Towards Ultra-Large Bandwidth and a New Class of Specialty Optical Fibers

TL;DR

This paper introduces a novel specialty optical fiber design with hybrid chirped cladding that achieves an ultra-wide photonic bandwidth of approximately 3 microns, enabling efficient short pulse delivery and enhanced frequency broadening.

Contribution

The paper presents a new fiber geometry based on thermally compatible chalcogenide glasses with bandgap overlapping, achieving ultra-wide bandwidth and low dispersion.

Findings

Achieved ~3 micron ultra-wide bandwidth

Demonstrated zero dispersion at ~2.7 micron

Enabled efficient short pulse delivery with less distortion

Abstract

We propose a scheme to enhance the effective photonic bandwidth exploiting bandgap overlapping of same order or different orders through judiciously chosen aperiodic geometries is spatial dimension. To implement the scheme, we design a specialty optical fiber with hybrid chirped-cladding. Our designed fiber provides an ultra-wide photonic bandwidth of ~ 3 micron. The less dispersive behavior of the structure carries the signature of zero dispersion at ~2.7micron. The proposed two material all-solid fiber geometry is based on thermally compatible chalcogenide glasses, GeAsSe and AsSe as low and high index respectively. The efficient delivery of short pulses with less distortion, and enhanced frequency broadening of specific pulses at certain conditions are demonstrated through these specialty fibers.