Germanium-free optical fibers having large numerical apertures

Details Germanium-free optical fibers having large numerical apertures Germanium-free optical fibers having large numerical apertures

1983-06-27

1986-03-04

Sikes, William L.

350 9631, G02B 600, G02B 618

Patent

active

045737622

ABSTRACT:
An optical fiber of germanium-free, multicomponent glasses has a core glass which has the molecular composition: SiO.sub.2 : 57.5-65%; (ZrO.sub.2 +1/2Y.sub.2 O.sub.3): 0-5%; (MgO+CaO+SrO+BaO+ZnO): 12.5-27.5 where MgO: 0-5%, CaO: 0-10%, SrO: 0-7.5%, BaO: 0-15% ZnO: 0-20%, and in which if no BaO is present, the ZnO content is 12.5-20%, and if no ZnO is present, the BaO content is 5-15%, and (Li.sub.2 O+Na.sub.2 O+K.sub.2 O): 10-25%. The core glass has a K.sub.2 O content which is preferably smaller than half of the total alkali metal oxide content. The cladding glass consists of a silicate glass or a borosilicate glass having a refractive index which is at least 2% lower than the refractive index of the core glass. The viscosity of the cladding glass at the processing temperature is 0.5 to twice the viscosity of the core glass expressed in Pa.s.

REFERENCES:
patent: 4264131 (1981-04-01), Sawamura et al.
patent: 4265667 (1981-05-01), Ikeda et al.
patent: 4367012 (1983-01-01), Ikeda et al.
patent: 4418985 (1983-12-01), Kasori et al.

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