Low Zero-Dispersion-Wavelength All-Solid Anti-Resonant Fiber for Deep Ultraviolet Supercontinuum Generation

Effective dispersion control, especially for low zero-dispersion wavelength (ZDW) and flat dispersion, is crucial for generating supercontinuum (SC) spectra that extend into the deep ultraviolet (UV). This paper proposes and numerically investigates a low ZDW all-solid anti-resonant fiber (AAF) for deep UV SC generation. The optical fiber transmission characteristics are analyzed by the full-vector finite element method, and the evolution of the pumping light into SC is numerically simulated through the nonlinear Schrödinger equation solved by the split-step Fourier method. The results of the numerical analysis show that the AAF structure has a minimum ZDW of 196 nm and dispersion slopes ranging from - 1.35 to 0.20 ps·nm -2 ·km -1 . When the AAF is pumped in the anomalous dispersion region with 15 ps input pulses of 0.5 MW peak power, the SC spectrum has a spectral width extending from 210 nm to 1140 nm. These results demonstrate AAF has strong potential in dispersion control and generating broad-spectrum UV SC.