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We report the fabrication and characterization of photonic crystal fibers having a core doped with 10 wt% of phosphorus and a zero dispersion wavelength (ZDW) around 1 μm. These fibers were successfully used for high-power visible continuous wave (CW) supercontinuum generation with an output average power up to 36 W and spectral power densities of 20 mW/nm at 1550 nm and 2 mW/nm at 650 nm. We also show that the spectral power density in the whole region below the pump wavelength significantly increases as the ZDW moves closer to the pump wavelength, at the expense of the short-wavelength edge that slightly redshifts.