选用紫外固化型环氧树脂，采用光刻技术在FR-4基板上制备了平行排布的多模聚合物光波导。波导具有阶跃折射率分布，相邻波导间隔为250 μm，可与并带后的50 μm芯径多模光纤实现多通道低损耗耦合。通过搭建测试平台，对波导的插入损耗、串扰及错位容限进行了测量与分析。实验结果表明，所制备光波导的损耗小于0.05 dB/cm，串扰小于-60 dB。波导在错位容限方面性能良好，当输入端错位±5 μm时，系统增加的插入损耗小于0.2 dB。同时根据实际波导建立仿真模型，采用光束传播法分析了不同入射条件下的模式能量分布、差分模式延时及耦合效率。计算结果表明，使用与波导具有相近纤芯尺寸的入射光纤不仅可以减小耦合损耗和串扰，还能减少激发起的高阶模式数，提高波导的距离带宽积，优化光波导的综合传输性能。所制备的聚合物光波导作为组成光印刷电路板的核心光器件具有良好的应用前景。

Polymer optical waveguides are fabricated on FR-4 substrates with UV-curable epoxy resins by the lithography method. The experiment results show that the typical loss and the crosstalk of the waveguides are less than 0.05 dB/cm and -60 dB, respectively. Moreover, the waveguides exhibit good misalignment tolerance. When there is a misalignment of ±5 μm at the input end, the increased insertion loss is less than 0.2 dB. A simulation model based on beam propagation method is used to investigate the mode power distribution, differential mode delay, and dependence of coupling efficiency on the launching conditions. The results indicate that using a fiber with core diameter comparable with the size of the waveguide excites fewer higher order modes and largely improves the waveguide performance. The fabricated optical polymer waveguides are promising as key devices for optical printed circuit board applications.