Patent ID: 9094134
Filing Date: 2015-07-28
Classification: H03G,H04B

Abstract:
1. An optical receiver, comprising: a photodetector for converting a light reception signal into a current signal; a preamplifier for converting the current signal output from the photodetector into a voltage signal; gain control means for detecting an average voltage of the voltage signal output from the preamplifier by a first average voltage detection section that has a first time constant or a second average voltage detection section that has a second time constant longer than the first time constant, and controlling, with use of the detected average voltage, a conversion gain of the preamplifier to be a desired gain according to a reception level of the light reception signal; and convergence determination means for determining whether the gain control means is in a transient state or in a steady state, and generating a time constant switching signal for selecting the first average voltage detection section of the gain control means when it is determined that the gain control means is in the transient state and selecting the second average voltage detection section of the gain control means when it is determined that the gain control means is in the steady state, wherein the convergence determination means comprises: