Optical Vernier Effect in Fabry-Perot Interferometers Based on Ultra-Short Fiber Bragg Gratings

• Type: Article in International Scientific Journal
• Date: 2024

Authors

Pereira, L (Author) Other; Humberto Varum (Author) FEUP; Antunes, P (Author) Other

Journal

Title: IEEE Photonics Technology Letters

Vol. 36

Pages: 254-257

ISSN: 1041-1135

Publisher: IEEE

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 1 Citation

Other information

Authenticus ID: P-010-76C

DOI: 10.1109/lpt.2024.3350349

Abstract (EN): The optical Vernier effect (OVE) generated by optical fiber Fabry-Perot interferometers (FPIs) has gain emphasis for sensing applications due to the high sensitivities and resolutions these devices can achieve. Here, we experimentally demonstrate the production of cascaded intrinsic FPIs with amplified sensitivity by the OVE, using ultra-short fiber Bragg gratings (USFBGs) inscribed with a Nd:YAG laser system. This method is an alternative solution with great versatility and repeatability, which can improve the production and dissemination of devices with enhanced sensitivity. Three sensing devices are proposed, and their viability is demonstrated, where different magnification factors and operation bandwidths are presented. Strain and temperature tests were performed to the proposed sensors, demonstrating sensitivity magnifications of about 25 and 42 when compared with a single USFBG-based FPI. These sensors have great potential in terms of production and sensing applications, by allying the main advantages of the FBG technology with the OVE.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4