Abstract
In this work, we design and simulate an air-core As 2 S 3 ring fiber for high-order orbital angular momentum (OAM) supercontinuum generation. We show that the chromatic dispersion of the ring fiber can be substantially tailored by proper optimization of the air-core radius. Two-octave supercontinuum carrying OAM 17,1 mode, spanning from 1560 to 6250 nm, is obtained by pumping a 50-fs 100-kW secant hyperbolic pulse centered at the wavelength of 3800 nm into the designed fiber with 50-μm air-core radius and 1-μm ring width. We further engineer the chromatic dispersion of some other OAM modes and perform simulations of supercontinuum spectra using different kilowatt-level peak power, which indicates that the fiber we design represents a promising avenue for supercontinuum generation of all the OAM l,1 modes (|l| ≤17). The proposed fiber is suitable for the transmission of OAM beams in infrared wavelength range and it could promote the development and application of high-order OAM beams.
Highlights
Orbital angular momentum (OAM) beams with the helical phase pattern have gained tremendous interest in recent years
We propose an air-core As2S3 ring fiber, which could support SC generation for high-order orbital angular momentum (OAM) modes up to |l| = 17
The proposed fiber is suitable for the transmission of vector beams in 2000 - 6000 nm wavelength range and it could promote the development of high-order OAM beam applications in the mid-infrared waveband region
Summary
Orbital angular momentum (OAM) beams with the helical phase pattern have gained tremendous interest in recent years. Y. Wang et al.: Two-Octave SC Generation of High-Order OAM Modes in Air-Core As2S3 Ring Fiber capacity though mode division multiplexing (MDM) in an all-fiber optical communication system. One of the critical barriers is that higher-order OAM modes, which have more azimuthal phase periods in their transverse field distribution, feature faster variation and stronger dependence to the wavelength [19]. This makes it difficult to achieve flat and smooth chromatic dispersion for SC generation over wide wavelength range. The proposed fiber is suitable for the transmission of vector beams in 2000 - 6000 nm wavelength range and it could promote the development of high-order OAM beam applications in the mid-infrared waveband region
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