对新型低损耗大角度Y分支波导进行了详细的设计和优化,并用有限差分光束传播法对Y分支结构进行了验证。仿真结果表明新型的Y分支波导在大分支角度时具有非常小的损耗。最后,设计了由三个Y分支级联所构成的新型1?光分路器,仿真结果表明其具有损耗小,结构简单,且极大地减小了器件长度,有利于器件的进一步集成。 The new low-loss and large-angle Y-branch waveguide is designed and optimized in detail. The Y-branch structure is verified by the finite difference beam propagation method. The simulation results show that the new Y-branch waveguide has a very small loss at the large branch angle. Finally, a novel 1? Optical splitter consisting of three Y-branch cascades is designed. The simulation results show that the new 1? Optical splitter has the advantages of low loss, simple structure and greatly reduced device length, which is beneficial for the further integration of the device.