Adaptive-optics is a type of optoelectromechanical integration technology. A deformable mirror, as the core device of an adaptive-optics system, corrects the wavefront by changing its own surface distribution to change the optical-path difference of the incident wavefront sensor. The travel amount and resolution of the deformable mirror directly determine the accuracy and extent of the wavefront correction. A single deformable mirror usually cannot correct the results of a strong-turbulence environment, high-power laser output, or large-aperture optical-system reception. These significantly distort the wavefronts of light waves, and the actuator service life is shortened when working near full stroke for a long time. Therefore, a fast steering mirror or multi-stage deformable mirror is introduced. A fast steering mirror (FSM) or large-travel deformable mirror is used to correct the low-order components of the wavefront, while a small-travel deformable mirror is used to correct the high-order components, thereby correcting the wavefront in a optical wireless communication system.