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.
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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.
Ahmad H, Zulkifli MZ, Muhammad FD, Samangun JM, Abdul-Rashid HA, Harun SW. Temperature-Insensitive Bend Sensor Using Entirely Centered Erbium Doping in the Fiber Core. Sensors. 2013; 13(7):9536-9546.
Ahmad, Harith; Zulkifli, Mohd Z.; Muhammad, Farah D.; Samangun, Julian M.; Abdul-Rashid, Hairul A.; Harun, Sulaiman W. 2013. "Temperature-Insensitive Bend Sensor Using Entirely Centered Erbium Doping in the Fiber Core." Sensors 13, no. 7: 9536-9546.