Influence of initial frequency chirp on the supercontinuum generation in As2S3 chalcogenide fiber

Abstract

Initial frequency chirp has significant influence on spectral evolution when the pulse propagates along the fiber. We report on the numerical results of supercontinuum (SC) generation in As2S3 chalcogenide fiber that positive initial chirp is beneficial for spectral broadening, while the negative chirp does the opposite. Besides, when the initial frequency chirp is lower than 30, the SC bandwidth increases with initial frequency chirp. The maximum SC bandwidth is ~2800 nm, which spans from near infrared (IR) to mid-IR region.