Burst-mode receiver, and method of bias voltage control for APD of burst-mode receiver

摘要

A burst-mode receiver for receiving burst optical signals having different intensities by a reversely connected APD, including: a current detection circuit outputting a photocurrent that is generated by APD and is output from a current mirror circuit (CMC) as a voltage proportional to the photocurrent, the CMC being connected in series between a power supply and APD; a peak detector circuit detecting and holding a peak value of the output voltage of the current detection circuit; a resistor connection switching circuit, which is inserted between the CMC and APD, for connecting a series resistor to APD in series by switching; and a comparator outputting a switching signal for switching the resistor connection switching circuit so that the series resistor is connected to APD in series in a case where a voltage detected by the peak detector circuit is equal to or more than a predetermined threshold.

主权项

1. A burst-mode receiver for receiving burst optical signals having different intensities by a reversely connected APD, the burst-mode receiver comprising:
a current detection circuit for outputting a photocurrent that is generated by the reversely connected APD and is output from a current mirror circuit as a voltage proportional to the photocurrent, the current mirror circuit being connected in series between a power supply and the reversely connected APD; a peak detector circuit for detecting and holding a peak value of the output voltage of the current detection circuit; a resistor connection switching circuit, which is inserted between the current mirror circuit and the reversely connected APD, for connecting a series resistor to the reversely connected APD in series by switching; and a comparator for outputting a switching signal for switching the resistor connection switching circuit so that the series resistor is connected to the reversely connected APD in series in a case where a voltage detected by the peak detector circuit is equal to or more than a predetermined threshold.