%0 Journal Article %J Applied Physics Letters %D 2012 %T Grating-coupled silicon microring resonators %A Shi, Wei %A Wang, Xu %A Zhang, Wen %A Yun, Han %A Lin, Charlie %A Chrostowski, Lukas %A Jaeger, Nicolas %N 12 %P 121118 - 121118-4 %U http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=APPLAB000100000012121118000001&idtype=cvips&doi=10.1063/1.3696082&prog=normal&bypassSSO=1 %V 100 %X We propose to integrate grating-assisted asymmetric couplers with microring resonators for selective resonance excitation and control of coupling efficiency. A grating-coupled microring add-drop filter is experimentally demonstrated using a silicon-on-insulator technology compatible with complementary metal-oxide-semiconductor processing. A dominant longitudinal mode with a side-mode suppression ratio of 8 dB has been obtained across a broad spectral range of over 130 nm. The selected mode shows an out-of-band-rejection ratio of 19 dB and a quality factor (Q) of 25 000. The concept of integrating grating-assisted couplers for mode selectivity can be applied to other microring-based devices for high-Q, single-mode operations. %8 03/2012