1. Grating Coupler FDTD Simulation

2. Grating Coupler
- Used for coupling light into waveguide or reverse
- Grating coupler design: period, etch depth, taper shape - Output angle is decided by effective index, period, input wavelength  Can be confirmed by FDTD Solver

3. Grating Coupler for 2-D,3-D FDTD
2D-Grating coupler
3D-Grating coupler

4. Exercise
Find the Output angle that maximize optical power for given grating coupler structure and compare with the given equation
Input wavelength: 1550nm
Pitch(period): 0.68μm, duty cycle: 0.54
Ncladding: 1.45, Neff ~ ( )/2 =2.6
Etch depth: 100nm