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

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

1,* , 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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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) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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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