Element for a preform, a fiber production method and an optical fiber drawn from the preform

US11072554B2 · kind B2 · utility

Assignee

• NKT PHOTONICS A/S · DK

Inventors

• Harald R. Simonsen · Springe, DE
• Christian Jakobsen · Frederiksdal, DK

Key dates

• Filing date: Nov 10, 2016
• Grant date: Jul 27, 2021
• Expiry date: Dec 26, 2036

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/02366
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A preform element, it production and fiber production methods from preform assemblies are disclosed. The preform element has a length and a center axis along its length, a first and second end defined by its length and an outer preform element surface. The preform element comprises a plurality of longitudinal structures disposed to form longitudinal hole(s) in a background material. At least one slot extending from its outer preform element surface and intersecting at least one of the longitudinal holes, wherein the at least one slot does not fully intersect the preform element. The preform element may be a preform center element or a preform ring element and may be assembled to a form part of a preform assembly for an optical fiber.