Mode filter with refractive index modification

US9360617B2 · kind B2 · utility

Assignees

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE
• Fried-Schiller-Universitaet Jena · DE

Inventors

• Christian Voigtlaender · Jena, DE
• Jens Ulrich Thomas · Mainz, DE
• Robert Williams · Bandera, US
• Stefan Nolte · Jena, DE
• Andreas Tuennermann · Jena, DE

Key dates

• Filing date: Sep 27, 2012
• Grant date: Jun 7, 2016
• Expiry date: Sep 27, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/03633
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The invention relates to a mode filter for reducing higher-order modes, with an optical fiber (1), which has a core (2) and a cladding (3) surrounding the latter, wherein the cladding (3) and core (2) have refractive indices that differ from one another. In order to develop an alternative to the prior art, the mode filter according to the invention is designed in such a manner that the fiber (1) has, in a transition region (4) between core (2) and cladding (3), at least one local refractive index modification region (5) which is arranged in the radially outer region of the core (2) and extends into the region of the cladding (3).