Unidirectional mode converter and optical isolator using same

Details Unidirectional mode converter and optical isolator using same Unidirectional mode converter and optical isolator using same

1991-02-20

1992-01-07

Healy, Brian

Optical waveguides

Polarization without modulation

385 47, 385131, 359280, 359282, 359109, G02B 610, G02B 530, G02F 100

Patent

active

050785125

ABSTRACT:
An optical isolator in which a mirror is arranged in the waveguide path to provide Fresnel reflection of the propagating light and change the light path direction by 90 degrees, the light path from the waveguide input plane to the mirror forms a first region in which magneto-optic-induced non-reciprocal mode conversion takes place, and the part of the light path from the mirror to the waveguide output plane forms a second region in which reciprocal mode conversion takes place, and mode selectors or polarizers are provided at the light input and output planes.

REFERENCES:
patent: 3995936 (1976-12-01), Hepner et al.
patent: 4575179 (1986-03-01), Lee et al.
patent: 4707058 (1987-11-01), Tolksdorf et al.
patent: 4712855 (1987-12-01), Tolksdorf et al.
patent: 4859014 (1989-08-01), Schmitt et al.
patent: 4877298 (1989-10-01), Teng et al.
patent: 4898440 (1990-02-01), Tamada et al.
patent: 4973119 (1990-11-01), Taki
Applied Physics Letters, vol. 53, Jul. 4, 1988, No. 1, pp. 4-6, K. Ando et al., "Waveguide Magneto-Optic Isolator Fabricated by Laser Annealing".
Applied Optics, vol. 26, No. 18, Sep. 15, 1987, pp. 3811-3817, H. Hemme et al., "Optical Isolator Based on Mode Conversion in Magnetic Garnet Films".

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