%0 Journal Article
%T Temperature-Insensitive Bend Sensor Using Entirely Centered Erbium Doping in the Fiber Core
%A Harith Ahmad
%A Mohd Zamani Zulkifli
%A Farah Diana Muhammad
%A Julian Md Samangun
%A Hairul Azhar Abdul-Rashid
%A Sulaiman Wadi Harun
%J Sensors
%D 2013
%I MDPI AG
%R 10.3390/s130709536
%X 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 ¦Ìm encompassing a doped, inner core region with a diameter of 4.00 ¦Ìm. The doped core region has about 400 ppm of an Er 2O 3 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/¡ãC, thus allowing for the development of a highly stable sensor system based in the change of the peak power alone.
%K bending sensor
%K special fiber
%K temperature-insensitivity
%K erbium-doped fiber
%U http://www.mdpi.com/1424-8220/13/7/9536