An optical switch having a light input side and a light output side where there are a plurality of optical waveguides with light collimating lenses on one of the sides with the lenses in spaced positions and, on the other side there is an optical waveguide with a light collimating lens. To enable light...http://www.google.se/patents/US4378144?utm_source=gb-gplus-sharePatent US4378144 - Optical switch
