[20a-A37-1~6] CS.3 Code-sharing Session of 3.4 & 3.13

9:45 AM - 10:00 AM JST(12:45 AM - 1:00 AM UTC)

[20a-A37-4] Structural Optimization of Thin-Film LNOI Waveguide Grating Couplers (Ⅱ)

〇Ryosei Kitahara¹, Naoki Tahara¹, Toshihiko Baba¹ (1.Yokohama Nat'l Univ.)

Keywords:

Thin-Film LNOI Waveguide,Grating Couplers,Optimization

High-speed optical modulators and high-efficiency nonlinear devices based on TFLN waveguides have been developed, attracting attention to their potential as next-generation optical integration platforms. However, the grating coupler for coupling with single-mode optical fibers has been a challenge to achieve high efficiency due to vertically symmetric radiation and mode mismatch. In this study, we found a structure with an efficiency of 64% (less than 2 dB loss) using CMA-ES, assuming a SiO2 over-cladding.