O-band wavelength (de-)multiplexers on SOI featuring quasi-athermal behavior and fabrication insensitiveness

We report about design, fabrication, and testing of wavelength (de-)multiplexers in the O-band. Echelle gratings (EGs) on SOI featuring high wafer- and lot-level uniformity are presented, while quasi-athermal Mach-Zehnder-based architectures are discussed as well.