本文研究了单模光纤与Ti内扩散LiNbO3单模平面光波导的端面激励耦合问题。测量了它们的场强分布轮廓,给出了两者位置失配影响耦合效率的实验数据。在光纤输出端用光致抗触剂制作一个微透镜,缩小光纤输出的高斯光束束腰尺寸,耦合效率提高了1.47倍,与理论计算值相符。

The end fire coupling between the single-mode optical fiber and the Ti-diffused LiNbO3 single-mode planar optical waveguide has been studied. Here we report our measurements of the field intensity distribution and the experimental results of coupling efficiencies under the influence of various alignment tolerances. Using a photoresist to produce a microlens directly at the end of a fiber. The Gaussian waist diameter of the fiber output is reduced and the coupling efficiency has been improved by 1.47 times, which is conformable with the theoretical values.