| http://www.w3.org/ns/prov#value | - The light guiding region 21 guides the radiation light radiated from the Y-shaped recombining portion R2 and the signal light leaking from the Y-shaped recombining portion R2 such that the radiation light and the signal light are not emitted from an end surface other than an end surface on the outputting side of the substrate 1a, which functions as a light guiding unit.
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