1975-09-12
1976-11-02
Corbin, John K.
350 96GN, 350175GN, G02B 514
Patent
active
039893502
ABSTRACT:
A multimode optical fiber waveguide with graded refractive index for lessening modal dispersion with the gradient produced at least in part by radially decreasing boron oxide content outwardly from the core center within a high silica glass core minimizes modal dispersion by use of a non-parabolic grading function. The optimum gradient for a simple binary borosilicate system for a wavelength of from approximately 0.5 to 1.1 micrometers corresponds with .alpha. = 1.77 .+-. 10 percent in the equation n = n.sub.1 [1-2.DELTA.(r/a).sup..alpha]sup.1/2, in which n.sub.1 is the axial core index r is the distance from the fiber axis, a is the core radius, .DELTA. is the relative index difference between core center and cladding and .alpha. is a power law exponent which characterizes the profile.
REFERENCES:
patent: 3823997 (1974-07-01), Gloge et al.
patent: 3904268 (1975-09-01), Keck et al.
J. B. Macchesney, P. B. O'Connor, H. M. Presby, "A New Technique for the Preparation of Low Loss . . ." Proc. of IEEE, Sept. 1974, pp. 1280-1281.
Cohen Leonard George
Fleming, Jr. James William
French William George
Bell Telephone Laboratories Incorporated
Corbin John K.
Hille Rolf
Indig George S.
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