<p>➀ The research on hollow-core fibers is active but not yet widely commercialized due to various reasons, such as incomplete theoretical exploration and immature mass production processes.</p><p>➁ Y10T283 employs three segments of hollow-core fibers spliced together for academic research.</p><p>➂ This year, Changfly manufactured 15km long continuous hollow-core fibers and discussed the impact on performance in large-scale production.</p><p>➃ The wall thickness of the tube for low-loss bands exhibits certain characteristic thicknesses to achieve low-loss design goals.</p><p>➄ Thinner wall thickness results in longer resonance wavelength spacing, wider low-loss bands, but also more sensitive pressure differences.</p><p>➅ Changfly evaluated the tolerance of the inner and outer diameter ratio and pressure difference based on a balance between manufacturing difficulty and performance.</p><p>➆ Changfly selected a low-loss window with a wall thickness of 1.1μm, achieving a minimum loss of 0.25dB/km for 10km hollow-core fibers and about 0.58dB/km for 15km fibers.</p><p>➇ The article also discusses the challenges of manufacturing thin glass tubes and their impact on reliability and cost.</p>