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Enhanced refractometer based on periodically tapered small core singlemode fiber

Enhanced refractometer based on periodically tapered small core singlemode fiber
Enhanced refractometer based on periodically tapered small core singlemode fiber
An all-fiber refractive index (RI) sensor with a simple configuration of periodical tapers is proposed and investigated experimentally. The proposed fiber RI sensor consists of a small core fiber sandwiched between two standard singlemode fibers, with tapers periodically fabricated along the small core fiber using a focused CO2 laser beam. Such a structure can be used for RI sensing by measuring the dip wavelength shift of the multimode interference within the small core fiber cladding. An average sensitivity of 226.6 nm/RIU (RI Unit) has been experimentally achieved in the RI range from 1.33 to 1.38. The refractometer is sensitive to temperature and an experimental investigation of this sensitivity is presented. It is found that the peak shift response has a linear variation with temperature; therefore, temperature dependence can be mitigated by a suitable RI correction process. The proposed RI sensor benefits from simplicity and low cost and achieves a competitive sensitivity compared with other existing fiber-optic sensors.
1530-437X
180-185
Wang, Pengfei
a1ba240f-d4f0-4150-bcd8-cb418e841dcb
Brambilla, Gilberto
815d9712-62c7-47d1-8860-9451a363a6c8
Ding, Ming
086b25a3-e5c3-4501-a90d-43d734e19344
Lee, Timothy
beb3b88e-3e5a-4c3f-8636-bb6de8040fcc
Bo, Lin
cffc25e8-2256-4f08-ada8-a1386c326810
Semenova, Yuliya
6e64157c-40b6-4eb5-938c-ae2dd348f652
Wu, Qiang
fad3844e-9eba-496c-876d-3bbc9ee4a689
Farrell, Gerald
6c4b8f27-d88c-41a2-87ff-f2466225798f
Wang, Pengfei
a1ba240f-d4f0-4150-bcd8-cb418e841dcb
Brambilla, Gilberto
815d9712-62c7-47d1-8860-9451a363a6c8
Ding, Ming
086b25a3-e5c3-4501-a90d-43d734e19344
Lee, Timothy
beb3b88e-3e5a-4c3f-8636-bb6de8040fcc
Bo, Lin
cffc25e8-2256-4f08-ada8-a1386c326810
Semenova, Yuliya
6e64157c-40b6-4eb5-938c-ae2dd348f652
Wu, Qiang
fad3844e-9eba-496c-876d-3bbc9ee4a689
Farrell, Gerald
6c4b8f27-d88c-41a2-87ff-f2466225798f

Wang, Pengfei, Brambilla, Gilberto, Ding, Ming, Lee, Timothy, Bo, Lin, Semenova, Yuliya, Wu, Qiang and Farrell, Gerald (2013) Enhanced refractometer based on periodically tapered small core singlemode fiber. IEEE Sensors Journal, 13 (1), 180-185. (doi:10.1109/JSEN.2012.2216865).

Record type: Article

Abstract

An all-fiber refractive index (RI) sensor with a simple configuration of periodical tapers is proposed and investigated experimentally. The proposed fiber RI sensor consists of a small core fiber sandwiched between two standard singlemode fibers, with tapers periodically fabricated along the small core fiber using a focused CO2 laser beam. Such a structure can be used for RI sensing by measuring the dip wavelength shift of the multimode interference within the small core fiber cladding. An average sensitivity of 226.6 nm/RIU (RI Unit) has been experimentally achieved in the RI range from 1.33 to 1.38. The refractometer is sensitive to temperature and an experimental investigation of this sensitivity is presented. It is found that the peak shift response has a linear variation with temperature; therefore, temperature dependence can be mitigated by a suitable RI correction process. The proposed RI sensor benefits from simplicity and low cost and achieves a competitive sensitivity compared with other existing fiber-optic sensors.

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More information

Published date: 2013
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 350040
URI: http://eprints.soton.ac.uk/id/eprint/350040
ISSN: 1530-437X
PURE UUID: 338e4c94-b0f3-4d81-9f5a-4ad83b68f714

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Date deposited: 15 Mar 2013 14:25
Last modified: 16 Jul 2019 21:40

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