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Characteristics of cladding mode-based refractive index sensor using MMF-SMF-MMF configuration

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Abstract

We report our analytical description to predict and interpret the observed light transmission characteristics through a system of concatenated dissimilar optical fibers having core diameter mismatch while devising cladding mode-based refractive-index sensing devices. The configuration consists of a pair of identical multimode fibers (MMFs) in which a short segment of conventional single-mode fiber (SMF) is spliced as a sensing zone. Because of the core diameter mismatch, the cladding of the SMF guides light and makes the device sensitive to external perturbation/change in refractive index of the surrounding medium. The device can operate at different wavelengths, which makes it attractive for diverse applications. Using our analysis, we evaluate the performance of a few configurations of the sensor and compare the results with those obtained experimentally or known otherwise. We demonstrate that our model is general and can be applied to devise sensor with any transverse profile MMF to explore new applications.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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  1. Department of Physics, Indian Institute of Technology, Kharagpur, India

    Protik Roy & Partha Roy Chaudhuri

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  1. Protik Roy
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Correspondence to Partha Roy Chaudhuri.

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Roy, P., Roy Chaudhuri, P. Characteristics of cladding mode-based refractive index sensor using MMF-SMF-MMF configuration. J Opt 52, 296–306 (2023). https://doi.org/10.1007/s12596-022-00885-1

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