Refractive Index Interferometer Based On SMF-MMF-TMCF-SMF Structure With Low Temperature Sensitivity

Abstract

An optic fiber refractive index (RI) sensor based on SMF-MMF-TMCF-SMF (SMTmS) structure is proposed. The MMF segment is introduced and confirmed theoretically and experimentally to act as an efficient optical coupler to launch the light from the center core to the cladding. Experimental results demonstrate that SMTmS is highly sensitive (1435.76 nm/RIU) to low surrounding RI in the range of 1.3330–1.3451. The temperature sensing has been implemented and the total wavelength shift of only 1.83 nm is achieved for the range of 30 °C–100 °C, implying a relatively low temperature cross-sensitivity of 2.01 x 10−5 RIU/°C. The developed sensor with high RI sensitivity and low temperature cross-sensitivity could be rather suitable and applicable in the fields of seawater sensing and environmental monitoring.

Department(s)

Electrical and Computer Engineering

Comments

National Key Research and Development Program of China, Grant 2018AAA016

Keywords and Phrases

Multimode fiber; Refractive index sensing; Tapered multicore fiber; Temperature cross-sensitivity

International Standard Serial Number (ISSN)

1068-5200

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2023 Elsevier, All rights reserved.

Publication Date

01 Jul 2020

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