Using the discrete model proposed earlier, the swelling of a fused quartz capillary in a high-temperature (HT) furnace with an arbitrary axial temperature profile is studied by numerical methods. Two regimes of this process are considered—swelling with the capillary stationary in the HT furnace, and swelling as it is stepwise fed into the HT furnace with constant or variable delays per step. The influence of the capillary’s heating time on the kinetics of the swelling process is taken into account. The given model is the theoretical basis for choosing capillary bonding regimes in capillary assemblies—blanks for microstructured optical fibers. The theoretical results for swollen quartz capillaries are experimentally verified for various structures of capillary assemblies; this is important for practical applications.
© 2018 Optical Society of AmericaPDF Article