Faraday rotator device and optical switch containing same

Details Faraday rotator device and optical switch containing same Faraday rotator device and optical switch containing same

1990-01-30

1991-09-17

Arnold, Bruce Y.

Optical: systems and elements

Optical modulator

Light wave directional modulation

333 241, 335301, 359484, G02F 109

Patent

active

050489372

ABSTRACT:
A Faraday rotator device containing (a) a Faraday rotator, (b) a wire winding encircling the Faraday rotator for changing the magnetization state of the Faraday rotator, and (c) a hollow yoke surrounding the Faraday rotator and the wire winding for forming a substantially closed magnetic circuit together with the Faraday rotator, the hollow yoke having an opening in each of front and rear walls in alignment with the Faraday rotator for permitting a light to pass through the hollow yoke and the Faraday rotator. The optical switch containing a pair of polarizers disposed on front and rear sides of the Faraday rotator device, the magnetization direction of the Faraday rotator being reversible to change the optical path. The hollow yoke is made of a soft magnetic material or a semi-hard magnetic material.

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Shirasaki et al., "Self Sustain Type Optical Switch for Single Mode Fiber," 1983 General Meeting of the Communication Association, 513-514, (partial translation).
Aoyama et al., "Optical Switch Comprising LPE-Grown GD-Doped YIG Thick Layer," 1983 General Meeting of the Communication Association, 2276, (partial translation).

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