ELECTRO-OPTIC AND ALL-OPTIC COLLINEAR ASYMMETRICAL DIRECTIONAL COUPLER

A NEW DEVICE STRUCTURE, A COLLINEAR ASYMMETRICAL DIRECTIONALCOUPLER USING IN2O3/INXSN1-XOY HETEROSTRUCTURE THIN FILM, ISINTRODUCED WHICH WILL DECREASE THE POWER CONSUMPTION NEEDED TO OBTAIN FULL INTENSITY MODULATION, IS ADAPTABLE TO ANY SUBSTRATE, HAS A HIGH MULTIPLEXING CAPABILITY, AND WILL POTENTIALLY GIVE YIELD TO A NEW LINE OF BOTH ELECTRO-OPTIC AND ALL-OPTIC DEVICES. CONVENTIONAL COPLANAR DIRECTIONAL COUPLERS MUST HAVE WAVEGUIDES OF EXACTLY EQUAL WIDTHS WHICH IS EXTREMELY DIFFICULT TO ACHIEVE. WE WILL ELIMINATE THE STRINGENT WAVEGUIDE CHANNEL TOLERANCE REQUIREMENTS THROUGH AVARIABLE GUIDED MODE EFFECTIVE INDEX TECHNIQUE. UNLIKE THE III-V AND II-VI COMPOUND SEMICONDUCTOR HETEROSTRUCTURE, THE IN2O3/INXSN1-XOY FILM CAN BE GROWN ON ANY SURFACE. THEREFORE, AN ACTIVE DEVICE CAN BE BUILT ON AN ARRAY OF SUBSTRATE MATERIALS. THE IN2O3/INXSN1-XOY HAS TRANSPARENT BANDWIDTH FROM 400 NM TO MID-INFRARED. A LARGE NUMBER OF OPTICAL WAVELENGTHS CAN ALSO BE MULTIPLEXED. FINALLY, THE INDEX MODULATION OF IN2O3/INXSN1-XSN1-XOY FILM IS BROUGHT ABOUT BY CARRIER INJECTION. CONSEQUENTLY, BOTH ELECTRO-OPTIC AND ALL OPTICAL DEVICES CAN BE REALIZED BASED ON THE NOVEL CONCEPT. THE INDEX MODULATION WITH CARRIER INJECTION IS TWO ORDERS OF MAGNITUDE HIGHER THAN WITH THE LINEAR ELECTRO-OPTIC EFFECT. THE INTERACTION LENGTH IS EXPECTED TO BE COMPATIBLE WITH MULTI-QUANTUM WELL DEVICES.