| 摘要 |
A laser device capable of preventing deterioration of a light signal and a controlling method therefor are provided. A wavelength tunable laser module provided with a resonator including the wavelength tunable filter and a semiconductor light amplifier having a phase adjustment region and a light amplifying region, in which a wavelength margin between a peak transmission wavelength of a wavelength tunable filter and a mode hop occurring wavelength on a short wave side is smaller than that on a long wave side includes: a wavelength tunable laser module controller including an optical output sampling portion for detecting light intensity of light emitted from the resonator, a dither signal source for generating a dither signal for varying a phase adjustment signal to be applied to the phase adjustment region so that the detected light intensity becomes the maximum, and an FM signal source for generating an FM signal for oscillating the phase adjustment signal to be applied to the phase adjustment region with a period shorter than a variation period of the dither signal. The optical output sampling portion detects the light intensity in synchronization with oscillation of the phase adjustment signal by the FM signal.
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