Our research deals with studying picosecond pulse propagation from ytterbium laser through the large core multimode
microstructured fibers. Fibers with core sizes from 8 μm to 11 μm were investigated. Pumping in the normal dispersion
regime was made. Supercontinuum (SC) spectra were obtained in all the fiber samples. The main mechanism,
particularly four-wave mixing, responsible for SC generation was investigated theoretically.