The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 16, 1979
Filed:
May. 03, 1977
Pietro Di Vita, Turin, IT;
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.