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Browse Prior Art Database

Refractive Index Lowering of the Cladding for Optical Fiber Waveguides

IP.com Disclosure Number: IPCOM000084251D
Original Publication Date: 1975-Oct-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Pliskin, WA: AUTHOR

Abstract

In fiber optical waveguides, the outer portion or cladding material should be of lower refractive index than the core to allow light guidance in the fiber. Since optical attenuation in fused silica is small, it has been suggested that borosilicate glass is useful as the cladding material for silica cores and that with proper quenching, the refractive index of the BSG (borosilicate glass) would be less than that of the fused silica.

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Refractive Index Lowering of the Cladding for Optical Fiber Waveguides

In fiber optical waveguides, the outer portion or cladding material should be of lower refractive index than the core to allow light guidance in the fiber. Since optical attenuation in fused silica is small, it has been suggested that borosilicate glass is useful as the cladding material for silica cores and that with proper quenching, the refractive index of the BSG (borosilicate glass) would be less than that of the fused silica.

Better control of the lowering of the refractive index of the cladding material can be obtained, by heating or annealing the fibers at elevated temperatures in a controlled humidity atmosphere. At higher humidities more boron trioxide (B(2)O(3)) would be leached out of the BSG, leaving behind a somewhat more "porous" BSG which would result in a lower refractive index cladding. This lower refractive index will be in the outer portions of the fiber, and thus produces an excellent clad optical fiber.

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