| 摘要 |
In a planar-waveguide-type optical circuit 1 , a reflection filter 4 is placed inside an oblique groove 3 formed to traverse optical waveguides 2 <SUB>n</SUB>. Reflected light from the reflection filter 4 is detected by photodetectors 61 <SUB>n </SUB>of a photodetector array 6 , and thereby light intensity of signal light is monitored. A glass substrate made of glass material having a refractive index substantially identical to that of a core 20 of the optical waveguide 2 <SUB>n </SUB>and filter fixing resin 5 fixing the reflection filter 4 is used for a substrate 10 of the optical circuit 1 constituting part of the groove 3 . This inhibits reflection of light in various regions of the groove 3 , thereby reducing generation of extra scattered light inside the groove 3 and its confinement. An optical waveguide module capable of enhancing monitoring characteristics of the signal light is thus realized.
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