Data transmission through up to 74.8 km of hollow-core fiber with coherent and direct-detect transceivers. - Maxim Kuschnerov; Vincent A. J. M. Sleiffer; Yingkan Chen; Erik De Man; Yong Chen 015; Zhixin Liu; Seyed Reza Sandoghchi; Gregory T. Jasion; Tom Bradley; Eric R. Numkam Fokoua; John R. Hayes; Natalie V. Wheeler; et al. (ECOC, 2015)