Optical device utilizing magneto-optical effect

Details Optical device utilizing magneto-optical effect Optical device utilizing magneto-optical effect

1997-05-20

2000-01-25

Epps, Georgia

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359280, 359281, 359282, 359284, G02F 109

Patent

active

060184116

ABSTRACT:
The present invention provides an optical device making use of a magneto-optical effect. The optical device comprises: a reflector for reflecting an input beam as a reflected beam; a magneto-optical crystal provided so as to pass the input and reflected beams; a first unit for applying a magnetic field to the magneto-optical crystal; and a second unit for varying the magnetic field in accordance with a control signal. The configuration described above allows a small magneto-optical crystal to be used and, thus, a small-size and a low-cost Faraday rotator to be provided. By adding a polarizer to such a Faraday rotator, a variable optical attenuator can be obtained. In particular, by employing a wedge plate as the polarizer, a polarized-independent optical attenuator can be provided.

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