Based on the rigorous coupled-wave theory and medium slab waveguide theory

an AlN wavelength tunable distributed feedback laser is designed by Periodic tunable Bragg grating.The adjustable grating is actuated by comb-drive actuator according to the Micro-Electromechanical（MEMS）technology system and simulated by COMSOL software in 1 310 nm band.The parameters of the DFB laser grating structure are evaluated by analyzing the distribution of a two-dimensional electric mode.Also

the simulation results show that the lasing wavelength and grating period have similar linear relationships

which is consistent with the theoretical analysis.Moreover

one grating period corresponds to a number of different grating heights

and it demonstrates periodic distribution in a 20 nm range.Furthermore

according to the relationship between lasing wavelength and grating period

the possibility of making 1 290

1

330nm-band tunable lasers is presented in this paper.