H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 10/08 (2006.01) G01J 9/00 (2006.01) H01S 5/0687 (2006.01)
Patent
CA 2319546
A wavelength monitoring device comprising: a polarization state changing means having a first birefringent crystal, which inputs a polarized laser light and changes the polarization state of the input laser light after it is transmitted through the first birefringent crystal, in accordance with the wavelength of the input laser light, a polarized light selecting and receiving means, which inputs the laser light transmitted through the polarization state changing means and selectively receives a predetermined linearly polarized component, and a wavelength detection means for monitoring the wavelength of the laser light input to the first birefringent crystal by use of an optical signal output from the polarized light selecting and receiving means.
Selon l'invention, un cristal biréfringent émet un faisceau laser parallèle polarisé puis modifie l'état de polarisation du faisceau laser en fonction de la longueur d'onde. Un polariseur sépare le faisceau laser émis par le cristal biréfringent en composantes orthogonales à polarisation p et à polarisation s. Un premier photodétecteur reçoit la composante à polarisation p, tandis qu'un second photodétecteur reçoit la composante à polarisation s. Un circuit de détection de longueur d'onde contrôle la longueur d'onde du faisceau laser introduit dans le cristal biréfringent en fonction du signal lumineux produit en sortie par le premier photodétecteur et/ou le second photodétecteur.
Hirano Yoshihito
Imaki Masao
Masuda Kenji
Nakamura Takeshi
Satou Makoto
Kirby Eades Gale Baker
Mitsubishi Denki Kabushiki Kaisha
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