| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical receiver for accurately measuring light-receiving power corresponding to multiplication factor fluctuation of an avalanche photodiode. <P>SOLUTION: A current corresponding to optical burst signals detected in an avalanche photodiode 14 is inputted from a current mirror circuit 15 to a current/voltage conversion circuit 20 and converted to a voltage. Of the voltage, one is applied to an analog/digital conversion circuit 22 to acquire a light-receiving power value Pp. The other is applied to a low-pass filter 30 and its low frequency component is applied to an analog/digital conversion circuit 32 to acquire an average light-receiving power value Prave. The light-receiving power value Pp and average light-receiving power value Prave are inputted to a control operation circuit 24, and the control operation circuit 24 corrects the value of the light receiving power value Pp using a correction coefficient k(Prave) corresponding to the latest average light-receiving power value set by a correction coefficient setting part 38. <P>COPYRIGHT: (C)2012,JPO&INPIT |
