We propose ring photonic crystal fiber (PCF) for supercontinuum generation of optical vortex modes. Due to the large material index contrast between and air holes in the designed ring PCF, there is a two-orders-of-magnitude improvement of the difference between the effective refractive indices of different vortex modes compared with regular ring fiber. The design freedom of PCFs enables a low dispersion ( variation in total) over a 522 nm optical bandwidth. Moreover, the vortex mode has a large nonlinear coefficient of at 1550 nm with a small confinement loss of up to 2000 nm. An octave-spanning supercontinuum spectrum of the vortex mode is generated from 1196 to 2418 nm at by launching a 120 fs pulse with a 60 W peak power at 1710 nm into a 1 cm long ring PCF.
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