为了有效耦合平头发光二极管(LED),使用机械方法加工了锥球面塑料光纤(POF)微透镜.平头发光二极管由圆头发光二极管打磨掉聚光帽制得,其出光端面与芯片距离小于0.5 mm.锥球面塑料光纤微透镜用数控机床加工制得.采用光线追迹法对耦合模型进行了分析.实验优化了锥球面光纤微透镜的参数、锥角、小球半径、工作距离和单端/双端模式,并理论分析了双端锥球面微透镜耦合的实验结果.当双端锥球面光纤微透镜锥角为140°、小球半径为0.15 mm时,可带来20.4％的耦合效率增益.所用加工方法有利于微透镜参数优化,具有较好的加工精度和重现性,可以用于制作塑料光纤微透镜.%In order to efficiently coupling a flat-end LED,mechanical method was employed to fabricate tapered hemispherical-end fiber (THEF) plastic optical fiber (POF) microlenses.The flat-end LED was made by grinding off the dome of the original domed LED to 0.5 mm close to the chip.The THEF POF microlenses were made by a Numerical Control Lathe.The optical process was analyzed by ray tracing.Parameters of the THEF microlenses,i.e.taper angle,spherical radius,working distance,and double-ends fabricated were experimentally optimized.And the experimental result of double-ends fabricated was analyzed theoretically.The doubleends fabricated THEF microlens with taper angle of 140°,spherical radius of 0.15 mm brought 20.4％ coupling efficiency enhancement.The fabrication method was beneficial to parameters optimization of microlenses,with good machining precision and reproducibility,applicable to POF microlenses fabrication.
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