The National University of Defense Technology's Nanhu Light Laboratory has achieved a breakthrough in hollow-core optical fiber technology.

The Nanhu Light Laboratory of the National University of Defense Technology, in collaboration with several other institutions, has successfully achieved efficient and stable all-fiber transmission of a 2kW high-power laser over an ultra-long distance of 2.45 kilometers. This achievement marks a new stage in the engineering application of high-power, long-range hollow-core fiber technology, moving beyond theoretical exploration. Hollow-core fibers possess advantages such as low latency, low loss, and low nonlinearity; however, existing systems often rely on free-space optical components like lenses, making them susceptible to external environmental interference. The research team designed a five-tube double-nested anti-resonant hollow-core fiber that matches the mode field of solid-core fibers. Through simulation optimization, they determined the optimal structural parameters and successfully fabricated ultra-low-loss hollow-core fibers.