Design of Polarization-Independent Coarse Wavelength Splitters Based on Ridge-Waveguide Directional Couplers
Figure 2
(a) Schematic and (b) SEM photo of the cross-section for a typical high-index-contrast ridge waveguide. High index contrast exists in the lateral direction at the core-air interfaces. The core could be InGaAsP or SiGe, and the claddings are InP or Si, respectively.
