Patent ID: 7646986
Filing Date: 2010-01-12
Classification: H04B

Abstract:
1. An optical receiving device for receiving an optical signal transmitted via space as a medium, the optical receiving device comprising: a condensing section for condensing the received optical signal; an optical element including a transmission region and a deflecting region, and receiving the optical signal, which has been condensed through the condensing section; a signal light receiving section for receiving transmitted light, which has been transmitted through the transmission region, and performing a photoelectric conversion on the received light; a detection light receiving section for receiving deflected light, which has been deflected through the deflecting region, and performing a photoelectric conversion on the received light to thereby output a detection intensity signal that indicates an intensity of the deflected light; an optical axis detection section for detecting an optical axis misalignment based on the detection intensity signal outputted from the detection light receiving section to output an optical axis detection signal; and an optical axis adjustment section for performing an optical axis adjustment based on the optical axis detection signal, wherein: the optical element is located between the condensing section and the signal light receiving section so that a central axis of the signal light receiving section is generally aligned with that of the transmission region; and the deflecting region receives leak light being a portion of the optical signal and being caused by an optical axis misalignment, and outputs deflected light to the detection light receiving section.