Optical switching device
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United States of America Patent
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-
Mar 10, 1987
Grant Date -
N/A
app pub date -
Sep 30, 1982
filing date -
Oct 2, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical switching device for switching the transmission of light waves is provided. The main feature of the present invention is the usage of a light-transmitting, crystalline material having a temperature dependent index of refraction. That is, the light transmission condition is altered by controlling the temperature of such a material. In one form of the present invention, a main waveguide and a branched waveguide are provided and light waves are switched between the main and branched waveguides by controlling the temperature of a particlar portion of the intersection region. In another form of the present invention, a pair of waveguides is oppositely arranged in an end-to-end relation with a gap therebetween, and a switching region is defined in the gap. When the switching region is heated, the waveguides are optically connected; whereas, they are optically disconnected at normal temperature condition.
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