Pulse quality analysis on soliton pulse compression and soliton self-frequency shift in a hollow-core photonic bandgap fiber

N González-Baquedano,A Ferrando,D E Ceballos-Herrera,N Arzate,I Torres-Gómez

doi:10.1364/oe.21.009132

Abstract

A numerical investigation of low-order soliton evolution in a proposed seven-cell hollow-core photonic bandgap fiber is reported. In the numerical simulation, we analyze the pulse quality evolution in soliton pulse compression and soliton self-frequency shift in three fiber structures with different cross-section sizes. In the simulation, we consider unchirped soliton pulses (of 400 fs) at the wavelength of 1060 nm. Our numerical results show that the seven-cell hollow-core photonic crystal fiber, with a cross-section size reduction of 2%, promotes the pulse quality on the soliton pulse compression and soliton self-frequency shift. For an input soliton pulse of order 3 (which corresponds to an energy of 1.69 μJ), the pulse gets compressed with a factor of up to 5.5 and a quality factor of 0.73, in a distance of 12 cm. It also experiences a soliton-self frequency shift of up to 28 nm, in a propagation length of 6 m, with a pulse shape quality of ≈ 0.80.

Highlights

Nowadays hollow-core photonic bandgap fibers (HC-PBGFs) and non-linear phenomena such as soliton pulse compression (SPC) and soliton self-frequency shift (SSFS) are in continuous investigation [1,2,3]
The effect of reducing the cross-section size of the HC-PBGF is the shift of the zero-dispersion wavelengths (ZDWs) to shorter wavelengths and, the second-order dispersion takes more negative values Fig. 2(a)
We have focused on the analysis of the pulse quality evolution in soliton pulse compression and soliton self-frequency shift

Summary

Introduction

Nowadays hollow-core photonic bandgap fibers (HC-PBGFs) and non-linear phenomena such as soliton pulse compression (SPC) and soliton self-frequency shift (SSFS) are in continuous investigation [1,2,3]. Gerome et al reported the existence of soliton compression They achieved output pulses of 90 fs from 195 fs input pulses by using 8 m of tapered fiber [3, 7]. We studied numerically the effects of tuning the cross-section size of a HC-PBGFs on the modal parameters in order to have a fiber structure which promotes pulse compression. We apply such kind of analysis in order to study the pulse quality in both phenomena SPC and SSFS. According to the author’s best knowledge, this is the first report of an analysis of the pulse quality on SPC and SSFS in HC-PBGFs

Theory and numerical procedure

Results and discussion

Conclusions