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Proceedings Paper

Light-guidance in step-index fibers with non-circular shaped core
Author(s): Jan Heimann; Philipp Raithel; Tim Tobisch; Mathias Belz; Karl-Friedrich Klein
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Paper Abstract

Step-index multimode fibers with non-circular core are becoming popular and offer several interesting new light-guiding properties, which can be studied with an emphasis on selective modes or ray patterns. Observing the far-field profile at the fiber output, ray-conversion can be determined, taking the azimuthal angle defined in respect to an adjusted reference into account. Using the inverse far-field method at one laser wavelength, the numerical aperture (NA) of these specialty fibers is determined as a function of excitation condition, such as input angle and rotation around the fiber axis. Further angledependent analysis of ring-shaped far-field pattern at the fiber output resulted in significant differences between the fibers with non-circular core shapes and classic circular fibers. In addition, with squared core fibers, the near- and farfield pattern at their respective fiber output were varying due to rotating the fiber around the fiber axis at their input side. Especially, a disturbance of the azimuthally homogenous ring shape was observed using input angles close to the numerical aperture of the fiber.

Paper Details

Date Published: 7 May 2015
PDF: 9 pages
Proc. SPIE 9507, Micro-structured and Specialty Optical Fibres IV, 95070R (7 May 2015); doi: 10.1117/12.2182346
Show Author Affiliations
Jan Heimann, TransMIT GmbH (Germany)
Philipp Raithel, TransMIT GmbH (Germany)
Technische Hochschule Mittelhessen (Germany)
Tim Tobisch, TransMIT GmbH (Germany)
Technische Hochschule Mittelhessen (Germany)
Mathias Belz, World Precision Instruments, Inc. (United States)
Karl-Friedrich Klein, TransMIT GmbH (Germany)
Technische Hochschule Mittelhessen (Germany)

Published in SPIE Proceedings Vol. 9507:
Micro-structured and Specialty Optical Fibres IV
Kyriacos Kalli; Jiri Kanka; Alexis Mendez, Editor(s)

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