Over-Two-Octave Supercontinuum Generation of Light-Carrying Orbital Angular Momentum in Germania-Doped Ring-Core Fiber

In this paper, we design a silica-cladded Germania-doped ring-core fiber (RCF) that supports orbital angular momentum (OAM) modes. By optimizing the fiber structure parameters, the RCF possesses a near-zero flat dispersion with a total variation of <+/- 30 ps/nm/km over 1770 nm bandwidth from 1040 to 2810 nm for the OAM(1,1) mode. A beyond-two-octave supercontinuum spectrum of the OAM(1,1) mode is generated numerically by launching a 40 fs 120 kW pulse train centered at 1400 nm into a 12 cm long designed 50 mol% Ge-doped fiber, which covers 2130 nm bandwidth from 630 nm to 2760 nm at -40 dB of power level. This design can serve as an efficient way to extend the spectral coverage of beams carrying OAM modes for various applications.

Automated summary

In this paper, a silica-cladded Germania-doped ring-core fiber (RCF) that supports orbital angular momentum (OAM) modes is designed. By optimizing the fiber structure parameters, the RCF achieves near-zero flat dispersion. This design serves as an efficient way to extend the spectral coverage of beams carrying OAM modes for various applications.