Lowest-ever 0.1419-dB/km loss optical fiber. - Yoshiaki Tamura; Hirotaka Sakuma; Keisei Morita; Masato Suzuki; Yoshinori Yamamoto; Kensaku Shimada; Yuya Honma; Kazuyuki Sohma; Takashi Fujii; Takemi Hasegawa (OFC, 2017)