1975-09-12
1977-07-05
Corbin, John K.
350 96GN, 350175GN, G02B 514
Patent
active
040336670
ABSTRACT:
A multimode optical fiber waveguide with graded refractive index for lessening modal dispersion depends upon simultaneous grading of both P.sub.2 O.sub.5 and B.sub.2 O.sub.3 within an otherwise generally unmodified silica glass. P.sub.2 O.sub.5 is at a maximum in the axial core region, while B.sub.2 O.sub.3 is generally the only modifier in the peripheral core region. The defined profile, which depends critically upon P.sub.2 O.sub.5 content in the axial composition and somewhat less critically upon the B.sub.2 O.sub.3 peripheral composition content, is near optimum from the standpoint of mode dispersion and remains so for the entire useful range of carrier wavelength (generally defined as from 0.5 to 1.1 .mu.m). Numerical aperture for fibers of the invention are typically at a level of 0.3.
REFERENCES:
patent: 3614197 (1973-10-01), Nishizawa et al.
patent: 3823997 (1974-07-01), Gloge et al.
patent: 3904268 (1975-09-01), Keck et al.
Macchesney; J. B., O'Conner; P. B., Presby; H. M., "A New Technique For Preparation of Low Loss . . . " Proc. of IEEE, Sept. 1974, pp. 1280-1281.
Payne; D. N., Gambling, "New Silica-Based Low-Loss Optical Fibre" Elect. Lett. vol. 10, No. 15, July 25, 1974, pp. 289-290.
Bell Telephone Laboratories Incorporated
Corbin John K.
Hille Rolf
Indig George S.
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