Narrow Linewidth Hybrid InP-TriPleX Photonic Integrated Tunable Laser Based on Silicon Nitride Micro-ring Resonators. - Yi Lin; Colm Browning; Roelof Bernardus Timens; Douwe H. Geuzebroek; Chris G. H. Roeloffzen; Dimitri Geskus; Ruud M. Oldenbeuving; René G. Heideman; Youwen Fan; Klaus J. Boller; Jialin Zhao 002; Liam P. Barry (OFC, 2018)