Patent ID: 9407061
Filing Date: 2016-08-02
CPC Classification: H01S,H04B,H04J

Claim Text:
1. An external-cavity type wavelength tunable laser comprising: a gain medium configured to generate an optical signal and amplify the generated optical signal based on a bias current applied; an external reflector configured to be coupled optically with the gain medium; a second thermistor provided on the side of the gain medium and configured to measure a temperature of the gain medium; a first thermistor provided on the external reflector and configured to measure a temperature of the external reflector; and a thermoelectric cooler configured to configured to transfer generated heat based on the temperatures measured by the first thermistor, wherein the external reflector comprises a heater electrode for wavelength adjustment and a phase control electrode for phase control, and the external reflector controls an output wavelength based on a relationship between the temperature measured by the second thermistor and an electrical power input to the heater electrode.