Two important considerations for designing coupling prisms for optical waveguides are (a) coupling the incident wave to the full range of effective indices for the modes in the waveguide and (b) the ability to observe the optically contacted area, the wet spot, between the prism and waveguide. The latter becomes a problem with high-index prisms owing to total internal reflections. Design parameters for prisms satisfying both of these requirements are derived, and numerical examples are presented for both symmetrical and right-angle rutile prisms.
© 1987 Optical Society of America
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