Nonadiabatically Tapered Microfiber Sensor With Ultrashort Waist

Author

Wen Bin Ji ; Yung Chuen Tan ; Bo Lin ; Swee Chuan Tjin ; Kin Kee Chow

Author_Institution

Dept. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore

Volume

26

Issue

22

fYear

2014

fDate

Nov.15, 15 2014

Firstpage

2303

Lastpage

2306

Abstract

We investigated a nonadiabatically tapered microfiber refractive index sensor with an ultrashort waist length. Free spectral range (FSR) is one common issue in the interferometry-based sensors. Such sensors will not work properly once the resonant wavelengths shift over one cycle. It was found that the temperature and pulling speed are the crucial parameters to achieve a desired tapering profile. By setting a cooler tapering temperature and fast pulling speed, we successfully fabricated ultrashort microfibers with a waist length of only 2.4 mm and total length of 5.5 mm. The resulting FSR is ~80 nm and the maximum sensitivity achieved for such short microfiber is 25 667 nm/RIU.

Keywords

fibre optic sensors; light interferometry; micro-optics; microsensors; optical fibre fabrication; refractive index; FSR; free spectral range; interferometry-based sensors; maximum sensitivity; nonadiabatically tapered microfiber refractive index sensor; pulling speed; resonant wavelengths; size 2.4 mm; size 5.5 mm; tapering profile; tapering temperature; ultrashort microfiber fabrication; ultrashort waist length; Fabrication; Optical fiber sensors; Optical fibers; Optical interferometry; Optimized production technology; Refractive index; Sensitivity; Optical fiber; microfiber; non-adiabatic; short taper;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2014.2353931

Filename

6891196