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
G02B6/10 of the optical waveguide type
G02B6/12 of the integrated circuit kind
G02B6/122 Basic optical elements, e.g. light-guiding paths