G PHYSICS
G02 OPTICS
G02B OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
6/00 Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
G02B6/24 Coupling light guides
G02B6/26 Optical coupling means
G02B6/28 having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
G02B6/293 with wavelength selective means
G02B6/29331 operating by evanescent wave coupling
G02B6/29335 Evanescent coupling to a resonator cavity, i.e. between a waveguide mode and a resonant mode of the cavity
G02B6/29338 Loop resonators