Round birefraction dielectric wave-guide
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United States of America Patent
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-
Jul 19, 1988
Grant Date -
N/A
app pub date -
Jul 22, 1986
filing date -
Jul 26, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A round birefraction dielectric wave-guide has in section a central round zone with a constant, or substantially constant, refractive index n1, an outer zone preferably with a constant refractive index n2 and an intermediate zone divided into 8 (or multiples of 8) angular sectors. Respective alternate sectors have refractive indices n3 and n4. Refractive index n3 may be constant but index n4 varies in inverse proportion to the square of the distance from the axis of the waveguide. N1 is greater than n2, n1 is greater tha n3 and n4 lies between n1 and n2. The wave-guide is subjected to torsion around the longitudinal axis of symmetry thereof and/or is spirally wound around a cylinder.
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