23 April 2017 Effective light coupling in reflective fiber optic distance sensors using a double-clad fiber
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Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 1032391 (2017) https://doi.org/10.1117/12.2267478
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of
Abstract
Many fiber optic distance sensors use a reflective configuration, where a light beam is launched from an optical fiber, reflected from a target and coupled back into the fiber. While singlemode fibers (SMF) provide low-loss, high-performance components and a well-defined output beam, the coupling of the reflected light into the SMF is very sensitive to mechanical misalignments and scattering at the reflecting target. In this paper we use a double-clad fiber (DCF) and a DCF coupler to obtain an enhanced multimodal coupling of reflected light into the fiber. Increased power levels and robustness are achieved compared to a pure SMF configuration.
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Stefan Werzinger, Lisa Härteis, Aaron Köhler, Rainer Engelbrecht, Bernhard Schmauss, "Effective light coupling in reflective fiber optic distance sensors using a double-clad fiber", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 1032391 (23 April 2017); doi: 10.1117/12.2267478; https://doi.org/10.1117/12.2267478
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