Non-adiabatically-tapered connector

Abstract From the Canadian patent

Disclosed is a mode field modifier which can be used in a fiber-to-fiber connector or a source-to-fiber connector. In a downtaper-type mode field modifier embodiment, the modifier comprises a modifier core of refractive index n1 surrounded by first and second cladding layers having refractive indices n2 and n3 respectively. In an uptaper-type mode field modifier embodiment the, modifier comprises a modifier core of refractive index n1 surrounded by a cladding layer having a refractive index n2. The refractive indices are such that n1 > n2 > n3. In both embodiments, there is a nonadiabatic taper intermediate the ends of the mode field modifier whereby a, substantial amount of mode coupling …