I. Introduction
Multiwavelength mode-locked fiber lasers (MW-MFLs) [1]–[3] have attracted considerable research interest because of their versatile applications, including optical communications, fiber optic sensing, photonic component characterization and microwave/terahertz photonics. Especially, by further shaping the mode-locked pulses to optical solitons, MW-MFLs become more fascinating due to the good stability, low timing jitter and short pulse width.