Highly Birefringent Anti-Resonant Hollow-Core Fiber With a Low Loss

Abstract

In recent years, anti-resonant hollow-core fibers (known as AR-HCFs) have gradually become one of the research hotspots. However, their loss and birefringence properties are often difficult to reconcile. In this letter, a new structure of AR-HCF is proposed by analyzing the factors that affect their loss and birefringence. The fiber features a negative curvature core surround, double-layer structures, and two half-tubes containing nested tubes. Based on COMSOL Multiphysics, the designed AR-HCF has a high birefringence of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$1.3\times 10 ^{-4}$ </tex-math></inline-formula> and a low confinement loss of 6.1 dB <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\cdot $ </tex-math></inline-formula> km−1 at 1550 nm, a bandwidth of 40 nm, bending resistance and single-mode operation.