Small-angle X-ray scattering analysis of polymer optical fibers

Optical fiber communication networks, lasers, and sensing technologies have advanced significantly worldwide. Beyond traditional glass fibers, polymer optical fibers (POFs) are gaining attention for short-distance communication and healthcare applications. These fibers offer advantages such as lightweight construction and high durability but face challenges including crystallization and contamination during the drawing process. Advanced techniques are necessary to characterize POFs at the nanoscale. This study employs small-angle X-ray scattering (SAXS) to analyze fiber structure, anisotropy, and crystallinity, providing valuable insights into their material properties. Our findings introduce a novel approach to POF characterization, with potential integration into drawing towers for real-time quality control and applications in studying laser-induced damage. • Developed SAXS methods for polymer optical fiber (POF) nanoscale analysis. • Quantified fiber anisotropy and crystallinity using SAXS spectra fitting. • Monitored crystallinity changes during thermal cycles in situ. • Identified X-ray refraction artifacts affecting SAXS analysis of small fibers. • Proposed SAXS integration into real-time POF fabrication quality control.