Faraday rotator and optical device comprising the same, and...

Details Faraday rotator and optical device comprising the same, and... Faraday rotator and optical device comprising the same, and...

2005-02-08

2005-02-08

Dang, Hung Xuan (Department: 2873)

Optical: systems and elements

Optical modulator

Light wave temporal modulation

C359S324000

Reexamination Certificate

active

06853473

ABSTRACT:
The invention relates to an optical device for polarizing light by changing its Faraday rotation angle, such as optical attenuators, optical switches or polarization controllers; and its object is to provide such an optical device which can be driven even by small-sized and power-saving magnetic circuits and in which the insertion loss in the Faraday rotator may be reduced. The optical device comprises a Faraday rotator formed of a garnet single crystal, and a magnetic circuit applying an external magnetic field H that is smaller than the saturation magnetic field Hs of the Faraday rotator to the Faraday rotator.

REFERENCES:
patent: 5640516 (1997-06-01), Iwatsuka et al.
patent: 5801875 (1998-09-01), Brandle et al.
patent: 5812304 (1998-09-01), Shirasaki et al.
patent: A 4-230701 (1992-08-01), None
patent: A 6-51255 (1994-02-01), None
patent: A 10-1398 (1998-01-01), None

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