Fig. 2: Soliton states generation for broadband frequency synthesis. | Nature Communications

Fig. 2: Soliton states generation for broadband frequency synthesis.

From: Low-noise frequency synthesis and terahertz wireless communication driven by compact turnkey Kerr combs

Fig. 2: Soliton states generation for broadband frequency synthesis.

a Upper panel: optical spectrum of a single soliton state. Left inset: autocorrelation trace of single soliton pulse. Right inset: RF beatnote of single soliton state centered at 10.1 GHz. RBW, resolution bandwidth. Lower panel: optical spectrum of a two-soliton state. Inset shows the relative phase position of the solitons in a round-trip inside the FFPR. b Optical spectra of soliton crystal states with different comb spacings. c Optical spectra of soliton crystal states in two Kerr comb packages. d 8-time consecutive switches test for turnkey operation. The top panel is a spectrogram of the soliton repetition rate signal measured during the switching process. The bottom panel shows the measured comb power as a function of time. e Setup of the Kerr comb-based terahertz source (KCTS). EDFA erbium-doped fiber amplifier, UTC-PD uni-traveling-carrier photodiode, LNA low-noise amplifier. f Measured terahertz power as a function of input optical power on UTC-PD.

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