Temperature independent refractive index measurement using a fiber Bragg grating on abrupt tapered tip

被引：14

作者：

Gomes, Andre D. ^{[1
,2
,3
]}

Silveira, Beatriz ^{[1
,2
]}

Warren-Smith, Stephen C. ^{[3
,4
,5
,6
]}

Becker, Martin ^{[3
]}

Rothhardt, Manfred ^{[3
]}

Frazao, Orlando ^{[1
,2
]}

机构：

[1] Univ Porto, Fac Sci, INESC TEC, Rua Campo Alegre 687, P-4169007 Oporto, Portugal

[2] Univ Porto, Fac Sci, Dept Phys & Astron, Rua Campo Alegre 687, P-4169007 Oporto, Portugal

[3] Leibniz Inst Photon Technol IPHT, Albert Einstein Str 9, D-07745 Jena, Germany

[4] Univ Adelaide, IPAS, Adelaide, SA 5005, Australia

[5] Univ Adelaide, ARC Ctr Excellence Nanoscale BioPhoton CNBP, Adelaide, SA 5005, Australia

[6] Univ Adelaide, Sch Phys Sci, Adelaide, SA 5005, Australia

来源：

OPTICS AND LASER TECHNOLOGY | 2018年 / 101卷

关键词：

Optical fiber sensors; Fiber Bragg grating; Abrupt taper tip; Refractive index sensing; Temperature independent measurements; MICROSTRUCTURED OPTICAL-FIBER; TILTED FIBER; REFRACTOMETER; SENSITIVITY; PRESSURE; SENSORS;

D O I：

10.1016/j.optlastec.2017.11.031

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A fiber Bragg grating was inscribed in an abrupt fiber taper using a femtosecond laser and phase-mask interferometer. The abrupt taper transition allows to excite a broad range of guided modes with different effective refractive indices that are reflected at different wavelengths according to Bragg's law. The multimode-Bragg reflection expands over 30 nm in the telecom-C-band. This corresponds to a mode field overlap of up to 30% outside of the fiber, making the device suitable for evanescent field sensing. Refractive index and temperature measurements are performed for different reflection peaks. Temperature independent refractive index measurements are achieved by considering the difference between the wavelength shifts of two measured reflection peaks. A minimum refractive index sensitivity of 16 +/- 1 nm/RlU was obtained in a low refractive index regime (1.3475-1.3720) with low influence of temperature (-0.32 0.06 pm/degrees C). The cross sensitivity for this structure is 2.0 x 10(-5) RlU/degrees C.. The potential for simultaneous measurement of refractive index and temperature is also studied. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：227 / 231

页数：5

共 22 条

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