Single-Polarization, Low-Loss, and High-Manufacturability Hollow-Core Fiber Based on Truncated Capillary Glass Tubes

In this paper, a novel single-polarization hollow-core antiresonant fiber (SP-HC-ARF) is proposed. By introducing truncated capillary glass tubes in the cladding and optimizing the glass thickness, the fiber achieves excellent performance at the wavelength of 1550 nm, including a high-order mode extinction ratio (HOMER) of 134, a polarization extinction ratio (PER) of 309, a birefringence of approximately 1.76 × 10⁻⁵, and an ultra-low transmission loss of 0.0034 dB/m. Moreover, the cladding size is reduced by 19.98% compared to conventional nested-tube structures. This design demonstrates great potential for applications in polarization-sensitive communication systems.