Optical space communicating apparatus

摘要

An optical communicating apparatus has an optical transmitting unit and an optical receiving unit which are accommodated in the same casing. The apparatus is provided with a distributing circuit for supplying a power source to the optical transmitting unit and the optical receiving unit. A modulation device and a demodulation device are connected to the optical space communicating apparatus. The modulation device modulates a transmission signal and has a first power source unit to supply a power source to the distributing circuit. The demodulation device demodulates a reception signal and has a second power source unit to supply a power source to the distributing circuit. A switching device is arranged between the distributing circuit and the first power source unit or between the distributing circuit and the second power source unit. The switching device selects either one of the first and second power source units to connect the selected power source unit to the distributing circuit, so that the power source is applied to each unit in the apparatus through the distributing circuit.