Fiber Loop Mirror Sensors Interrogated and Multiplexed by OTDR

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

Authors

Miranda Rocco Giraldi, MTMR (Author) Other; Fernandes, CS (Author) Other; Ferreira, MS (Author) Other; de Sousa, MJ (Author) Other; Jorge, PAS (Author) FCUP; Weyl Albuquerque Costa, JCWA (Author) Other; Santos, JL (Author) FCUP; Frazao, O (Author) FCUP

Journal

Title: Journal of Lightwave Technology

Vol. 33

Pages: 2580-2584

ISSN: 0733-8724

Publisher: Optical Society of America

Indexing

ISI Web of Knowledge - 5 Citations

Scopus - 7 Citations

Other information

Authenticus ID: P-00G-C5N

DOI: 10.1109/jlt.2014.2360500

Abstract (EN): In this paper, two techniques for interrogation and multiplexing of fiber loop mirror (FLM) intensity sensors based on optical time domain reflectometer (OTDR) are proposed. These configurations enable series and parallel FLM sensor interrogation. A fiber taper characterized as a displacement sensor was used as the intensity sensor. The OTDR parameters were optimized in order to obtain the best results. The optimized parameters were 100-ns pulse width and 10-dB input signal attenuation which permitted to attain similar to 18 dB dynamic range in the operating wavelength of 1550 nm. The results show a linear behavior for both configurations with similar slope, -15.3 dB/mm, in the normalized displacement range of 0.2 to 0.7 mm. It was also achieved a displacement resolution of 0.027 and 0.093 mm, for the series and parallel configurations, respectively. Sensors multiplexing are demonstrated for both configurations and the systems do not present crosstalk. Based on the experimental results, the best configuration is the parallel one. The proposed approach is a viable alternative for multiplexing and interrogation of remote fiber sensors.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5