850 nm hybrid-integrated tunable laser with Si3N4 micro-ring resonator feedback circuits. - Noor A. Schilder; Arnoud S. Everhardt; Tom R. Horner; Dimitri Geskus; Edwin J. Klein; Maaike Benedictus; Sesilia Kriswandhi; F. Schreuder; René G. Heideman (OFC, 2022)