“…Due to the simultaneous generation of pulses at different wavelengths, multiwavelength pulsed fiber lasers possess versatile applications in wavelength division multiplexing systems, fiber-optic sensors, and optical spectroscopy. To date, several passively mode-locked techniques such as semiconductor saturable absorber (SESAM) [1], [2], nonlinear polarization rotation (NPR) [3], [4], nonlinear amplifying loop mirror (NALM) [5], carbon nanotubes (CNT) [6], [7], graphene [8] and topological insulator [9] have been used to achieve multiwavelength passively mode-locked pulses in fiber lasers. However, all the multiwavelength pulses mentioned above are hyperbolic secant pulses.…”