A common issue in fiber-based supercontinuum (SC) generation under\udcontinuous-wave pumping is that the spectral width of the resulting source is related\udto the input power of the pump laser used. An increase of the input pump power\udleads to an increase of the spectral width obtained at the fiber output, and therefore,\udthe average power spectral density (APSD) over the SC spectrum does not grow\udaccording to the input power. For some applications it would be desired to have a\udfixed spectral width in the SC and to increase the average PSD proportionally to the\udinput pump power. In this paper we demonstrate experimentally that SC generation\udunder continuous-wave (CW) pumping can be spectrally bounded by using a fiber\udwith two zero-dispersion wavelengths (ZDWs). Beyond a certain pump power, the\udspectral width of the SC source remains fixed, and the APSD of the SC grows with\udthe pump power. In our experiment we generate a reasonably flat, spectrally-bounded\udSC spanning from 1550 nm to 1700 nm. The spectral width of the source is shown to\udbe constant between 3 and 6 W of pump power. Over this range, the increase in input\udpower is directly translated in an increase in the output APSD. The experimental\udresults are confirmed by numerical simulations, which also highlight the sensitivity\udof this configuration to variations in the fiber dispersion curve. We believe that these\udresults open the way for tailoring the spectral width of high-APSD CW SC by\udadjusting the fiber dispersion.
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