Optical fiber with depressed index outer cladding

Details Optical fiber with depressed index outer cladding Optical fiber with depressed index outer cladding

1984-11-13

1987-09-08

Sikes, William L.

350 9634, G02B 622

Patent

active

046919902

ABSTRACT:
Single mode and multimode silica-based optical fibers having a down-doped outer cladding are disclosed. The outer cladding material is derived from a preexisting silica tube that comprises an amount of index-lowering dopant, typically F or B, sufficient to result in an effective refractive index of the material that is at least about 0.001, preferably at least 0.0025, lower than the refractive index of SiO.sub.2. Single mode optical fiber according to the invention typically requires a smaller amount of deposited cladding material than an equivalent prior art fiber, and thus can be produced more economically. Multimode optical fiber according to the invention may have lower core doping or higher NA than equivalent prior art fiber. Down-doped substrate or sleeve tubes advantageously are produced by a gel process.

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IEEE Journal of Quantum Electronics, vol. QE-18, No. 10, Oct. 1982, "Radiating Leaky-Mode Losses in Single-Mode Lightguides with Depressed-Index Claddings", pp. 1467-1472, by L. G. Cohen et al.
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