Figure 2: ‘Munich Olympic stadium’ comb and interleaved comb state.
From: Phase steps and resonator detuning measurements in microresonator frequency combs
(a–c) and (d–f) show measurements of two different phase-locked comb states. The corresponding time domain traces in c and f are calculated based on the measured spectral amplitudes and phases. The comb state in a–c (‘Munich Olympic Stadium’-Comb) shows distinct phase steps of π between different sections. The comb state in d–f contains interleaved sections with double-free spectral range (FSR) mode spacing and a mutual phase offset of π/2. The phases of the stronger modes (every 15th FSR, black crosses in the phase plot) are not aligned with the rest of the comb.
