“…Moreover, in addition to the large mode spacing, the Kerr combs also show the advantages of simplicity, small size, high degree of integration, and low power consumption. [16,17] Therefore, as the supplement for the traditional mode-locked laser-based frequency combs, the Kerr combs with high repetition frequencies are desirable for many applications, for example, calibration of astronomical spectrograph [18] and coherent terabit communications. [19] Meanwhile, the generation of the optical Kerr frequency combs has also been studied theoretically.…”