Generation of Hofstadter’s butterfly spectrum using circular arrays of microring resonators

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Tyler J. Zimmerling and Vien Van, "Generation of Hofstadter’s butterfly spectrum using circular arrays of microring resonators," Opt. Lett. 45, 714-717 (2020) (web)

Group Delay Enhancement in Circular Arrays of Microring Resonators

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V. Van, T. -. Ding, W. N. Herman and P. -. Ho, “Group Delay Enhancement in Circular Arrays of Microring Resonators,” in IEEE Photonics Technology Letters, vol. 20, no. 12, pp. 997-999, June15, 2008 (web)