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Journal of Sensors
Volume 2015, Article ID 726793, 6 pages
Research Article

Fiber-Optic Bend Sensor Based on Double Cladding Fiber

1Ulyanovsk Branch of Kotel’nikov Institute of Radio Engineering and Electronics of Russian Academy of Sciences, Ulitsa Goncharova 48, Ulyanovsk 432011, Russia
2Ulyanovsk State University, Ulitsa L. Tolstogo 42, Ulyanovsk 432017, Russia
3Ulyanovsk State Technical University, Severny Venetz Street 32, Ulyanovsk 432027, Russia

Received 31 March 2015; Revised 18 June 2015; Accepted 24 June 2015

Academic Editor: Christos Riziotis

Copyright © 2015 Oleg V. Ivanov and Alexey A. Chertoriyskiy. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We develop and investigate fiber-optic bend sensor, which is formed by a section of double cladding SM630 fiber between standard SMF-28 fibers. The principle of operation of the sensor is based on coupling of the fiber core and cladding modes at the splices of fibers having different refractive index profiles. We use two sources with wavelengths 1328 and 1545 nm to interrogate the sensor. The dependences of transmission on curvature at these wavelengths are significantly different. We show that the proposed sensor is able to perform measurements of curvature with radii from meters to 26 cm with accuracy of about 3%.