[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