27 April 2016 Analysis of spectral light guidance in specialty fibers
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A novel experimental set-up for measuring the spectral dependency of light-guidance of specialty non-active multimodefibers will be introduced. Light coupling into the test fiber is realized and controlled with a micro-structured single mode (SM) fiber and an image-system based on a microscope objective The far- and near-field profiles of the SM-fiber will be shown. The inverse far field method is modified and improved by using three wavelengths simultaneously under the same input conditions; the coupling conditions into the test-fiber and the far- and near-field at fiber output are observed with cameras. The numerical aperture (NA) and mode-conversion or focal-ratio-degradation (FRD) are measured in respect to wavelength at three wavelengths in the VIS region. For the analysis, the patterns are captured at varying exposure times to increase the dynamic range and finally analyzed using image processing methods. Characteristic parameters, such as skew mode propagation and ray-conversion, of circular and non-circular MM-fibers will be discussed, taking the surface roughness into account.
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Arne Wilhelm Zimmer, Arne Wilhelm Zimmer, Philipp Raithel, Philipp Raithel, Mathias Belz, Mathias Belz, Karl-Friedrich Klein, Karl-Friedrich Klein, "Analysis of spectral light guidance in specialty fibers", Proc. SPIE 9886, Micro-Structured and Specialty Optical Fibres IV, 98860Y (27 April 2016); doi: 10.1117/12.2230837; https://doi.org/10.1117/12.2230837

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