| 摘要 |
PROBLEM TO BE SOLVED: To receive space light at a high level, while suppressing the increase of weight of the transmitter by controlling the phase of 2nd output light, so that the phase of 1st output light and the phase of the 2nd output light are in-phase, based on a receiving signal. SOLUTION: A level of a composited optical signal in an optical receiver 19 can theoretically be doubled, by making phases of 1st and 2nd optical signals PR1 and PR2, which are outputted from two units of 1st and 2nd light antennas 11 and 115 in-phase. Thus, a light phase control circuit 20 outputs a control signal SC so as to make a receiving signal SR become a maximum value with respect to a light phase controller 17. With this, in the controller 17, the phase of the signal PR2 is in-phase with the phase of the signal PR1. That is, the controller 17, the receiver 19 and the circuit 20 perform feedback control, so that the signal SR becomes largest. |
