Patent ID: 8045860

Claim:
An optical transceiver, comprising: a correction-data storage unit that stores therein a digital value of reference voltage obtained from a reference voltage source which supplies a reference voltage for an operation of a control circuit in preparing the optical transceiver; a reference-voltage converter that obtains, when a request for outputting the reference voltage is obtained from an external device connected with the optical transceiver after the preparation of the optical transceiver, the reference voltage from the reference voltage source, and converts the obtained reference voltage into a digital value; a variation calculating unit that calculates a variation of an output characteristic based on a difference between the digital value of the reference voltage converted by the reference-voltage converter and the correction data stored in the correction-data storage unit; an input-light-voltage converter that converts a current which fluctuates depending on an intensity of the input light, into a voltage, amplifies the voltage, and converts the obtained voltage into a digital value; and an output unit that corrects the digital value converted by the input-light-voltage converter based on the digital value of the voltage converted by the input-light-voltage converter and on the variation calculated by the variation calculating unit, and outputs the corrected digital value as a monitored value to the connected external device.