Microresonator Kerr frequency combs with high conversion efficiency

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• 作者：Xiaoxiao Xue ; Pei-Hsun Wang ; Yi Xuan ; Minghao Qi and Andrew M. Weiner
• 刊名：Laser & Photonics Reviews
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：11
• 期：1
• 全文大小：1022K
• ISSN：1863-8899

文摘

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 achieve ∼30% conversion efficiency (∼200 mW 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.