Thin film magneto-optic mode converters

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350151, G02B 514

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active

040322165

ABSTRACT:
Mode conversion of optical signals in thin film optical devices is obtained in a region of Faraday effect magnetic material waveguide by providing a periodic structure in which alternate half cycles have the magnetization parallel to the propagation direction to turn on the Faraday effect to induce mode conversion and in which the intervening half cycles have the magnetization perpendicular to the propagation direction to turn off the Faraday effect to prevent mode conversion. Stripe domains are preferably used to turn the Faraday effect off. Non-reciprocal mode conversion is obtained by optically coupling an anisotropic crystal to the waveguide to provide a quantity of mode conversion equal to that provided by the Faraday effect.

REFERENCES:
giess et al. "Magneto Optical Waveguide," IBM Tech. Disc. Bulletin, vol. 17, No. 9.
Tien "Integrated Optics," Scientific American, vol. 230, No. 4, Apr. 1974, pp. 28-35.
Henry "Thin-Film Optical Magnetic Mode Converters," App. Phys. Letts., vol. 26, No. 7, Apr. 1975, pp. 408-411.
Tien et al. "Switching & Modulation of Light in Magneto-Optic Waveguides of Garnet Films," App. Phys. Letts., vol. 21, No. 8, Oct. 1972, pp. 394-396.
Hepner et al. "Magneto-Optic Effects in Garnet & Thinfilm Waveguides," App. Optics, vol. 14, No. 7, July 1975, pp. 1479-1481.

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