Optical waveguide module

An optical waveguide module comprising:

• an optical circuit configured to include a substrate and an optical waveguide provided on said substrate, and having a groove formed to traverse a predetermined position of said optical waveguide;
• a reflection filter, placed inside said groove of said optical circuit to span a region through which signal light propagated in said optical waveguide passes, for reflecting part of said signal light at a predetermined reflectance;
• filter fixing resin for fixing said reflection filter by filling at least inside of said groove for seal thereof;
• and
• a photodetector for detecting reflected light which is part of said signal light reflected by said reflection filter, wherein
• said filter fixing resin is formed with resin material having a higher refractive index than that of a core of said optical waveguide with respect to said signal light having a wavelength within a predetermined signal light wavelength band.