Design of Polarization-Independent Coarse Wavelength Splitters Based on Ridge-Waveguide Directional Couplers
Figure 4
InP-based directional couplers: (a) effective indices (for even and odd supermodes) and (b) coupling lengths, for both TE and TM as a function of gap size g (in μm), with w = 0.4 μm. Inset shows a schematic of the directional coupler.
