Soliton microcombs, relying on the double balance of dispersion and nonlinearity, as well as gain and cavity loss, are formed in the mode-locked regime of a high-quality micro-resonator. Various soliton microcomb states can provide frequency components with different repetition rates and power, satisfying a variety of applications. Programmable switching of the soliton states increases operational flexibility. Here, we report the programmable switching of soliton microcomb states in a Si3N4 micro-resonator with anomalous dispersion by using an auxiliary laser. Red-detuned pump entrance is implemented to support the reliable judgement of state switching. Single-soliton state was realized in a small frequency tuning range of the auxiliary laser while multi-soliton states can be achieved under a wide range. The achievable soliton state number is related to the relative frequency position of the auxiliary laser. We can realize more number of the soliton states when the auxiliary laser is in the middle of the tuning range.
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