| http://www.w3.org/ns/prov#value | - Also an optical space switch has been proposed and is disclosed in Photonic Switching, Vol. 8, Proceedings of the International Topical Meeting, Salt Lake City, Utah, Mar. 6-8, 1991, which includes a First reflecting block including a combination of a polarized light separator, a polarization controller, a quarter-wave (??/4) plate and an optical path modifying element, and a second reflecting blo
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