取样光栅分布布拉格反射(SGDBR)可调谐半导体激光器是一种典型而重要的单片集成光子器件,在宽带光通信系统和智能光网络中有着良好的应用前景.为了分析SGDBR可调谐半导体激光器的动态特性,本文有效地结合了行波法和传输矩阵法的优点,建立了一个适应性广泛、运算高效的分析模型:激光器有源区采用时域行波法,而对结构复杂的无源光栅区则采用频域传输矩阵法,再通过数字滤波器将其变换到时域.利用该模型对SGDBR可调谐半导体激光器波长切换的瞬态光谱和模式竞争进行了细致研究,并提出在不改变载流子密度的条件下,通过增加光栅区耦合因子来提高其波长切换的性能. Sampled grating distributed Bragg reflection (SGDBR) tunable semiconductor laser is a typical and important monolithic integrated photonic device, which has a good application prospect in broadband optical communication system and intelligent optical network.In order to analyze the dynamics of SGDBR tunable semiconductor laser In this paper, we combine the advantages of traveling wave method and transmission matrix method effectively, and establish a widely adaptive and efficient computational model: the active region of laser is time-domain traveling wave method, while the complex structure of passive grating region The frequency domain transfer matrix method is adopted and then transformed into the time domain through the digital filter. The transient spectrum and mode competition of the wavelength switching of the SGDBR tunable semiconductor laser are studied by using the model. Sub-density conditions, by increasing the grating area coupling factor to improve its wavelength switching performance.