Design And Analysis Of The Wavelength-tunable DFB Laser Based On AIN In Double-band

With the development of communication technology,especially the optical communication technology,the bandwidth requirements are also increasing rapidly.The optical communication network with large capacity,high speed and high spectral efficiency has gradually become the mainstream of the next generation communication network.Wavelength tunable laser can simplify the DWDM(Dense Wavelength Division Multiplexing)system;also it can greatly improve the performance of optical communication system.At present,wavelength tunable DFB-LD(Distributed Feedback Laser)has become a crucial part of the optical communication system.In addition,with the development of MEMS(Micro-Electro-Mechanical system)technology,GaN tunable lasers and filters have been reported,but little research has contributed to the integrated wavelength tunable DFB-LD based on the material of AlN.According to MEMS,rigorous coupled-wave theory and medium slab waveguide theory,the AlN wavelength tunable distributed feedback laser is designed by Periodic tunable Bragg grating.The adjustable grating is demonstrated by comb-drive actuator and simulated by Multiphysic Comsol software in 1310 nm band through the numerical calculation and establishment of a tunable two-dimensional DFB-LD model.The output characteristics of the electric field mode of the laser are analyzed under different grating parameters,and the structure parameters of the DFB-LD are determined.Also,the simulation results show that lasing wavelength and grating period present similar linear relationships.One grating period is in corresponding to a number of different grating heights which demonstrate a 20 nm periodic distribution.According to the relationship between lasing wavelength and grating period,the possibility of making 1290nm-1330 nm and 1530-1565 nm band tunable lasers is presented which provides a theoretical basis and data reference for the realization of wavelength tunable DFB-LD.