Method for the defined separation of a glass layer on an inner wall of a preform and preform and communication system

US10604440B2 · kind B2 · utility

Assignee

• J-FIBER GMBH · DE

Inventors

• Robert Hanf · Eisenberg, DE
• Christian Genz · Jena, DE
• Lothar Brehm · Jena, DE

Key dates

• Filing date: Jul 13, 2016
• Grant date: Mar 31, 2020
• Expiry date: Dec 31, 2036

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03B2207/70
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A method for a defined deposition of a glass layer on an inner wall of a preform for an optical fiber and/or for setting a refractive index profile of the preform for a multi-mode fiber. The method includes providing the preform having a cavity and an inner wall which defines an inner diameter of the preform, and spreading a deposition gas at a flow speed (v) in the cavity of the preform so as to provide the defined deposition of the glass layer. The defined deposition is performed at a reduced change in the flow speed a*Δv, where a<1. Based on the defined deposition, a change in the flow speed (Δv): forms at a volume flow (Q), a first diameter (di), and a second diameter (di+1).