Hybrid grating in reduced-diameter fiber for temperature-calibrated high-sensitivity refractive index sensing

Biqiang Jiang*, Zhen Hao, Dingyi Feng, Kaiming Zhou, Lin Zhang, Jianlin Zhao

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

We propose and experimentally demonstrate a hybrid grating, in which an excessively tilted fiber grating (Ex-TFG) and a fiber Bragg grating (FBG) were co-inscribed in a reduced-diameter fiber (RDF). The hybrid grating showed strong resonances due to coupling among core mode and a set of polarization-dependent cladding modes. This coupling showed enhanced evanescent fields by the reduced cladding size, thus allowing stronger interaction with the surrounding medium. Moreover, the FBG's Bragg resonance confined by the thick cladding was exempt from the change of the surrounding medium's refractive index (RI), and then the FBG can work as a temperature compensator. As a result, the Ex-TFG in RDF promised a highly sensitive RI measurement, with a sensitivity up to ~1224 nm/RIU near the RI of 1.38. Through simultaneous measurement of temperature and RI, the temperature dependence of water's RI is then determined. Therefore, the proposed hybrid grating with a spectrum of multi-peaks embedded with a sharp Bragg resonance is a promising alternative for the simultaneous measurement of multi-parameters for many RI-based sensing applications.

Original languageEnglish
Article number1923
JournalApplied Sciences (Switzerland)
Volume9
Issue number9
DOIs
Publication statusPublished - 10 May 2019

Fingerprint

Refractive index
gratings
refractivity
fibers
Fibers
sensitivity
Fiber Bragg gratings
Temperature
Bragg gratings
Evanescent fields
Diffraction gratings
compensators
Polarization
temperature dependence
temperature
Water
polarization
water

Bibliographical note

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Keywords

  • Fiber Bragg grating
  • Refractive index sensing
  • Temperature dependence of the refractive index of water
  • Tilted fiber grating

Cite this

@article{b9ac4e0a723e47cf80c8ce7f65861178,
title = "Hybrid grating in reduced-diameter fiber for temperature-calibrated high-sensitivity refractive index sensing",
abstract = "We propose and experimentally demonstrate a hybrid grating, in which an excessively tilted fiber grating (Ex-TFG) and a fiber Bragg grating (FBG) were co-inscribed in a reduced-diameter fiber (RDF). The hybrid grating showed strong resonances due to coupling among core mode and a set of polarization-dependent cladding modes. This coupling showed enhanced evanescent fields by the reduced cladding size, thus allowing stronger interaction with the surrounding medium. Moreover, the FBG's Bragg resonance confined by the thick cladding was exempt from the change of the surrounding medium's refractive index (RI), and then the FBG can work as a temperature compensator. As a result, the Ex-TFG in RDF promised a highly sensitive RI measurement, with a sensitivity up to ~1224 nm/RIU near the RI of 1.38. Through simultaneous measurement of temperature and RI, the temperature dependence of water's RI is then determined. Therefore, the proposed hybrid grating with a spectrum of multi-peaks embedded with a sharp Bragg resonance is a promising alternative for the simultaneous measurement of multi-parameters for many RI-based sensing applications.",
keywords = "Fiber Bragg grating, Refractive index sensing, Temperature dependence of the refractive index of water, Tilted fiber grating",
author = "Biqiang Jiang and Zhen Hao and Dingyi Feng and Kaiming Zhou and Lin Zhang and Jianlin Zhao",
note = "This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).",
year = "2019",
month = "5",
day = "10",
doi = "10.3390/app9091923",
language = "English",
volume = "9",
journal = "Applied Sciences",
issn = "2076-3417",
publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",
number = "9",

}

Hybrid grating in reduced-diameter fiber for temperature-calibrated high-sensitivity refractive index sensing. / Jiang, Biqiang; Hao, Zhen; Feng, Dingyi; Zhou, Kaiming; Zhang, Lin; Zhao, Jianlin.

In: Applied Sciences (Switzerland), Vol. 9, No. 9, 1923, 10.05.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Hybrid grating in reduced-diameter fiber for temperature-calibrated high-sensitivity refractive index sensing

AU - Jiang, Biqiang

AU - Hao, Zhen

AU - Feng, Dingyi

AU - Zhou, Kaiming

AU - Zhang, Lin

AU - Zhao, Jianlin

N1 - This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

PY - 2019/5/10

Y1 - 2019/5/10

N2 - We propose and experimentally demonstrate a hybrid grating, in which an excessively tilted fiber grating (Ex-TFG) and a fiber Bragg grating (FBG) were co-inscribed in a reduced-diameter fiber (RDF). The hybrid grating showed strong resonances due to coupling among core mode and a set of polarization-dependent cladding modes. This coupling showed enhanced evanescent fields by the reduced cladding size, thus allowing stronger interaction with the surrounding medium. Moreover, the FBG's Bragg resonance confined by the thick cladding was exempt from the change of the surrounding medium's refractive index (RI), and then the FBG can work as a temperature compensator. As a result, the Ex-TFG in RDF promised a highly sensitive RI measurement, with a sensitivity up to ~1224 nm/RIU near the RI of 1.38. Through simultaneous measurement of temperature and RI, the temperature dependence of water's RI is then determined. Therefore, the proposed hybrid grating with a spectrum of multi-peaks embedded with a sharp Bragg resonance is a promising alternative for the simultaneous measurement of multi-parameters for many RI-based sensing applications.

AB - We propose and experimentally demonstrate a hybrid grating, in which an excessively tilted fiber grating (Ex-TFG) and a fiber Bragg grating (FBG) were co-inscribed in a reduced-diameter fiber (RDF). The hybrid grating showed strong resonances due to coupling among core mode and a set of polarization-dependent cladding modes. This coupling showed enhanced evanescent fields by the reduced cladding size, thus allowing stronger interaction with the surrounding medium. Moreover, the FBG's Bragg resonance confined by the thick cladding was exempt from the change of the surrounding medium's refractive index (RI), and then the FBG can work as a temperature compensator. As a result, the Ex-TFG in RDF promised a highly sensitive RI measurement, with a sensitivity up to ~1224 nm/RIU near the RI of 1.38. Through simultaneous measurement of temperature and RI, the temperature dependence of water's RI is then determined. Therefore, the proposed hybrid grating with a spectrum of multi-peaks embedded with a sharp Bragg resonance is a promising alternative for the simultaneous measurement of multi-parameters for many RI-based sensing applications.

KW - Fiber Bragg grating

KW - Refractive index sensing

KW - Temperature dependence of the refractive index of water

KW - Tilted fiber grating

UR - http://www.scopus.com/inward/record.url?scp=85067200987&partnerID=8YFLogxK

U2 - 10.3390/app9091923

DO - 10.3390/app9091923

M3 - Article

AN - SCOPUS:85067200987

VL - 9

JO - Applied Sciences

JF - Applied Sciences

SN - 2076-3417

IS - 9

M1 - 1923

ER -