Monolithic faraday optical switch

Details Monolithic faraday optical switch Monolithic faraday optical switch

1987-11-05

1989-04-04

LaRoche, Eugene R.

350377, 350376, G02F 109

Patent

active

048180807

ABSTRACT:
A monolithic optical switch has one or more Faraday effect polarization rotation layers of bismuth doped gadolinium deposited on opposite sides of an optically inactive substrate. A non-magnetic reflecting surface is deposited on one side of the substrate over the rotator layer. A polarizing pair (crossed polarizer and analyzer elements) is deposited in a side-by-side arrangement over the Faraday rotator layer on the other side of the substrate. Plane polarized light from an optical fiber passes through the polarizer element, the rotator layer(s) and the substrate to the reflecting surface and is reflected back to the analyzer element on the other side. The presence of a magnetic field results in the rotation of the plane of polarization of the light so that passage of the reflected light through the analyzer to an output optical fiber depends on the presence or absence of the magnetic field.

REFERENCES:
patent: 4581579 (1986-04-01), Nagatsuma et al.
patent: 4735489 (1988-04-01), Tolksdorf et al.
Lin, B. J., "Bright and Versitile Magnetic Bubble Display Screen", IBM Technical Disclosure Bulletin, vol. 16, No. 11, Apr. 1979, pp. 3795-3796.
Lin et al., "Magnetic Bubble Domain Interactive Screen", IBM Tech. Disclosure Bulletin, vol. 17, No. 11, Apr. 1975, pp. 3489-3491.

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