Electrically controlled optical device
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United States of America Patent
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Jul 7, 1992
Grant Date -
N/A
app pub date -
Feb 14, 1990
filing date -
Feb 17, 1989
priority date (Note) -
Expired
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Abstract
An electrically controlled optical device includes a traveling wave electrode structure, a shield conductor and a thick buffer layer having a low dielectric constant. The thickness of an overlaid layer disposed between the traveling wave electrode structure and the shield conductor, as well as the thickness of the buffer layer, is determined so that the effective index of a microwave transmitted through the traveling wave electrode structure approaches the effective index of light transmitted through an optical waveguide, so that the microwave conductor loss is reduced, and so that the characteristic impedance of the traveling wave electrode structure approaches the characteristic impedance of an associated external microwave circuit.
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