Circular birefringent dielectric wave guide
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United States of America Patent
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Oct 16, 1990
Grant Date -
N/A
app pub date -
May 31, 1989
filing date -
May 31, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The wave guide has an annular core region divided into an integral number times eight annular sectors. Respective alternate sectors are of a first type 5 having a substantially constant refractive index and a second type 6 having a refractive index which varies substantially in inverse proportion to the square of the distance from the longitudinal axis 3 of the wave guide. The wave guide is twisted about the axis 3 such that the sectors 5, 6 extend helically. The circular birefringence of the wave guide is improved by the sectors 6 having a different elasto-optic coefficient under torsional stresses to that of the sectors 5.
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