基于传输线激光器模型的调制光栅Y分支激光器仿真北大核心CSCD

调制光栅Y分支激光器(modulated grating Y branch laser,MGY)是光纤光栅解调系统的理想光源,目前鲜有针对其调谐特性的建模研究,为研究MGY的调谐特性,本文将传输线激光器模型(transmission line laser model,TLLM)推广到模拟MGY,采用TLLM、传输矩阵法(transfer matrix method,TMM)与数字滤波方法相结合的组合模型对模拟MGY进行研究。在组合模型中,对增益区和相位区使用基于时域的TLLM;对左、右调制光栅(left/right modulated grating,LMG/RMG)区先使用基于频域的TMM进行表征,然后通过反向傅里叶变换为时域模型,成功模拟了MGY的输出-电流特性曲线、静态调谐特性等,与已发表的实验结果相近。此综合方法可用于研究使用频域模型难以获得的器件的瞬态响应和激光光谱特性。

Simulation of modulated grating Y-branch laser based on transmission line laser model

A modulated grating Y-branch laser (MGY) is an ideal light source for fiber grating demodulation system.At present,there are few modeling studies on its tuning characteristics.In order to study the tuning characteristics of MGY,this pape r extended the trans mission line laser model (TLLM) to simulate MGY.The Y-ty pe laser with ana log modulated grating is studied by combining the TLLM, transmission matrix method (TMM) and digital filtering method.In the combined model,we use the TMM method based on time domain for the gain region and phase region.Fir stly,the TMM based on frequency domain is used for the left and right modulated grating (LMG/RMG) regions, and then the inverse Fourier transform is used as the time domain model.The out put current char acteristic curve and static tuning characteristic of the MGY are simu lated successfully,which is similar to the published experimental results.This comprehensive model can be used to study the transient response and laser spectra of devices t hat are difficult to obtain using frequency-domain models.