Low latency transmission over 400 m Hollow-Core-Fiber Cable at 100G PAM-4 per wavelength. - Jose M. Castro; Bulent Kose; Rick J. Pimpinella; Paul Huang; Brett Lane; Gabe Puc; Tristan Kremp; Kyle Dube; Mohandtahar Irid; Brian J. Mangan (OFC, 2021)