4.5 Article

Femtosecond Laser Line-by-Line Inscribed Seven Core Fiber Cascaded Fabry-Perot Cavity and Its Vectorial Bending Sensing Application

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PHOTONICS
卷 10, 期 6, 页码 -

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MDPI
DOI: 10.3390/photonics10060605

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femtosecond laser; Fabry-Perot (F-P); vector bending; SCF

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Multi-core fibers are widely used for vector-bending sensing. Compared to Bragg grating-based sensors, fiber Fabry-Perot (F-P) interferometers have advantages in fabrication and potential for improved sensitivity. We propose and demonstrate a cascaded F-P cavity vector bending sensor, which shows strong bending dependence and can reconstruct the curvature magnitude and direction from the tilted wavelength shift of the asymmetric fiber-core F-P cavities.
Multi-core fibers have been widely used for vector-bending sensing due to their off-axis distributed cores. In contrast to vector-bending sensors based on Bragg gratings, fiber Fabry-Perot (F-P) interferometers are more advantageous due to their ease of fabrication and potential for introducing the Vernier effect to further improve sensitivity. We propose and experimentally demonstrate a cascaded Fabry-Perot (F-P) cavity vector bending sensor. From the experimental results, the sensor has a strong bending dependence with a maximum sensitivity of 123.12 pm/m(-1), and the curvature magnitude and direction can be reconstructed from the tilted wavelength shift of the asymmetric fiber-core F-P cavities.

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