HIGH-SPEED WAVELENGTH VARIABLE DISTRIBUTED FEEDBACK SEMICONDUCTOR LASER ARRAY, AND DISTRIBUTED FEEDBACK SEMICONDUCTOR LASER

PROBLEM TO BE SOLVED: To provide a broadband variable wavelength light source which is fully used for a DWDM system and also carries out high-speed wavelength switching in ms order, while enabling it to establish mass production organization and also utilize a DFB-LD simple in controlling mechanism. SOLUTION: A distributed feedback semiconductor laser array consists of: two or more distributed feedback semiconductor lasers under an identically controlled temperature; and an optical couplers which lead output light from two or more distributed feedback semiconductor lasers to one waveguide. The distributed feedback semiconductor laser array comprises a means for controlling the amount of inflow current of distributed feedback semiconductor lasers 21, and a means for measuring oscillating wavelength, wherein rough control of the wavelength of the distributed feedback semiconductor laser is performed by adjusting temperature, and after the temperature or wavelength of light entering within a desired limit, the trimming of the wavelength is performed by controlling the amount of inflow current by bringing the measured oscillating wavelength close to an oscillating target value. COPYRIGHT: (C)2008,JPO&INPIT