An Yb-fiber frequency comb phase-locked to microwave standard and optical reference<xref rid="cpb_29_3_030601fn1" ref-type="fn">*</xref><fn id="cpb_29_3_030601fn1"><label>*</label><p>Project supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant Nos. XDA1502040404 and XDB21010400) and the National Natural Science Foundation of China (Grant Nos. 91850209 and 11774234).</p></fn>

An Yb-fiber frequency comb phase-locked to microwave standard and optical reference**

Project supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant Nos. XDA1502040404 and XDB21010400) and the National Natural Science Foundation of China (Grant Nos. 91850209 and 11774234).

Wang Hui-Bo^{1, 2}, Han Hai-Nian^{2, 3, †}, Zhang Zi-Yue^{2, 3}, Shao Xiao-Dong^{2, 3}, Zhu Jiang-Feng¹, Wei Zhi-Yi^{1, 2, 3}

(a) Octave-spanning spectrum after the tapered photonic crystal fiber. The two dotted lines indicate the spectral components used for generating the f_ceo signal. (b) Detection of free-running f_ceo signal in 100 kHz resolution bandwidth.