Fiber-taper seeded long-period grating pair as a highly sensitive refractive-index sensor

Author

Ding, Jin-Fei ; Zhang, A. Ping ; Shao, Li-Yang ; Yan, Jin-Hua ; He, Sailing

Author_Institution

Dept. of Opt. Eng., Zhejiang Univ., China

Volume

17

Issue

6

fYear

2005

fDate

6/1/2005 12:00:00 AM

Firstpage

1247

Lastpage

1249

Abstract

We report the fabrication and characterization of a highly sensitive refractive-index sensor based on a long-period grating (LPG) pair with a fiber-taper section in between. Two LPGs with ∼3-dB transmissivity form an in-fiber Mach-Zehnder interferometer. A fiber taper is made between the two LPGs to improve and tailor the sensitivity of the sensor. Enhanced sensitivity, which is about five times higher than that of a normal LPG pair, is achieved in the experiment.

Keywords

Bragg gratings; Mach-Zehnder interferometers; fibre optic sensors; optical fibre fabrication; refractive index measurement; fiber-taper seeded long-period grating pair; in-fiber Mach-Zehnder interferometer; refractive-index sensor; transmissivity; Biosensors; Bragg gratings; Chemical and biological sensors; Fiber gratings; Optical fiber sensors; Optical interferometry; Optical refraction; Optical sensors; Optical surface waves; Sensor phenomena and characterization; Fiber taper; long-period fiber gratings; optical fiber sensor; refractive-index (RI) measurement;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2005.847437

Filename

1432791