Optical path-length equalizer with graded refractive index

Details Optical path-length equalizer with graded refractive index Optical path-length equalizer with graded refractive index

1977-05-03

1979-01-16

Sacher, Paul A.

350 9618, 350 9631, G02B 514

Patent

active

041346394

ABSTRACT:
Signals, especially short pulses, are transmitted by way of cascaded light guides with internally reflecting boundaries (i.e. fibers or foils) between which a transparent body of graded refractive index is interposed. The refractive index of the body varies, on opposite sides of a centerline coinciding with the axes of the aligned guides, according to a parabolic law, increasing from the centerline outwardly over a radial distance r.sub.o and then decreasing in a symmetrical manner over a like radial distance, whereby light rays incident at various angles on an entrance face of the body are deflected onto a generally sinusoidal path which peaks at a radial distance 2r.sub.o. The axial length of the body equals three quarter-wavelengths of the sine curve whereby substantially axially incident rays emerge from an exit face of the body at a limiting angle .theta..sub.M, and vice versa, the radial distance r.sub.o being given by r.sub.o = s.multidot.tan .theta..sub.M where s is the axial distance between the confronting ends of the light guides and the adjoining body faces.

REFERENCES:
patent: 3980391 (1976-09-01), Stewart

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