| http://www.w3.org/ns/prov#value | - A multilayer optical wiring substrate comprising: a substrate; 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 being provided on said over cladding layer for connecting said pair of slits. 22.
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