| 摘要 |
The objective of the present invention is to provide with is to provide with a tunable laser module capable of adequately detecting the decay of the large variation in the wavelength of the light and then operating the shutter. The tunable laser module 1 comprises a tunable laser source 11ˆ¼13 capable of emitting light with a wavelength defined by wavelength control signal, and following controllers 14ˆ¼17, 18ˆ¼23, 24ˆ¼28. A temperature controller 14ˆ¼17 operates to perform the control of the temperature of the tunable laser source 11ˆ¼13. A wavelength controller 18ˆ¼23 operates to perform the control of the wavelength of the light emanating from the tunable laser source 11ˆ¼13. A power controller 24ˆ¼28 operates to perform the control of the power of the tunable laser source 11ˆ¼13. The tunable laser module 1 further comprises a stability discriminator 29, optical switch 30, 31, an optical terminator 32 for absorbing light entering herein, and an optical connector 33 for coupling its incident light with an external transmission line. The stability discriminator 29 discriminates whether the wavelength and the temperature are stable or not, based on both temperature control signal and wavelength control signal. When having discriminated that their stability was achieved, the discriminator 29 generates enable signal. The optical switch 30, 31 is capable of switching the optical path of the light emanating therefrom when receiving the enable signal.
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