Method of making polarization retaining single-mode optical waveguide
US4360371A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1981 |
| Grant date | Nov 23, 1982 |
| Priority date | — |
| Expiry date | Mar 30, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B2203/31
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A single mode optical waveguide is fabricated in a manner such that the core thereof is subjected to a stress-induced birefringence. A hollow intermediate product is formed by depositing layers of cladding and core glass on the inner surface of a substrate tube. Opposite sides of the intermediate product are heated to cause it to collapse into a solid preform foreproduct having an oblong cross-section. A layer of flame hydrolysis-produced soot having a circular outer surface is deposited on the preform foreproduct and is consolidated to form a dense glass cladding layer thereon. The TCE of the outer cladding layer is different from that of the preform foreproduct on which it is deposited so that when the resultant preform is drawn into a fiber, a stress-induced birefringence exists in the core.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.