FIG 2 (IMAGE)

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FIG 2

Caption

Figure.2 Experimental results at the flat dispersion regime. (a) Power trace of microcomb evolution from the continuous wave (CW) state to single soliton state. MI: Modulation instability. Ⅰ: Turning Pattern. Ⅱ: Dual-soliton microcomb. Ⅲ: Single soliton microcomb. (b) Radio frequency spectrum of single soliton state. (c) Optical spectrums of Turning Pattern (Ⅰ), dual-soliton microcomb (Ⅱ) and single SMC source (Ⅲ). Via introducing the perfect rectangular spectrum as one standard reference, the single SMC demonstrates the trapezoidal spectrum with weak power-varied spectral profile. (d) Long-term power trace of single SMC.

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