一种正交偏振分束保偏输出分布反馈光纤激光器
By fabricating a π-phase-shifted fiber grating in a DFB fiber laser and utilizing polarization alignment technology, stable operation with dual linear polarization and orthogonal polarization beam splitting output were achieved. This solves the problems of poor stability and beam splitting effect of dual polarization modes in existing technologies and is suitable for fields such as high-speed coherent optical communication, precision optical measurement, and lidar.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- LASER RES INST OF SHANDONG ACAD OF SCI
- Filing Date
- 2026-04-28
- Publication Date
- 2026-07-17
AI Technical Summary
Existing DFB fiber lasers suffer from problems such as insufficient stability during dual polarization operation, lack of in-situ integration of polarization beam splitting with the laser body, low polarization axis accuracy, poor beam splitting effect, system redundancy, and complex fabrication, making it difficult to achieve orthogonal beam splitting output of narrow-linewidth laser dual polarization modes.
A π-phase-shifting fiber grating was fabricated by side-exposure of the fiber with ultraviolet laser to construct a stable dual-polarization DFB operation. The polarization pair axis was used to achieve precise matching between the laser's dual linear polarization modes and the fast and slow axes of the polarization-maintaining fiber. Then, the polarization-maintaining fiber PBS was used to achieve in-situ beam splitting of the orthogonal dual polarization modes, thus constructing a compact and stable distributed feedback fiber laser.
It achieves stable operation with dual linear polarization, suppresses polarization jumps and mode competition, maintains a high polarization extinction ratio and low polarization disturbance, has a compact structure and low insertion loss, and is suitable for engineering and miniaturization applications.
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Figure CN122118504B_ABST