Optical waveguide isolator

Details Optical waveguide isolator Optical waveguide isolator

1989-06-19

1990-11-27

Healy, Brian

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

350 9612, 350 9614, 350375, 350377, 455602, G02B 610, G02B 530, G02F 100

Patent

active

049731190

ABSTRACT:
An optical isolator serving as a unidirectional waveguide for preventing light reflected by various optical devices from being applied to a semiconductor laser. The optical isolator includes a mode converter for effecting a mode conversion of a light beam. The mode converter comprises a magnetic thin film having magnetooptic effects, and a substrate having a refractive index relatively close to the refractive index of the magnetic thin film. The mode converter is magnetized in a direction lying in a plane substantially normal to the direction in which light is propagated through the mode converter and inclined to the surface of the magnetic thin film.

REFERENCES:
patent: 3822927 (1974-07-01), Zernike
patent: 3830555 (1974-08-01), Warner
patent: 3860325 (1975-01-01), Matsushita et al.
patent: 3995936 (1976-12-01), Hepner et al.
patent: 4707058 (1987-11-01), Tolksdorf et al.
patent: 4712855 (1987-12-01), Tolksdorf et al.
patent: 4798434 (1989-01-01), Dammann et al.
patent: 4898440 (1990-02-01), Tamada et al.

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