Fig. 2: A library of 1–32 soliton crystals.
a Illustration of the experimental set-up, the wavelength of the pump light is fixed, while the wavelength of the control light is tunable for both SC switching and intracavity thermal balancing. EDFA erbium-doped fiber amplifier, FPC fiber polarization controller, Cir. circulator, PD photodiode, TEC thermoelectric cooler, OSC oscilloscope, ESA electric spectrum analyzer, OSA optical spectrum analyzer, Auto. autocorrelator. b Butterfly-packaged device with a 20.5-mm-diameter Chinese coin for comparison (upper panel). Microscope image of the high-index doped silica glass microring resonators with a diameter of ~1.2 mm (lower panel). c Complete optical spectra for 1–32 synthesized SC with smooth sech2 envelope (red dashed line).
