Patent · US Active

Methods for making a graded-index multimode preform and fiber

US9249046B2 · kind B2 · utility

0Cited by

2References

6Claims

0Family size

Assignee

J-FIBER GMBH · DE

Inventors

Christian Genz · Jena, DE
Wolfgang Haemmerle · Jena, DE
Lothar Brehm · Jena, DE

Key dates

Filing date	Jul 18, 2013
Grant date	Feb 2, 2016
Priority date	—
Expiry date	Oct 5, 2033

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC03B2207/70
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

Methods for making a preform for a graded-index multimode fiber by using an inside deposition process are disclosed. The methods are characterized by an iterative refractive index profile correction with the following steps: determining a target refractive index profile for the preform to be produced, carrying out an inside deposition process with fixed volume flows for the reacting gases inside a tube and a given burner speed for all deposited layers, collapsing the tube and measuring the actual refractive index profile, comparing the target profile with the actual profile and calculating a correction value of index differences, converting this correction value in corrected burner speeds as varying process parameter, carrying out a inside deposition process with fixed gas flows and corrected burner speeds for all layers to be deposited.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.