| 摘要 |
In order to suppress occurrence of a code error which occurs when an optical receiver detects a signal over a wide range of input intensity of the signal light by using a simple configuration, an optical receiver includes local light oscillation unit for generating a local oscillation light with a constant intensity, light mixing unit for mixing the local oscillation light and a first signal light and outputting the mixed light as a second signal light, light receiving unit for converting the second signal light into an electrical signal and outputting the electrical signal as a first electrical signal, amplifying unit for amplifying the first electrical signal with a predeteiniined gain and outputting the amplified signal as a second electrical signal, and a signal processing circuit for processing the second electrical signal, wherein the gain is set so that the amplitude of the second electrical signal may be within an allowable input amplitude range of the signal processing circuit. |
