Tunable Frequency Comb Generation from a Microring with a Thermal Heater
  We demonstrate a novel comb tuning method for microresonator-based Kerr comb generators. Continuously tunable, low-noise, and coherent comb generation is achieved in a CMOS-compatible silicon nitride microring resonator. 
Xiaoxiao Xue, Yi Xuan, Pei-Hsun Wang, Jian Wang, Dan E. Leaird,   Minghao Qi, and Andrew M. Weiner
physics.optics