Directional Coupler MODE Simulation HighSpeed Circuits Systems Lab

Directional Coupler MODE Simulation High-Speed Circuits & Systems Lab. Dept. of Electrical and Electronic Engineering Yonsei University Silicon Photonics (15/2) Yonsei University

Lumerical MODE Solution • FDE(Finite Difference Eigenmode) solver -Calculate physical properties of waveguide modes -Solve Maxwell’s equations for cross-sectional mesh • 2. 5 D var. FDTD(Finite Difference Time Domain) -Time domain simulation with approximation -2 D simulation speed with 3 D accuracy • EME(Eigenmode Expansion) solver -Frequency domain simulation Silicon Photonics (15/2) Yonsei University

Directional Coupler Coupling length Pcoupled Coupling gap Pin Silicon Photonics (15/2) Pthrough Yonsei University

Structure Upper Waveguide Lower Waveguide Coupling length 220 nm • Rib waveguide -Width : 500 nm -Thick : 220 nm -Slab : 130 nm Silicon Photonics (15/2) • 130 nm Coupling -gap : 100 nm -length : 1 um Yonsei University

Structure(Cladding) Silicon Photonics (15/2) Yonsei University

Structure Code(Slab) Silicon Photonics (15/2) Yonsei University

Structure Code(Waveguides) • Upper waveguide • Lower waveguide Silicon Photonics (15/2) Yonsei University

FDE Solver Silicon Photonics (15/2) Yonsei University

Simulation Result <Even mode> Silicon Photonics (15/2) <Odd mode> Yonsei University

2. 5 D var. FDTD -Time domain simulation with light propagation -Can monitor power at both through, coupled port Silicon Photonics (15/2) Yonsei University