(under subclass 27) Subject matter wherein the desired coupling function is achieved by matching the propagation constants of light travelling in coupled waveguides (also resulting in overlapping evanescent fields).
(1) Note. The structure of evanescent wave couplers often includes the removal of most of the waveguide cladding material in the actual coupling region.
SEE OR SEARCH CLASS
451, Abrading,
41+, for a process of abrading a glass substrate (a typical technique for forming evanescent wave couplers).
