Single-polarization single-mode hollow-core negative curvature fiber with nested U-type cladding elements

Abstract

Hollow-core negative curvature fibers (HC-NCFs) have become one of the research hotspots in the field of optical fiber because of its potential applications in the data and energy transmissions. In this paper, a new kind of single-polarization single-mode HC-NCF with nested U-type cladding elements is proposed. To achieve the single-polarization single-mode transmission, we use two different silica tube thicknesses that satisfy the resonance and anti-resonance conditions on the U-type cladding elements and the cladding tubes, respectively. Besides, the elliptical elements are introduced to achieve good single-mode performance. By studying the influences of the structure parameters on the propagation characteristics, the optimized structure parameters are obtained. The simulation results show that when the wavelength is located at 1550 nm, the single-polarization single-mode transmission is achieved, along with the polarization extinction ratio of 25749 and minimum high-order mode extinction ratio of 174. Furthermore, the confinement loss is only 0.0015 dB/m.

Influence of cladding tube structure on transmission characteristics of negative curvature terahertz fiber

“…performance is critical for the practical application of terahertz systems. Negative curvature hollow core fibers are commonly used in relevant studies due to their simple cladding structure [4] and the extensive degree of design flexibility they offer. Negative curvature fiber, with its large hollow region in the cladding tube and core, offers the potential for a wide range of applications such as sensing, polarization, and laser transmission.…”