Method of making compound-glass optical waveguides fabricated by a metal evaporation technique
US3971645A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 1975 |
| Grant date | Jul 27, 1976 |
| Priority date | — |
| Expiry date | Sep 12, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B2201/54
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Glass fiber optical-waveguides consisting of a metal oxide-silicate glass core and silica cladding are produced according to the invention by means of a metal evaporation technique. An evacuated fused silica tube containing an evaporated metal deposit is heated to temperatures sufficient to form a uniform metal silicide layer on its inner surface. This layer is then oxidized and reacted with the silica tubing at elevated temperatures to form a metal oxide-silica glass layer. The tube is then collapsed to give a solid rod preform with a metal oxide-silica glass core. Fibers drawn from such preforms exhibit a graded refractive index profile and low loss. The details of the fabrication technique are described, and a representative loss spectrum is presented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.