一种偏振不敏感的薄膜铌酸锂变迹光栅耦合器设计方法
By optimizing grating parameters to design a polarization-insensitive apodization grating coupler, the polarization coupling problem between optical fiber and thin-film lithium niobate waveguide was solved, achieving efficient and broadband grating coupling and simplifying the process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ZHEJIANG UNIV
- Filing Date
- 2023-09-28
- Publication Date
- 2026-07-17
AI Technical Summary
Existing technologies struggle to achieve polarization-insensitive grating coupling between optical fibers and thin-film lithium niobate waveguides. Traditional methods are complex, have low coupling efficiency, and are not suitable for high-efficiency coupling in TE and TM modes.
By optimizing grating parameters, especially the combination of grating duty cycle, etching depth and grating period, a polarization-insensitive apodization grating coupler is designed. The particle swarm optimization algorithm is used for inverse optimization to achieve equivalent refractive index matching of TE and TM polarization modes, satisfy the Bragg condition and achieve efficient coupling.
This method achieves efficient coupling between optical fiber and thin-film lithium niobate waveguide, reduces mode field mismatch and loss, increases coupling bandwidth, has a simple process, is applicable to a variety of materials, and facilitates device packaging.
Smart Images
Figure CN117310874B_ABST