Broadly Tunable InGaAs/InP Buried Rib Waveguide Vertical Coupler Filter

We report the first demonstration of broadly electrically tunable (215 angstroms), narrow-band (~20 angstroms full width at half maximum), wavelength selective, grating-assisted coupling between vertically stacked buried rib InGaAsP/InP channel waveguides. This current injection tuned device is suitable for integration in a variety of photonic integrated circuits including amplifier/filter and demultiplexer/detector circuits.