Silica-based highly nonlinear fibers (HNLFs) are promising platforms for a wide range of applications utilizing fiber nonlinearities, such as broadband light sources, fiber lasers, amplification, all optical processing, sensors, metrologies, and spectroscopies. The key challenges for their practical applications are tailoring the chromatic dispersion, including higher-order dispersion, as well as high nonlinearity, low fiber attenuation, and low splice loss to standard single mode fibers. This paper outlines our silica-based HNLFs, which are designed specifically for desired applications, featuring HNLF with a longitudinally uniform zero dispersion wavelength and HNLFs with optimized fourth-order dispersion. We also demonstrate an accurate chromatic dispersion measurement and present two types of optical frequency combs that use our silica-based HNLFs as application examples.
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