A diagnostic tool for microbends in fibre termination as a source of FRD

David W. Coutts

doi:10.1117/12.2314194

10 July 2018 A diagnostic tool for microbends in fibre termination as a source of FRD

David W. Coutts

Proceedings Volume 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III; 107066E (2018) https://doi.org/10.1117/12.2314194
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

Microbends in multimode optical fibers are shown to lead to focal ratio degradation which compromises fiber fed spectrograph design and performance. By propagating specific vortex mode patterns through multimode fibers containing a single controlled microbend the mechanisms for FRD can be understood. For example, we see both experimentally and through ray tracing analysis that a microbend can produce spiral patterns in the far-field. These patterns are potentially useful tools for diagnosing termination problems in fiber assemblies. For example, by analyzing the spiral patterns produced by a single microbend it is possible to determine the location of a microbend hidden in the fiber termination.

Citation Download Citation

David W. Coutts "A diagnostic tool for microbends in fibre termination as a source of FRD", Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 107066E (10 July 2018); https://doi.org/10.1117/12.2314194

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