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High finesse silicon ring resonators for monolithic mode-locked lasers

Low noise mode-locked lasers and stabilized optical frequency combs are receiving considerable attention due to their broad spectrum of applications which ranges from signal processing to communications to metrology. Progress has been made in the realization of ultralow noise pulse trains by using ultralow expansion (ULE) quartz etalons for filtering the axial mode groups. An important step towards miniaturization of these systems is the integration of a high finesse on-chip optical filter that would serve to replace the ULE etalon. In this paper, we report our experimental results towards the realization of such a high finesse cavity based on a silicon microring resonator.