Low Loss Hollow-Core Connecting-Circle Negative-Curvature Fibres

Abstract

Hollow-core negative-curvature fibres have been the focus of current research, but how to reduce the loss of hollow-core negative-curvature fibres is a serious problem. This paper proposes a new structure of hollow-core negative-curvature fibres, that is numerically simulated using the finite-element method, and compared with the simulation results of hollow-core conjoined-tube negative curvature fibres (CTNCFs) and hollow-core nested anti-resonant nodeless fibres (NANFs). The results show that, the LP 01 mode loss can reach 0.003694 dB/km with a transmission wavelength of 1.06 μm, the LP 11 mode loss can be as low as 0.28423 dB/km, and the bending loss is 0.4405 dB/km with a bending radius of 5 cm and a transmission wavelength of 1.06 μm. The loss is reduced by an order of magnitude compared to CTNCFs and NANFs.

An Ultra-Low Bending Loss Negative Curvature Hollow Core Fiber With a Polygon Jacketing Layer

“…1 shows the cross-section of the proposed modified nested 2SCF (MN-2SCF) with a polygonal jacketing layer. Unlike conventional HC-ARFs [31][32][33][34][35], a tube with a polygonal inner boundary was introduced as the jacketing layer of the fiber. The single-ring HC-ARF with a polygonal jacketing layer has been explored numerically and experimentally [33].…”

Ultra-Low-Loss Hollow-Core Bragg Antiresonant Fiber With Super Bandwidth Transmission Window

“…HC-ARF length was reported up to 2185 m in 2021 [10].However, according to current research progress, fiber length and bend loss are the most significant barriers to the application of HC-ARFs [15,26,27].Here, the structure of the proposed HC-BARF can be realized at a long distance; however, bend loss has a greater effect on the application of HC-BARF than the length of the fiber [27]. Therefore, according to the reference [28,29], the bend loss of HC-BARF was studied using a commercial finite element method. As shown in Fig.…”

Designing hollow core nested anti-resonant fiber with ultra-low loss using finite difference eigen mode solver

“…Noteworthy, out of all numerically designed fiber geometries with significantly low loss in near infrared domain, few designs need special mention. One such host is a NARF with nested double cladding rings [37] which exhibit losses of 1 × 10 −3 dB km −1 at 1400 nm, NARFs with connecting circle or, elliptical nesting circular tube also predict 0.7 × 10 −3 -3.694 × 10 −3 dB km −1 at 1.06 µm [38,39]. However, these designs introduce additional AR membranes which could pose a fabrication challenge.…”