Fig. 2: Soliton microcomb spectral characterization.
From: Near-visible integrated soliton microcombs with detectable repetition rates
Microcomb optical spectra are measured using devices designed for 1550, 1064, and 780 nm operation, respectively. In the 1064 nm soliton spectrum, the two spikes near 275.37 THz and 288.00 THz are interband Kelly sidebands (KSs). Dispersive waves (DWs) are also indicated in the 1550 and 1064 nm spectra. Insets: the electrical spectra of the photo-detected 1550, 1064, and 780 nm pulse streams. The resolution bandwidth in each spectrum is 1 kHz.
