Faraday rotator and optical device employing the same

Details Faraday rotator and optical device employing the same Faraday rotator and optical device employing the same

1997-02-20

1998-12-01

Epps, Georgia Y.

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359251, G02F 109

Patent

active

058447105

ABSTRACT:
A Faraday rotator capable of maintaining a Faraday rotation angle always constant regardless of temperature variations. The Faraday rotator includes a magneto-optic crystal provided in a light propagation path, a permanent magnet for generating a magnetic field parallel to the light propagation path, and an electromagnet for generating a magnetic field orthogonal to the light propagation path. The strength of a synthetic magnetic field by the permanent magnet and the electromagnet is set to a magnitude large enough to magnetically saturate the magneto-optic crystal. The electromagnet is driven by a drive circuit. The Faraday rotator further includes a temperature sensor provided adjacent to the Faraday rotator, and a controller incorporating data on temperature dependence of a Faraday rotation angle of the magneto-optic crystal to control the drive circuit so that the Faraday rotation angle becomes constant according to a temperature detected by the temperature sensor.

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