| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of controlling a wavelength capable of obtaining a sufficient amount of wavelength shift with low light loss in a compact structure. SOLUTION: A wavelength variable laser device has a gain chip having a gain part 106 and a phase adjustment region 107, a current source 601 for making a positive current flow to the phase adjustment region, a voltage source 603 for applying negative voltage to the phase adjustment region, and a control part 601 for selectively driving the current source or the voltage source according to the direction of a wavelength shift. The control part drives the current source when the wavelength is to be shifted toward a shorter wavelength for the laser wavelength when the current source and the voltage source are in OFF and drives the voltage source when the wavelength is to be shifted to a longer wavelength. COPYRIGHT: (C)2009,JPO&INPIT
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