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在一维光纤光栅的结构中,两端附加上完全吸收匹配层(PML),用有限时域差分方法(FDTD),在PML层中,Maxwell方程独立项用前后时间节点的平均值,并且选择适当的时间间隔△t,可以得到光波在光纤光栅中的传播性质。发现:光纤光栅中的介质折射率的差别能够明显改变传播光的频谱结构,而在折射率一定时,通过改变光纤光栅的空间周期,对传播光的影响不明显。在ε1r=15,ε2r=1,光纤光栅分为10段时,在9×1013到3×1015Hz范围内,光纤光栅对光的透射率很低。
In the structure of a one-dimensional fiber grating, the complete absorption matching layer (PML) is added to both ends, and the FDTD method is used. In the PML layer, the Maxwell equation is independently used as the average of the front and back time nodes, The appropriate time interval △ t, you can get the light wave propagation properties in the fiber grating. It is found that the difference of medium refractive index in FBG can obviously change the spectrum structure of propagating light. When the refractive index is constant, the influence of propagating light is not obvious by changing the spatial period of FBG. In the case of ε1r = 15 and ε2r = 1, when the fiber grating is divided into 10 sections, the transmission of light by the fiber grating is very low in the range of 9 × 1013 to 3 × 1015 Hz.