| 摘要 |
PROBLEM TO BE SOLVED: To enhance an S/N ratio by preventing light signals for communication from intefering at the time of bidirectional optical communication. SOLUTION: This bidirectional optical communication module using a single core fiber and the optical communication system using the module have on the same substrate a light emitting element 4 for generating signal light, a transmitting optical waveguide 7a for guiding the signal light from the element 4 to an optical fiber 3, a light receiving element 5 for receiving the signal light to convert it into an electric signal, and an receiving optical waveguide 7b for guiding the signal light from the optical fiber 3 to the element 5. The waveguides 7a, 7b are provided optically independently, the waveguide 7a is formed into an L-shape, one side of the L-shape has a function as a transmitting waveguide, and the other side of it has a function as a shielding plate. A light output from a light emitting element source and leaked light from the transmitting waveguide get incident reducedly into a photodetector to enhance an S/N ratio of a photodetector output. |
