Tunable Q-factor silicon microring resonators for ultra-low power parametric processes

Michael J Strain, Cosimo Lacava, Laura Meriggi, Ilaria Cristiani, Marc Sorel

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)
118 Downloads (Pure)


A compact silicon ring resonator is demonstrated that allows simple electrical tuning of the ring coupling coefficient and Q-factor and therefore the resonant enhancement of on-chip nonlinear optical processes. Fabrication-induced variation in designed coupling fraction, crucial in the resonator performance, can be overcome using this post-fabrication trimming technique. Tuning of the microring resonator across the critical coupling point is demonstrated, exhibiting a Q-factor tunable between 9000 and 96,000. Consequently, resonantly enhanced four-wave mixing shows tunable efficiency between -40 and -16.3  dB at an ultra-low on-chip pump power of 0.7 mW.

Original languageEnglish
Pages (from-to)1274-1277
Number of pages4
JournalOptics Letters
Issue number7
Early online date19 Mar 2015
Publication statusPublished - 1 Apr 2015


  • silicon ring resonator
  • ring coupling
  • silicon microring resonators
  • ultra-low power


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