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Sensors 2013, 13(7), 9536-9546; doi:10.3390/s130709536
Article

Temperature-Insensitive Bend Sensor Using Entirely Centered Erbium Doping in the Fiber Core

1,* , 1
,
1
,
1
,
2
 and
1
1 Photonics Research Centre, University of Malaya, 50603 Kuala Lumpur, Malaysia 2 Faculty of Engineering, Multimedia University, 63100 Cyberjaya, Selangor, Malaysia
* Author to whom correspondence should be addressed.
Received: 3 June 2013 / Revised: 15 July 2013 / Accepted: 17 July 2013 / Published: 23 July 2013
(This article belongs to the Special Issue Optomechatronics)
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Abstract

A fiber based bend sensor using a uniquely designed Bend-Sensitive Erbium Doped Fiber (BSEDF) is proposed and demonstrated. The BSEDF has two core regions, namely an undoped outer region with a diameter of about 9.38 μm encompassing a doped, inner core region with a diameter of 4.00 μm. The doped core region has about 400 ppm of an Er2O3 dopant. Pumping the BSEDF with a conventional 980 nm laser diode gives an Amplified Spontaneous Emission (ASE) spectrum spanning from 1,510 nm to over 1,560 nm at the output power level of about −58 dBm. The ASE spectrum has a peak power of −52 dBm at a central wavelength of 1,533 nm when not spooled. Spooling the BSEDF with diameters of 10 cm to 2 cm yields decreasing peak powers from −57.0 dBm to −61.8 dBm, while the central wavelength remains unchanged. The output is highly stable over time, with a low temperature sensitivity of around ~0.005 dBm/°C, thus allowing for the development of a highly stable sensor system based in the change of the peak power alone.
Keywords: bending sensor; special fiber; temperature-insensitivity; erbium-doped fiber bending sensor; special fiber; temperature-insensitivity; erbium-doped fiber
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Ahmad, H.; Zulkifli, M.Z.; Muhammad, F.D.; Samangun, J.M.; Abdul-Rashid, H.A.; Harun, S.W. Temperature-Insensitive Bend Sensor Using Entirely Centered Erbium Doping in the Fiber Core. Sensors 2013, 13, 9536-9546.

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