Laser device and controlling method therefor

Details Laser device and controlling method therefor Laser device and controlling method therefor

2011-08-16

2011-08-16

Stultz, Jessica T (Department: 2828)

Coherent light generators

Particular beam control device

Optical output stabilization

C372S028000, C372S029016, C372S038010

Reexamination Certificate

active

08000359

ABSTRACT:
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.

REFERENCES:
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patent: WO 2007/007848 (2007-01-01), None
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Koji Kudo et al., “Recent Progress on The Wide-Band Wavelength Tunable Lasers and Modules”, IEICE Technical Report OPE, Aug. 25-30, 2005.
Search Report issued in European Patent Application No. 08021393.7 on Jul. 29, 2010.

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