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Open AccessArticle

Intensity-Modulated PM-PCF Sagnac Loop in a DWDM Setup for Strain Measurement

Telecommunications and Teleinformatics Department, Faculty of Electronics, Wroclaw University of Science and Technology, Wyb. Wyspiańskiego 27, 50-370 Wrocław, Poland
School of Engineering and The Built Environment, Edinburgh Napier University, 10 Colinton Road, Edinburgh EH10 5DT, UK
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(11), 2374;
Received: 9 April 2019 / Revised: 22 May 2019 / Accepted: 1 June 2019 / Published: 11 June 2019
A novel intensity-modulated Sagnac loop sensor based on polarization-maintaining photonic crystal fiber (PM-PCF) in a setup with a dense wavelength division multiplexer (DWDM) for strain measurement is presented. The sensor head is made of PM-PCF spliced to single-mode fibers. The interferometer spectrum shifts in response to the longitudinal strain experienced by the PM-PCF. After passing the Sagnac loop, light is transmitted by a selected DWDM channel, resulting in a change in the output optical power due to the elongation of PM-PCF. Hence, appropriate adjustment of spectral characteristics of the DWDM channel and the PM-PCF Sagnac interferometer is required. However, the proposed setup utilizes an optical power measurement scheme, simultaneously omitting expensive and complex optical spectrum analyzers. An additional feature is the possibility of multiplexing of the PM-PCF Sagnac loop in order to create a fiber optic sensor network. View Full-Text
Keywords: fiber optic sensor; Sagnac loop; intensity-modulated; DWDM; strain sensor fiber optic sensor; Sagnac loop; intensity-modulated; DWDM; strain sensor
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Mądry, M.; Alwis, L.; Bereś-Pawlik, E. Intensity-Modulated PM-PCF Sagnac Loop in a DWDM Setup for Strain Measurement. Appl. Sci. 2019, 9, 2374.

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