Patent
1986-07-22
1988-07-19
Sikes, William L.
350 9610, 350 9629, G02B 600, G02B 610
Patent
active
047580666
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.
REFERENCES:
patent: 4415230 (1983-11-01), Keck
patent: 4478489 (1984-10-01), Blankenship et al.
patent: 4681399 (1987-07-01), Hicks, Jr.
Pirelli General plc
Sikes William L.
Ullah Akm E.
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