WAVELENGTH VARIABLE LIGHT SOURCE, CONTROL METHOD FOR WAVELENGTH VARIABLE LIGHT SOURCE, AND MANUFACTURING METHOD OF WAVELENGTH VARIABLE LIGHT SOURCE

摘要

PROBLEM TO BE SOLVED: To provide a wavelength variable light source which suppresses wavelength drift by keeping a temperature at a temperature observation point constant before and after wavelength switching by an injection current amount operation onto a semiconductor laser and suppressing slow thermal fluctuation caused by a slow response of a temperature control element (Peltier element).;SOLUTION: In the wavelength variable light source, on a laser sub-mount that is disposed on the temperature control element, a semiconductor laser, a temperature observation element, and a thermal compensation region are disposed in this order via a semiconductor substrate and a temperature observed by the temperature observation element is controlled to be constant by the temperature control element. A control part previously calculates and stores power to be inputted to the semiconductor laser before and after the wavelength switching and power to be inputted to the thermal compensation region before and after the wavelength switching for cancelling a heat generation amount change caused by the power inputted to the semiconductor laser. During the operation, the power that is stored before and after the wavelength switching is inputted to the semiconductor laser and the thermal compensation region.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2016,JPO&INPIT