Broadband self-switching of femtosecond pulses in highly nonlinear high index contrast dual-core fibre

TL;DR

This paper demonstrates a novel broadband self-switching mechanism for femtosecond pulses in a specially designed highly nonlinear dual-core fibre, showing significant progress in solitonic switching with potential applications.

Contribution

It introduces a new pulse energy-governed self-switching technique in a high index contrast dual-core fibre with broadband capabilities.

Findings

Observed double switching behavior with 16.7 dB contrast

Achieved broadband switching within 150 nm spectrum

Demonstrated a new type of solitonic switching

Abstract

In this paper, we demonstrate a pulse energy-governed nonlinear self-switching of femtosecond pulses at wavelength of 1700 nm in a highly nonlinear high index contrast dual-core fibre. The fibre structure is composed of two microdimension cores and a solid cladding made of two thermally matched soft glasses developed in-house. A double switching behaviour under monotonic increase of the input pulse energy from 1 nJ to 3 nJ was observed at 35 mm fibre length in its anomalous dispersion region. A spatial intensity distribution measurement identified a switching contrast of 16.7 dB, and the registered spectra of the two output channels revealed a broadband switching behaviour within 150 nm. The obtained results indicate a novel type of solitonic switching and represent a significant progress in comparison to the previous experimental works and has a high application potential.