| 摘要 |
PURPOSE:To obtain a reception output signal with high S/N by detecting directly the polarized state of an input signal from a detection signal to attain control. CONSTITUTION:In taking the distribution ratio of a signal power PS and a station light emitting power PL to a photodetector 6a in a polarized separator 5 respectively as AS, AL and the distribution ratio to a photodetector 6b as BS, BL, then the ratio is controlled so as to be AS=AL and BS=BL, an output of the controller 9 is applied to an optical modulator 3 as a modulation signal and the separated linearly polarized light is detected respectively by the photodetectors 6a, 6b, synthesized differentially by a differential synthesizer 7 and a received output signal is obtained at an output terminal 8. |
