Position-Modulated Pulse Train Generation Based on Mobius Mode-Locked Fiber Laser: Theory

Mobius band has been widely concerned as a non-orientable topological surface. In the area of optics, although recent researches have discussed the characteristics of linear optics in Mobius lasers, the mechanism of ultrafast nonlinear dynamics in Mobius pulsed lasers has still not been revealed. In this paper, for the first time as far as we know, we perform the theoretical investigations in the 2 mu m Mobius mode-locked fiber laser (MMLFL) and demonstrate the position-modulated pulse train generation. Moreover, two kinds of different optical dual-comb phenomena are further obtained in the MMLFL, originating from wavelength multiplexing and polarization multiplexing, respectively. Ourwork expands the understanding of topology in nonlinear optical systems, and might provide a new method for information encoding technology.