Temperature-compensated distributed refractive index sensor based on an etched multi-core fiber in optical frequency domain reflectometry

Zongda Zhu, Dexin Ba, Lu Liu, Liqiang Qiu, Yongkang Dong

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

We proposed a temperature-compensated distributed refractive index (RI) sensor using an etched multi-core fiber (MCF) in optical frequency domain reflectometry. The MCF contains inner and outer cores and is etched until the outer core is exposed. Therefore, the outer core can be used for distributed RI sensing, and the inner core can be used for temperature compensation. The sensing length of 19 cm and the spatial resolution of 5.3 mm are achieved in the experiment. The RI sensing range is as wide as 1.33-1.44 refractive index units (RIU), and the maximum sensitivity of 47 nm/RIU is obtained around 1.44 RIU. Additionally, the temperature sensitivity is 9.8 pm/°C. Using this sensor, we successfully detected the glycerol diffusion process in water.

Original languageEnglish
Pages (from-to)4308-4311
Number of pages4
JournalOptics Letters
Volume46
Issue number17
DOIs
StatePublished - 1 Sep 2021
Externally publishedYes

Bibliographical note

Publisher Copyright:
©2021 Optical Society of America.

Funding

Funding. National Key Scientific Instrument and Equipment Development Projects of China (2017YFF0108700); National Natural Science Foundation of China (61975045); Natural Science Foundation of Heilongjiang Province (LH2020F014).

FundersFunder number
National Natural Science Foundation of China61975045
Natural Science Foundation of Heilongjiang ProvinceLH2020F014
National Key Scientific Instrument and Equipment Development Projects of China2017YFF0108700

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