| 摘要 |
PROBLEM TO BE SOLVED: To reduce power consumption for spatical optical communication and to reduce interference and impairment to another spatial optical communication. SOLUTION: The directivity of a variable directivity light emitting part 13 of a first transmitter-receiver 10 is variably controlled by a directivity control part 16 of a control part 11. The intensity of received light at a light reception part 24 of a second transmitter-receiver 20 is detected by a received light intensity detection circuit 28 inside an optical signal reception processing circuit 25, sent out through a transmission drive circuit 22 and a transmission part 23 to be received at a reception part 14 of the first transmitter-receiver 10, and this received light intensity information is fetched by a reception processing circuit 15 and sent to the directivity control part 16 of the control part 11. The directivity control part 16 of the control part 11 controls the directivity of the variable directivity light emitting part 13 so that the intensity of received light at the second transmitter-receiver 20 becomes maximum. |
