Towards self-similar propagation in a dispersion tailored and highly nonlinear segmented bandgap fiber at 2.8 micron

TL;DR

This paper demonstrates the numerical design of a specialized fiber that enables self-similar propagation of parabolic pulses at 2.8 microns, achieving significant spectral broadening and stable pulse shaping.

Contribution

It introduces a novel scheme with tailored dispersion and nonlinear profiles in a segmented bandgap fiber for self-similar pulse propagation at mid-infrared wavelengths.

Findings

Achieved self-similar parabolic pulses with 4.12 ps FWHM and ~39 pJ energy.

Reported 38 nm spectral broadening with linear chirp over the pulse.

Designed a segmented fiber with tapered sections for customized dispersion.

Abstract

We numerically demonstrate self-similar propagation of parabolic optical pulses through a highly nonlinear and passive specialty photonic bandgap fiber at 2.8 micron. In this context, we have proposed a scheme endowed with a rapidly varying, but of nearly-mean-zero longitudinal dispersion and modulated nonlinear profile in order to achieve self-similarity of the formed parabolic pulse propagating over longer distances. To implement the proposed scheme, we have designed a segmented bandgap fiber with suitably tapered counterparts to realize such customized dispersion with chalchogenide glass materials. A self-similar parabolic pulse with full-width-at-half-maxima of 4.12 ps and energy of ~ 39 pJ as been achieved at the output. Along with a linear chirp spanning over the entire pulse duration, 3dB spectral broadening of about 38 nm at the output has been reported.