Patent
1977-12-20
1980-01-29
Hille, Rolf G.
G02B 514
Patent
active
041858840
ABSTRACT:
A four port apparatus is described for multimode electro-optic switching with reduced voltages relative to that required by the prior art. Two optical waveguides formed on an electro-optic substrate are in parallel relationship for a predetermined length to establish a coupling region, throughout which they are separated by a barrier having an index of refraction formed by, that is, lower than the index of refraction of the optical waveguides. Electrodes extending over the length and thickness of the barrier are deposited on both sides of the electro-optic crystal to which voltages may be applied to provide optical coupling or relatively high optical isolation between the two optical waveguides.
REFERENCES:
patent: 3589794 (1971-06-01), Marcatilli
patent: 3976358 (1976-08-01), Thompson
E. A. Ash, M. L. Dakss, S. C-C. Tseng, "Switchable Optical Waveguide", IBM Technical Disclosure Bulletin, vol. 14, No. 3, Aug. 1971, pp. 999-1000.
R. A. Soref, D. H. McMahon, A. R. Nelson, "Multimode Achromatic Electro-optic Waveguide Switch . . .", Applied Physics Letters, vol. 28, No. 12, Jun. 1976, pp. 716-718.
I. P. Kaminow, L. W. Stulz, E. H. Turner, "Efficient Strip-Waveguide Modulator", Applied Physics Letters, vol. 27, No. 15, Nov. 1975, pp. 555-557.
Hille Rolf G.
Levine Seymour
Sperry Corporation
Terry Howard P.
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