| 摘要 |
PURPOSE:To improve the SN of the output of a photodetector in the optical circuit which is optically connected with a semiconductor light emitting element and a semiconductor light receiving element in proximity to each other to the end face of an optical waveguide. CONSTITUTION:A shielding plate 8 is installed between the optical waveguide 2a optically connected to a semiconductor light source 4 and the optical waveguide 2b optically connected to a semiconductor photodetector 5. Then, the incidence of the leak light from the light output of the semiconductor light source and the guided light of the optical waveguide to the semiconductor detector is decreased and the SN of the output of the photodetector is improved. |
