Polarization angle sensing via tubular hollow-core fibers
Hollow-core fibers; Polarization sensing; sensors; fiber optics
In the field of optical fibers, hollow-core photonic crystal fibers (HCPCFs) have emerged as a versatile platform for light guidance, allowing precise control of optical properties through the modification of their microstructure. By strategically modifying the fiber's microstructure, such as altering the symmetry of the cladding tubes, it is possible to precisely tailor its modal properties. This geometric manipulation allows for controlling the modal loss hierarchy, favoring the simultaneous propagation and interference of specific optical modes. These engineered modal interference can generate unique spatial intensity distributions that are highly sensitive to external parameters. Therefore, this work aims to propose and experimentally characterize a polarization rotation angle sensor based on modal superposition in a tubular HCPCF with modified symmetry.