In this paper, we reviewed the scientific investigations of ultra-wideband supercontinuum (SC) generation with optical fibers. Thanks to the invention of photonic crystal fibers and highly nonlinear fibers, octave spanning supercontinuum can be generated with sub-nJ level ultrashort pulse pumping. Nowadays, we can generate coherent, low noise SC, which is useful for optical frequency comb, highresolution optical coherence tomography, etc. Historical background, generation mechanism, their applications, recent progress, and future prospects were briefly discussed.