A second tube was then nested inside it, and later an even smaller tube was nested inside the second tube, leading to the term double nested antiresonant nodeless hollow-core fiber (DNANF). Nested glass tubes, developed by Microsoft and University of Southampton engineers, will help bring about a new era of data connectivity. Gregory Jasion and Francesco Poletti/University of SouthamptonHow Will Hollow-Core Fiber Cables Be Deployed? Hollow-core fiber cables, says Francesco Tani, a researcher in optics at the National Centre for Scientific Research in Lille, France, “have advanced beyond imagination over the past 10 years…. Moreover, Yingying Wang, the founder of Linfiber, announced at this year’s Optical Fiber Communications Conference in March, that Linfiber has achieved “a continuous drawing of a 47.5-kilometer hollow-core fiber with loss of 0.1 dB per kilometer.”