Beyond Two-Octave Coherent OAM Supercontinuum Generation in Air-Core As2S3 Ring Fiber

Yingning Wang, Yuxi Fang, Wenpu Geng, Jicong Jiang, Zhi Wang, Hao Zhang, Changjing Bao, Hao Huang, Yongxiong Ren, Zhongqi Pan, Yang Yue
2020 IEEE Access  
In this work, we designed and simulated a novel air-core As 2 S 3 ring fiber that supports orbital angular momentum (OAM) modes. By optimizing the structure parameters of the designed fiber to effectively tailor its chromatic dispersion, a near-zero flat dispersion profile with a total of < ±30 ps/nm/km variation over 3380-nm bandwidth from 2025 nm to 5405 nm is achieved for OAM 1,1 mode. After launching a 100-fs 70-kW hyperbolic secant pulse into an 8-mm air-core As 2 S 3 ring fiber, a
more » ... rrying OAM supercontinuum is numerically formed beyond two-octave range, covering 5717nm bandwidth from 1182 nm to 6897 nm at -30dB. Furthermore, the generated supercontinuum is highly coherent across the whole spectral range. This can serve as an effective manner to expand the spectral coverage of the OAM beams for various applications. INDEX TERMS Supercontinuum generation, optical vortex, nonlinear optics, ring fiber.
doi:10.1109/access.2020.2996666 fatcat:bu5nerwdcrfljgfgowiwu7a6da