Optical transceiver, optical communication apparatus, and method of controlling light receiving element

An optical transceiver comprising:

• a first temperature sensor;
• a second temperature sensor;
• an optical module including a light emitting element and a light receiving element;
• a transmission driver that drives the light emitting element, the second temperature sensor being thermally coupled to the transmission driver;
• and
• a casing that has thermal conductivity and accommodates the first temperature sensor, the second temperature sensor, the optical module, and the transmission driver, wherein
• a drive rate of the transmission driver is set as a,
• a temperature detected by the first temperature sensor is set as T1,
• a temperature detected by the second temperature sensor is set as T2,
• a temperature of a light receiving unit in the optical module is set as Tr, and
• a temperature error allowed for control of the light receiving unit in the optical module is set as Terr, and
• when, in a state in which an ambient temperature of the casing in a transmission on state of an optical signal by the light emitting element is a predetermined temperature,
• a value of Tr that can be estimated from T1 and T2 with a being a minimum value is set as Tmin, and
• a value of Tr that can be estimated from T1 and T2 with a being a maximum value is set as Tmax,
• an error in a measured value of Tr with respect to an estimated value of Tr is Terr or less, the estimated value being obtained by internally dividing Tmin and Tmax by a when a is a median value of the minimum value and the maximum value.

An optical communication apparatus comprising:

• a light emitting element;
• a transmission driver that drives the light emitting element;
• a light receiving element capable of changing a multiplication factor by a bias voltage;
• a temperature sensor;
• a computing unit that calculates a drive rate of the transmission driver;
• and
• an adjusting unit that adjusts the bias voltage applied to the light receiving element, wherein
• the adjusting unit adjusts the bias voltage by linear computation using a plurality of target values of the bias voltage for combinations of a plurality of temperatures and a plurality of drive rates, based on a temperature detected by the temperature sensor and a result of calculation of the drive rate.

A method of controlling a light receiving element in an optical communication apparatus including a light emitting element;

• a transmission driver that drives the light emitting element;
• a light receiving element capable of changing a multiplication factor by a bias voltage;
• and a temperature sensor, the method comprising the steps of;
• calculating a drive rate of the transmission driver;
• and
• adjusting the bias voltage applied to the light receiving element, wherein
• in the step of adjusting the bias voltage, the bias voltage is adjusted by linear computation using a plurality of target values of the bias voltage for combinations of a plurality of temperatures and a plurality of drive rates, based on a temperature detected by the temperature sensor and a result of calculation of the drive rate.