated emission of laser light from a polarization-maintaining erbium-doped fiber, which then enters the polarization-maintaining circulator, polarization controller, and fiber reflector. The reflected light passes again through the polarization controller, polarization-maintaining circulator, and polarization-maintaining optical coupler. 20% of the polarization-maintaining optical coupler's port is used for laser output, and 80% of its port is used for intracavity circulation. By adjusting the polarization controller, the loop gain and loss formed by the two orthogonal polarization modes are balanced and exceed the coupling coefficient between the two modes, achieving PT symmetry breaking and obtaining single-longitudinal-mode output. This invention has advantages such as convenient adjustment, high stability, high side-mode suppression ratio, high optical signal-to-noise ratio, narrow linewidth, high polarization degree, and low noise, and can be widely used in coherent optical communication, lidar, microwave photonics, precision measurement, and other fields.
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