Polarization-maintaining optical fibre and preform and method for producing the same

US9720264B2 · kind B2 · utility

Assignee

• J-FIBER GMBH · DE

Inventors

• Thomas Gutsche · Jena, DE
• Wolfgang Hämmerle · Jena, DE
• Robert Hanf · Eisenberg, DE
• Lothar Brehm · Jena, DE

Key dates

• Filing date: May 6, 2015
• Grant date: Aug 1, 2017
• Expiry date: May 6, 2035

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P40/57
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a method for producing a polarization-maintaining optical fiber, consisting of a core region and stress-generating elements embedded in the fiber body, having the following method steps: producing a core preform for the core region using internal deposition on a substrate tube, the internally coated substrate tube subsequently being collapsed, generating recesses on the core preform by virtue of the material on the outer surface of the core preform being removed parallel to the longitudinal axis of the core preform at diametrically opposed positions, filling the recesses with stress-generating rods, with the tightest possible rod packing, in a freely selectable first filling geometry, possibly filling the recesses in addition with non-stress-generating rods in a second filling geometry, sheathing the filled core preform with a jacketing tube, preparing the sheathed core preform for a fiber-drawing process, and drawing the sheathed arrangement to form the optical fiber. A preform for producing a polarization-maintaining optical fiber contains a core preform, having a core region and a lateral region, and also contains a jacketing tube, which encloses the cor…