| 摘要 |
PROBLEM TO BE SOLVED: To provide a time-sharing bidirectional optical communication module at low cost by using a light-receiving element common to a receiving unit and a monitor, and conventional receiving and transmitting ICs without modifications. SOLUTION: A module 10 includes a light-emitting element 1 for generating a transmitting light signal, a collecting lens 4 for coupling the transmission light signal T of the light-emitting element 1 with a optical waveguide 5, a light-receiving element for receiving a receiving light signal R from the optical waveguide 5, and a monitoring light-receiving element for monitoring the luminescent intensity of the light-emitting element 1. The light-receiving element and the monitoring element include a common light-receiving element 2. A transistor 7 and a first resistor R1 for changing a voltage are connected to the light- receiving element 2 at a position, to which a receiving IC 8 via a second resistor R2 and a transmitting IC via a third resistor are connected. Then, a time-sharing bidirectional light communication transmitting and receiving unit can be obtained. |
