| http://www.w3.org/ns/prov#value | - A multilayer optical wiring substrate comprising: a substrate; a first optical wiring layer including: optical waveguides being formed on said substrate and including an under cladding layer, a core layer and an over cladding layer; a pair of slits arranged substantially in parallel on both sides of said core layer; and at least one groove provided on said over cladding layer for connecting said p
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