| http://www.w3.org/ns/prov#value | - The light guiding region 21 is formed by selectively diffusing a metal such as Ti or the like in only a part corresponding to the light guiding region portion in the substrate 1a in the titanium diffusing process when the waveguide is formed, thereby having a larger refractive index than another part (the substrate la), similarly to the optical waveguide 4 described before.
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