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

Sensors

Harith Ahmad¹  Mohd Zamani Zulkifli¹  Farah Diana Muhammad¹  Julian Md Samangun¹  Hairul Azhar Abdul-Rashid² 

[1] Photonics Research Centre, University of Malaya, 50603 Kuala Lumpur, Malaysia; E-Mails:;Faculty of Engineering, Multimedia University, 63100 Cyberjaya, Selangor, Malaysia; E-Mail:

关键词: bending sensor;    special fiber;    temperature-insensitivity;    erbium-doped fiber;   

DOI  :  10.3390/s130709536

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.