| 摘要 |
PURPOSE:To allow an optical spatial transmission system to be supervised from a master station side by transmitting a signal of a slave station while being superimposed on a reflected light, reproducing this signal at the master station and also reproducing a signal of the master station returned by reflection and comparing the reproduced signal with the transmitted signal. CONSTITUTION:The light beam branched at a splitter 34 is reflected in parallel with an incident light at a triangular pyramid form reflector 37 (corner cube prism) whose reflecting plane is formed at a right angle to each other, for example. The signal of the slave station is transmitted to the master station by superimposing an optical modulating wave modulated at an optical modulator 38 on the reflected light. An optical demodulator 40 reproduces a signal returned by being reflected on the corner cube prism and this is applied to an error detector 41. The error detector 41 compares this signal with a signal outputted from a signal processor 32. When the result is coincident, the matching of the optical axes between the master station and the slave station is informed to the signal processor 32. If dissident, an output of error detection is given to the signal processor and the control of signal retransmission or the like is attained. |
