Microresonator Kerr frequency combs with high conversion efficiency

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Abstract
Microresonator‐based Kerr frequency comb (microcomb) generation can potentially revolutionize a variety of applications ranging from telecommunications to optical frequency synthesis. However, phase‐locked microcombs have generally had low conversion efficiency limited to a few percent. Here we report experimental results that achieveconversion efficiency (on‐chip comb power excluding the pump) in the fiber telecommunication band with broadband mode‐locked dark‐pulse combs. We present a general analysis on the efficiency which is applicable to any phase‐locked microcomb state. The effective coupling condition for the pump as well as the duty cycle of localized time‐domain structures play a key role in determining the conversion efficiency. Our observation of high efficiency comb states is relevant for applications such as optical communications which require high power per comb line. image
Funding Information
  • National Science Foundation (ECCS‐1509578)
  • Air Force Office of Scientific Research (FA9550‐15‐1‐0211)
  • Defense Advanced Research Projects Agency (W31P40‐13‐1‐0018)
  • National Natural Science Foundation of China (61420106003, 6169190011, 6169190012)

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