China Telecom Chengdu Branch has launched a tender for the procurement project of hollow core hybrid optical cables for the years 2025-2027, purchasing 146 core hybrid optical cable cores, with a budget of 3. Hollow-core optical fibers (HCFs) have unique properties like low latency, negligible optical nonlinearity, wide low-loss spectrum, up to 2100 nm, the ability to carry high power, and potentially lower loss then solid-core single-mode fibers (SMFs). However, glass imposes a fundamental physical limitation because light travels through it approximately 30 percent slower than through air. This project involves the procurement of 146-core hybrid optical cable cores with a loose tube layered structure, consisting of 1 tube of 2-core hollow-core fiber. Recent advances in reducing optical losses and the prospects for telecommunication applications of hollow-core fibers, issues of transporting high-intensity optical radiation, and results on nonlinear compression and the generation of ultrashort pulses in gas-filled hollow-core fibers are reviewed.
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