Patent ID: 9577757
Date: 2017-02-21
CPC Classifications: H01L,H01S,H04B

Claim:
1. An optical transmitter having a function of answering an internal temperature to an external device, comprising: an optical transmitter module including at least one active element configured to generate heat by energization, a thermoelectric element configured to heat or cool the active element, a thermal sensor configured to sense a temperature of the active element, and a package configured to house the active element, the thermal sensor, and the thermoelectric element, the active element being thermally coupled with an outside of the package through a plurality of electric wires connected with a plurality of terminals of the package; an arithmetic processing circuit configured to control the energization of the active element; a storage device configured to store data, the data being accessible from the arithmetic processing circuit; and a temperature detection circuit configured to detect the internal temperature and output data of the internal temperature, wherein the arithmetic processing circuit stores the data output from the temperature detection circuit to the storage device as the internal temperature when the active element is being energized, and calculates data of the internal temperature based on the basis of both the temperature detected with the thermal sensor and the data stored in the storage device, and stores the calculated data to the storage device as the internal temperature when the active element is not being energized.