FSR-free silicon-on-insulator microring resonator based filter with bent contra-directional couplers Eid, Nourhan ; Boeck, Robert ; Jayatilleka, Hasitha ; Chrostowski, Lukas ; Shi, Wei ; Jaeger, Nicolas A. F. Abstract Publication: Optics Express Pub Date: December 2016 DOI: 10.1364/OE.24.029009 Bibcode: 2016OExpr..2429009E