| 摘要 |
PURPOSE:To narrow the dynamic range required for an electric range required for an electric circuit such as a preamplifier, an AGC, etc., to be arranged in the rear stage of a photodetector for actualizing the wider range in the equivalent circuit. CONSTITUTION:The title optical signal receiving circuit using semiconductor lasers 1-1, 2-1 as photodetectors of the optical signals is provided with the photodetecting sensitivity control means 1-5, 2-5 of semiconductor lasers 1-1, 2-1 by adjusting the current running in the semiconductor lasers during the signal receiving step. |
