Aluminum metaphosphate optical fibers
AssigneeBell Telephone Laboratories, Incorporated
InventorsJames W. Fleming, Jr., John W. Shiever
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Abstract
Aluminum metaphosphate optical fibers are disclosed. In a specific embodiment, aluminum metaphosphate, doped with from 10 to 30 mole percent of diboron trioxide, is found to yield an optical fiber which combines the desirable properties of both high numerical aperture and low material dispersion. The fiber is nonhygroscopic and has a high melting temperature. The index of refraction of the glass may be lowered by doping with silicon dioxide. Consequently, a graded fiber may be made by increasing the concentration of silicon oxide from the core to the cladding.
Claims9
An optical fiber comprising a core and a cladding, the said fiber comprising aluminum metaphosphate, and in which fiber the molar ratio of aluminum to phosphorus is given substantially by the formula Al(PO.sub.3).sub.3.
Dependencies are inferred from the claim text.