Investigation of point defects in silica-based optical fibers by cathodoluminescence
Résumé
We demonstrate the high potential of cathodoluminescence spectroscopy for the study of point defects in the main classes of optical fibers: Telecom-grade, radiation-hardened, and radiation sensitive. Canonical samples that are differently doped in their core (Ge, P, N) or their cladding (F), have been investigated by cathodoluminescence using electrons of energy ranging from 5 to 30 keV. Advantages and limitation of the CL tool are discussed on the basis of the obtained experimental results.