Patent ID: 9490907
Filing Date: 2016-11-08
CPC Classification: H04B,H04J,H04Q

Claim Text:
1. An optical receiver to receive a multiplexed optical signal having a plurality of optical signals, comprising: an optical receiver module configured to have a plurality of photo detectors each converting an optical signal to a current signal, the optical receiver module outputting a current signal selected from a plurality of current signals; a detecting circuit configured to convert the current signal output from the optical receiver module into a voltage signal, output a first amplified signal obtained by amplifying the voltage signal by a first amplifying circuit with a first gain, and output a second amplified signal obtained by amplifying the voltage signal by a second amplifying circuit with a second gain larger than the first gain; and an MCU configured to output a selection signal to the optical receiver module to select one of the current signals, and to receive the first amplified signal and the second amplified signal each corresponding to the selected current signal, and to store intensity information of the first amplified signal as digital data with respect to the selected current signal, wherein the MCU switches the selection signal to acquire intensity information of the second amplified signal with respect to all of the current signals in an ascending order of the stored intensity information of the first amplified signal, and derives intensity information of each of the optical signals from the acquired intensity information of the second amplified signal.