| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical receiver which suppresses the occurrence of PDL (polarization dependence loss) and hardly causes a leakage current in a photodetector as for the optical receiver mounting the photodetector on an optical waveguide substrate having an optical waveguide. SOLUTION: The optical receiver comprises the optical waveguide 12 on the optical waveguide substrate 10, a filter 14 inserted into a groove 13, a reflection surface 16 on a stand 15, the photodetector 17 and a sealing material 18. The sealing material 18 is applied on the upper surface of optical waveguide substrate, the reflection surface 16 and the photodetector 17 and has a refractive index close to the refractive index of a clad 12-2 of the optical waveguide 12. A part or all of light propagating from left to right on the figure in the optical waveguide 12 is reflected by a filter 14, is transmitted from the interface of the optical waveguide substrate 10 to the sealing material 18, is totally reflected by the reflection surface 16 and, thereafter, is made incident to the photodetector 17. There is almost no difference of refractive index on the interface between the surface part 12-2 of optical waveguide substrate and the sealing material 18, therefore, there is no polarization dependence of the reflectance and, as a result, the PDL of light can be avoided. COPYRIGHT: (C)2006,JPO&NCIPI
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