Pulsing Manipulation in a 1.55- <tex-math notation='LaTeX'>$\mu \text{m}$ </tex-math> Mode-Locked Fiber Laser by a 1- <tex-math notation='LaTeX'>$\mu \text{m}$ </tex-math> Optical Pattern

It is difficult to manipulate the pulse distribution of a multipulse passively mode-locked fiber laser, and an effective solution is yet to be demonstrated. Here, we all-optically manipulate the pulsing of a mode-locked fiber ring laser at a telecommunication window (1.5 $\mu \text{m}$ ) by an optical pattern at 1 $\mu \text{m}$ . It can be demonstrated as an effective solution by examining different optical patterns modulated on an external laser source. In particular, the minimum pulse separation being manipulated by the external optical pattern can be shorter than 20 ps. It is noted that, with such a large wavelength separation between the cavity and the external sources, i.e., $\sim 1550$ and 1060 nm, respectively, our scheme can simultaneously serve as an ultra-wideband wavelength convertor.