Topological photonics enables the systematic handling of internal degrees of freedom of light (optical spin and orbital angular momentum) in optical communications by introducing the concept of topology from mathematics into the field of photonics. This paper focuses on topological waveguides, which are the most important components in topological photonic systems, and explains the specific behavior caused by optical spins within waveguides.

In this study, we realized an optical device analysis program that achieves results equivalent to those of 3DFDTD with a small amount of computation time and computational resources using transfer learning, and actually applied it to a 1 × 2 MMI coupler to discuss its usefulness. The proposed model has an R2 score of 0.901 and an analysis time of about 47.4 μs per calculation, which is sufficiently fast compared to the 3D-FDTD. © 2025 IEEE.