《变迹相移光纤光栅传输谱的研究》仿真代码请搜索“光纤光栅的传输谱特性,研究了均匀光栅，相移光栅，啁啾光栅的特性”-" Phase shift of apodized fiber grating transmission spectrum of"　simulation code search for " fiber grating transmission spectrum characteristics of a uniform grating, phase shifted grating, chirped grating characteristics"