仿真FBG传输特性，共三个函数，利用光纤的传数矩阵和耦合模理论，可在main函数中修改参数-Simulation FBG transmission characteristics of the three functions, the use of optical fiber transmission matrix and coupled-mode theory, the parameters can be modified in the main function

利用简单的发送与接收函数来实现正方形处理器网格上的MPI并行程序(Implementation of matrix multiplication with simple transmission and reception)