Guojian Ding, Xiaohui Wang, Qi Feng, Ping Yu, Haiqiang Jia, Hong Chen, Yang Wang. Design of high-efficiency lithium niobate thin film waveguide mode size converter[J]. Infrared and Laser Engineering, 2023, 52(9): 20220897
- Infrared and Laser Engineering
- Vol. 52, Issue 9, 20220897 (2023)
Fig. 1. Schematic diagram of lithium niobate film ridge waveguide structure
Fig. 2. Structural diagram of spot size converter
Fig. 3. Variation of waveguide mode with ridge waveguide width
Fig. 4. TE0 distribution of LN ridge waveguide
Fig. 5. Mode field distribution of single-mode fiber
Fig. 6. Waveguide parameters of SiO2 waveguide under single mode condition and x -y cross sectional TE0 mode field distribution of SiO2 waveguide with 6 µm×6 µm waveguide size
Fig. 7. Single mode condition and x -y cross sectional TE0 mode field distribution of SiON waveguide
Fig. 8. Relation curve between taper waveguide lengthL 1 and conversion efficiency under different SiON taper waveguide tip width W 1
Fig. 9. The influence of W 5 and L 2 on the conversion efficiency in Zone III
Fig. 10. Relation curve between taper length L 3 and conversion efficiency in Zone IV under different taper tip width W 6
Fig. 11. （a） Structure diagram, （b） optical field transmission diagram and （c） cross section optical field distribution diagrams of designed spot size converter
Fig. 12. Relationship between transverse dislocation and coupling loss
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