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利用两布拉格光栅反射作用的联合效应形成的双光栅耦合器,具有结构紧凑、滤波效率显著加强的优点.通过详细分析光栅写入特性对器件性能的影响,指出优化光栅在耦合区中的位置,不仅可以使得满足布拉格匹配条件的信号最大效率地下话路输出,还能有效消除背向回波干扰.在此基础上,调节光栅写入长度和紫外折射率调制强度,设计制作出一种结构平衡、上下话路滤波响应同时改善的新型双光栅耦合器.并且在实验中发现,耦合区的非均匀是造成下话路响应平坦性恶化的主要因素,为改进熔融拉锥工艺、进一步提高双光栅耦合器的滤波性能提供了依据.
The double grating coupler formed by the combined effect of the two Bragg grating reflection has the advantages of compact structure and significantly enhanced filtering efficiency.By analyzing the influence of the grating writing characteristics on the performance of the device in detail, the position of the optimized grating in the coupling region is pointed out, Which not only can make the signals satisfying the matching conditions of Bragg, but also can effectively eliminate the back-echo interference.Furthermore, the write length of the grating and the intensity of the ultraviolet refractive index modulation are adjusted, and a balanced structure is designed , The up and down road filter response while improving the new double grating coupler.And in the experiment found that the non-uniform coupling area is caused by the next channel response flatness deterioration of the main factors in order to improve the melt taper technology to further improve the double grating The filter performance of the coupler provides the basis.