对波分复用系统中一种重要的解复用器 衍射蚀刻光栅 (EDG)的输出结构进行了研究 ,并提出一种新的采用渐变波导和空气槽相结合的结构设计 ,在保持器件原有的紧凑结构的前提下极大的提高了器件的频谱特性 该结构设计不需要额外的工艺过程 ,并且具有很好的工艺容差性 结构的有效性通过波束传播方法(BPM )和模式传播分析 (MPA)得到了验证 在所给的数值模型中 ,- 1dB带宽和品质因素分别比传统设计提高了 1.4 74和 1.383倍 同时 ,相邻信道间的串扰降低了 15dB以上 ,而整个结构引入的功率损耗仅仅为 0 .65dB An important demultiplexer diffraction grating (EDG) output structure in WDM system is studied, and a new structure design using a combination of a tapered waveguide and an air slot is proposed. Some compact structure of the premise greatly improved the spectral characteristics of the device The structure design does not require additional process and has good process tolerance The effectiveness of the structure Through the beam propagation method (BPM) and mode propagation analysis (MPA) has been verified In the numerical model given - 1dB bandwidth and quality factor respectively 1.474 and 1.383 times higher than the traditional design At the same time, crosstalk between adjacent channels is reduced by more than 15dB, and the power introduced by the entire structure Loss is only 0.65dB