We propose a dispersion-flattened technology for producing broadband and low anomalous dispersion with minimal zero-dispersion wavelengths (ZDWs). This structure can be formed by nanophotonic waveguides using different material combinations. Flat dispersion varying between 0 and 27 ps/nm/km and spanning a range of wavelengths between 1290 and 4570 nm can be achieved. Without applying dispersion hybridization and using complex material combinations, dispersion demonstrates good tolerance to pump wavelength selection and is easier to introduce. Furthermore, the designed structures are applied to generate a supercontinuum over three octaves considering wavelength dependent loss from cladding, which exhibits an excellent bandwidth of − 40 dB even with increasing losses from the waveguide material or structure generation. These findings are useful for supercontinuum generation over multiple octaves in different platforms, which is promising for self-referenced f-2f systems and spectroscopy applications. © 2022 Elsevier Ltd