➀ The article discusses the advantages and disadvantages of hollow core fibers compared to solid core fibers.➁ Jilin University has made progress in small-size hollow core fibers.➂ The article mentions the collaboration between Jilin University, Lianxian Technology, and other entities for hollow core fiber trials.➃ The trial used a nodeless anti-resonant structure with triple-tube double anti-resonant structure, achieving a minimum loss of 0.11dB/km.➄ Traditional fiber nonlinear effects can be ignored with hollow core fibers, which is crucial for improving signal-to-noise ratio.➅ Trials were conducted in Suzhou in September 2024, testing loss, dispersion, and Rayleigh backscattering without system transmission verification.➆ ECOC2024 showcased trials with a triple-tube double anti-resonant structure, achieving a loss of 0.14dB/km for the cable and 0.13dB/km for the overall fiber.