Patent ID: 9444220
Filing Date: 2016-09-13
CPC Classification: H01S

Claim Text:
1. A method for controlling a wavelength tunable laser, comprising steps of: setting a first wavelength at which the wavelength tunable laser lases; determining a target drive condition controlling a lasing wavelength by the target drive condition wherein the wavelength tunable laser provides a wavelength detection unit including an etalon, and the drive condition for determining the target drive condition includes a target value output from the wavelength detection unit and a temperature of the etalon at the second wavelength; wherein the step of determining the target drive condition includes a step to calculate the temperature of the etalon at the second wavelength; wherein the wavelength tunable laser includes a thermoelectric cooler (TEC); and wherein the step of controlling the lasing wavelength includes a step to control the TEC such that the etalon shows the target value in a front-to-back ratio thereof.