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锥形透镜光纤(TLF)是实现光纤与平面光波光路(PLC)芯片高效耦合的核心元件。了解和掌握其聚焦特性是指导平面光波光路尾纤封装技术的关键。给出了表征锥形透镜光纤聚焦特性的两个参量出射光斑直径和远场发散角的理论分析模型,其误差小于1.14%;采用光束传播法数值模拟了锥形透镜光纤中的光波传输和模斑的演化,确定了锥形透镜光纤端面出射光斑的大小;优化锥形透镜光纤结构参量为:拉锥长度300μm,锥角0.733°,透镜曲率半径13.485μm;建立了基于数字摄像机的锥形透镜光纤出射光场测试系统,提出了物理光学反向推演法,计算出锥形透镜光纤聚焦光斑尺寸和远场发散角。理论与实验结果有着良好的一致:对于相同结构参量的锥形透镜光纤,实验反推法得到的出射光斑尺寸与理论值相比误差为3.15%,远场发散角误差为3.67%。
Cone lens fiber (TLF) is the core element for efficient coupling between optical fiber and planar lightwave circuit (PLC) chip. Understanding and mastering its focusing characteristics is the key to guiding the planar lightwave optical fiber pigtail package technology. The theoretical analysis model of two parameters of spot lens diameter and far-field divergence angle, which characterizes the focusing characteristics of conical lens fiber, is given and the error is less than 1.14%. The light propagation and mode The evolution of the spot and the size of the exiting spot of the end face of the conical lens fiber are determined. The parameters of the conical lens fiber structure are as follows: the length of the conical lens is 300 μm, the cone angle is 0.733 ° and the radius of curvature of the lens is 13.485 μm; Optical fiber exit optical field test system, put forward the physical optics reverse deduction method to calculate the tapered lens fiber focal spot size and far-field divergence angle. The theoretical and experimental results are in good agreement. For the conical lens fiber with the same structural parameters, the error of the spot size obtained by the experimental deduction method is 3.15% compared with the theoretical value, and the far-field divergence angle error is 3.67%.