Hollow core Bragg fiber with antiresonant intermediate layer

TL;DR

This paper investigates how an intermediate layer in hollow core Bragg fibers influences optical properties, demonstrating that parameter optimization can significantly reduce optical loss in single-mode regimes.

Contribution

It introduces a novel analysis of the intermediate layer's effects on optical loss, showing potential for improved fiber performance through parameter tuning.

Findings

Optical loss decreases with increased intermediate layer thickness in multi-mode regime.

Optical loss reduces as the refractive index of the intermediate layer increases in single-mode regime.

Proper parameter selection can reduce optical loss by an order of magnitude compared to traditional fibers.

Abstract

By means of the transfer matrix method, the optical properties of fibers with a distinct intermediate layer between a hol-low core and periodic cladding are calculated. The periodic cladding consists of two types of the alternating layers. The intermediate layer has distinct thickness and refractive index. Depending on these parameters, the fiber can work in the single-mode or multi-mode regimes. In the multi-mode regime, the optical loss of the smallest loss mode can be de-creased by increasing the thickness of the layer. In the single-mode regime, the optical loss falls with a rise in the refrac-tive index of the intermediate layer. The optical properties of the fiber are determined by the antiresonance reflection from the intermediate layer and the Bragg reflection from the periodic cladding. Selecting the parameters of the interme-diate layer, the optical loss of the fiber in the single-mode regime can be reduced by an order of magnitude over the loss of the traditional Bragg fiber.