Compact Fluorine-Doped Multimode Fiber Sensor for Refractometry in the Visible Spectrum

Silvia Diaz; Abián B. Socorro-Leránoz; Ignacio R. Matías

doi:10.1109/LPT.2025.3616435

Compact Fluorine-Doped Multimode Fiber Sensor for Refractometry in the Visible Spectrum

Silvia Diaz^*
, Abián B. Socorro-Leránoz
, Ignacio R. Matías

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

We present the design and experimental validation of a compact refractive index sensor based on a multimode-fluorine-doped-multimode (MFM) fiber structure. The sensor exploits modal interference effects in the visible spectrum by incorporating a FG105LCA multimode fiber segment with a fluorine-doped cladding. By varying the length and diameter of the central fiber segment, we achieve a significant shift in the attenuation peaks, enabling a high-resolution and compact design. Experimental results demonstrate a maximum sensitivity of 137.07 nm/RIU and a sensitivity of the wavelength shift to the refractive index up to 41.66 nm/RIU. Furthermore, a miniaturized reflective configuration using a 15 mm segment is proposed, offering both performance and integration advantages.

Original language	English
Pages (from-to)	160-163
Number of pages	4
Journal	IEEE Photonics Technology Letters
Volume	38
Issue number	3
DOIs	https://doi.org/10.1109/LPT.2025.3616435
Publication status	Published - 2026
Externally published	Yes

Keywords

Fluorine-doped fiber
multimode fiber
optical fiber sensors

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10.1109/LPT.2025.3616435

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title = "Compact Fluorine-Doped Multimode Fiber Sensor for Refractometry in the Visible Spectrum",

abstract = "We present the design and experimental validation of a compact refractive index sensor based on a multimode-fluorine-doped-multimode (MFM) fiber structure. The sensor exploits modal interference effects in the visible spectrum by incorporating a FG105LCA multimode fiber segment with a fluorine-doped cladding. By varying the length and diameter of the central fiber segment, we achieve a significant shift in the attenuation peaks, enabling a high-resolution and compact design. Experimental results demonstrate a maximum sensitivity of 137.07 nm/RIU and a sensitivity of the wavelength shift to the refractive index up to 41.66 nm/RIU. Furthermore, a miniaturized reflective configuration using a 15 mm segment is proposed, offering both performance and integration advantages.",

keywords = "Fluorine-doped fiber, multimode fiber, optical fiber sensors",

author = "Silvia Diaz and Socorro-Ler{\'a}noz, \{Abi{\'a}n B.\} and Mat{\'i}as, \{Ignacio R.\}",

note = "Publisher Copyright: {\textcopyright} 1989-2012 IEEE.",

year = "2026",

doi = "10.1109/LPT.2025.3616435",

language = "English",

volume = "38",

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journal = "IEEE Photonics Technology Letters",

issn = "1041-1135",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

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T1 - Compact Fluorine-Doped Multimode Fiber Sensor for Refractometry in the Visible Spectrum

AU - Diaz, Silvia

AU - Socorro-Leránoz, Abián B.

AU - Matías, Ignacio R.

PY - 2026

Y1 - 2026

N2 - We present the design and experimental validation of a compact refractive index sensor based on a multimode-fluorine-doped-multimode (MFM) fiber structure. The sensor exploits modal interference effects in the visible spectrum by incorporating a FG105LCA multimode fiber segment with a fluorine-doped cladding. By varying the length and diameter of the central fiber segment, we achieve a significant shift in the attenuation peaks, enabling a high-resolution and compact design. Experimental results demonstrate a maximum sensitivity of 137.07 nm/RIU and a sensitivity of the wavelength shift to the refractive index up to 41.66 nm/RIU. Furthermore, a miniaturized reflective configuration using a 15 mm segment is proposed, offering both performance and integration advantages.

AB - We present the design and experimental validation of a compact refractive index sensor based on a multimode-fluorine-doped-multimode (MFM) fiber structure. The sensor exploits modal interference effects in the visible spectrum by incorporating a FG105LCA multimode fiber segment with a fluorine-doped cladding. By varying the length and diameter of the central fiber segment, we achieve a significant shift in the attenuation peaks, enabling a high-resolution and compact design. Experimental results demonstrate a maximum sensitivity of 137.07 nm/RIU and a sensitivity of the wavelength shift to the refractive index up to 41.66 nm/RIU. Furthermore, a miniaturized reflective configuration using a 15 mm segment is proposed, offering both performance and integration advantages.

KW - Fluorine-doped fiber

KW - multimode fiber

KW - optical fiber sensors

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DO - 10.1109/LPT.2025.3616435

M3 - Article

AN - SCOPUS:105018108651

SN - 1041-1135

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SP - 160

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JO - IEEE Photonics Technology Letters

JF - IEEE Photonics Technology Letters

IS - 3

ER -

Compact Fluorine-Doped Multimode Fiber Sensor for Refractometry in the Visible Spectrum

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Keywords

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