[D-4-2] Long Cavity DFB Laser for Linewidth Narrowing Shouichi Ogita、Yuji Kotaki、Katsuhiro Kihara、Manabu Matsuda、Hiroshi Ishikawa (1.Fujitsu Laboratories Ltd, Atsugi) https://doi.org/10.7567/SSDM.1988.D-4-2