Intensity-modulated PM-PCF Sagnac loop in a DWDM setup for strain measurement

Alwis, Lourdes; Madry, Mateusz; Beres-Pawlik, Elizbieta

Abstract

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.

Citation

Alwis, L., Madry, M., & Beres-Pawlik, E. (2019). Intensity-modulated PM-PCF Sagnac loop in a DWDM setup for strain measurement. Applied Sciences, 9(11), https://doi.org/10.3390/app9112374

• Journal Article Type: Article
• Acceptance Date: Jun 1, 2019
• Online Publication Date: Jun 11, 2019
• Publication Date: Jun 11, 2019
• Deposit Date: Jun 20, 2019
• Publicly Available Date: Jun 20, 2019
• Journal: Applied Sciences
• Electronic ISSN: 2076-3417
• Publisher: MDPI
• Peer Reviewed: Peer Reviewed
• Volume: 9
• Issue: 11
• DOI: https://doi.org/10.3390/app9112374
• Keywords: Fiber optic sensor; Sagnac loop; intensity-modulated; DWDM; strain sensor
• Public URL: http://researchrepository.napier.ac.uk/Output/1891042