▎ 摘　　要

We propose and demonstrate an in-band pumped all-fiberized passively Q-switched laser emitting at 1080 nm. A single mode 1030 nm fiber laser is used as the pump source, while a 2D material, CVD-grown monolayer graphene, is adopted as a saturable absorber inside the ring cavity. The repetition rate of the output pulses can be varied from 12.74 to 24.6 kHz with the pulse duration around 12 mu s. The maximum average output power is 34.25 mW, with the pulse energy of 1.392 mu J. This work proves the practicability of achieving passively Q-switched operation via in-band pump.