| 摘要 |
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.
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