Abstract
Loose bunches of soliton molecules (SMs) in a passive mode-locked fiber laser with a WTe2 saturable absorber are observed using the photonic time-stretching (TS) technique. Due to the large temporal separations between the SMs, the TS profiles of the loose bunches appear as the intensity superposition of the spectral interference fringes of the adjacent SMs. The bandwidth limitations and the electronic system sampling rate contribute to the loss of phase information between adjacent SMs and the formation of the intensity overlap profiles. The phase difference and pulse width are estimated using a simulated annealing algorithm.
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