this paper, a periodic lithium niobate (LiNbO3) electro-optical intensity modulator with a fiber pigtail-type Mach Zengde (MZ) structure is used for active Q-tuning, and a tunable filter is designed to be incorporated into the ring cavity structure to achieve stable output of tunable pulsed lasers with wavelengths in the range of 1882 nm-1992nm. By adjusting the signal frequency applied to the modulator, pulse lasers with a tunable repetition frequency between 15 kHz and 70 kHz are produced. At a repetition frequency of 15 kHz and a pump power of 1 W, the maximum single-pulse energy obtained is 6.4 μJ, with a peak power of 5.1W. This research exhibits advantages of all-fiber configuration and a wide tunable wavelength range, contributing to further exploration of the tunable range and potential applications of Q-switched pulse lasers.