Fiber Optic Sensors Based on Multicore Structures

Advances in femtosecond laser direct writing of fiber Bragg gratings in multicore fibers: technology, sensor and laser applications

“…See Section Optical sensors based on FBGs in multicore fibers for more details on this topic. Moreover, MCFs can be used as a platform for multiple parameter point sensing 29 . Indeed, localization of the sensing elements in the longitudinal and transverse directions of the MCF allows for simultaneous spatial and spectral densification when measuring temperature, longitudinal stress, and acoustic impact, as it will be discussed in more detail in Subsection Acoustic emission sensor based on a multicore fiber.…”

“…In addition, the independent interrogation of each of the cores allows one to combine at the same point sensors of different types. For example, the bend-insensitive central core can be used for temperature/strain sensing, similar to single-core fibers, and the side cores can contain Fabry-Perot interferometers to measure acoustic impact and the refractive index of the external environment 29 . In Subsection Acoustic emission sensor based on a multicore fiber, we will take a closer look at the MCF-based acoustic sensor using the SDM technique.…”