以两平行长周期光栅耦合器的通用模型为依据,全面分析了两光栅完全对准和存在纵向偏离时器件性能的稳定性.在此基础上深入研究光栅调制强度、环境折射率以及光纤包层厚度等因素的影响,确定出实现100%上下话路滤波效率的条件.初步的实验结果表明,不需要对光纤包层进行处理,利用两平行长周期光栅耦合器完全可以实现有效的上下话路.这为进一步简化制作工艺提供了依据. Based on the general model of two parallel long-period grating couplers, the stability of the device performance when the two gratings are fully aligned and there is vertical deviation is analyzed thoroughly. On this basis, the effects of grating modulation intensity, ambient refractive index and fiber cladding Thickness and other factors to determine the conditions to achieve 100% of the upper and lower channel filter efficiency.Preliminary experimental results show that the fiber cladding does not need to be processed, the use of two parallel long-period grating coupler can be fully up and down the road This provides the basis for further simplifying the manufacturing process.