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Proceedings Paper

A testbed for simultaneous measurement of fiber near and far-field for the evaluation of fiber scrambling properties
Author(s): Tobias Feger; Anna Brucalassi; Frank U. Grupp; Florian Lang-Bardl; Ronald Holzwarth; Ulrich Hopp; Ralf Bender
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Paper Abstract

To improve our understanding of fiber scrambling properties a test bed where fiber near-field and far-field can be measured simultaneously is described. A variety of measurements has been conducted with a selection of fibers from different vendors, including state-of-the-art octagonal and hexagonal fibers. After characterization of the test bench with respect to stability and resolution, scrambling measurements have been conducted using LEDs with central wavelengths ranging between 465-635 nm. The dependence on wavelength regarding to photometrical scrambling has been initially demonstrated. Moreover, two mechanical combined fiber cables have been analyzed that were made from octagonal-circular and hexagonal-octagonal fiber sections. In this context an apparatus for focal ratio degradation (FRD) measurements was assembled to compare different shaped fibers and fiber combinations. Finally, all these preliminary investigations will help in choosing a fiber with good radial scrambling performance for the next generation fiber-link of the fiber optic coupled Cassegrain echelle spectrograph FOCES intended to be operated at the 2.0m Fraunhofer Telescope at the Wendelstein Observatory.

Paper Details

Date Published: 24 September 2012
PDF: 14 pages
Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 844692 (24 September 2012); doi: 10.1117/12.925624
Show Author Affiliations
Tobias Feger, Univ.-Sternwarte München (Germany)
Anna Brucalassi, Max-Planck-institut für extraterrestrische Physik (Germany)
Frank U. Grupp, Max-Planck-institut für extraterrestrische Physik (Germany)
Univ.-Sternwarte München (Germany)
Florian Lang-Bardl, Univ. Observatory Munich (Germany)
Ronald Holzwarth, Max-Planck-Institut für Quantenoptik (Germany)
Ulrich Hopp, Univ.-Sternwarte München (Germany)
Ralf Bender, Max-Planck-institut für extraterrestrische Physik (Germany)
Univ.-Sternwarte München (Germany)

Published in SPIE Proceedings Vol. 8446:
Ground-based and Airborne Instrumentation for Astronomy IV
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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