A raised-rib waveguide provides a low-loss coupling to a conventional single-mode optical fiber propagating light of a wavelength (.lambda.). An exemplary embodiment of the waveguide is disclosed for a wavelength of 0.85 .mu.m. In order to identify the values of the structural and compositional parameters...http://www.google.de/patents/US5109464?utm_source=gb-gplus-sharePatent US5109464 - Rib waveguide optimized for low loss coupling to optical fibers and method of determining same
