Fiber-Optic Cavity Ring Down Using an Added-Signal for Curvature Sensing

• Type: Article in International Scientific Journal
• Date: 2015

Authors

Susana Silva (Author) FCUP; Biswas, P (Author) Other; Bandyopadhyay, S (Author) Other; Jorge, PAS (Author) FCUP; marques, mb (Author) FCUP; Frazao, O (Author) FCUP

Journal

Title: IEEE Photonics Technology Letters

Vol. 27

Pages: 2079-2082

ISSN: 1041-1135

Publisher: IEEE

Indexing

ISI Web of Knowledge - 9 Citations

Scopus - 12 Citations

Other information

Authenticus ID: P-00G-NBK

DOI: 10.1109/lpt.2015.2453124

Abstract (EN): This letter presents a fiber-optic cavity ring down (CRD) configuration using an added-signal for curvature sensing. An optical time-domain reflectometer was used to send impulses down into the fiber loop cavity, inside of which a long period grating was placed to act as a sensing device. The added-signal was obtained by the sum of several conventional CRD impulses, thus providing an improvement on the curvature sensitivity when compared with the conventional CRD signal processing. A linear response to applied curvature in the range of 2.2-3.6 m(-1) was observed, and a sensitivity of 15.3 mu s/m(-1) was obtained. This result was found to be 20-fold the one obtained for the conventional CRD signal processing. The added-signal increases the optical power but increases as well the ring-down time due to the sum of the several loops that light travels inside the ring. A ring-down time response of 43.3 mu s was attained (versus 23.7 mu s for the conventional CRD signal processing).

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4