光纤照明用LED耦合装置设计

光纤照明用LED光源耦合装置多采用透镜组，其汇聚光斑小，但透镜组光能损失大。针对LED光源发光特性及聚合物光纤孔径大的特点，提出LED灯珠侧式安装和反射器切割移位优化法，设计一种基于椭圆反射器的光纤照明用LED耦合装置。运用John OFarrell的逼近算法计算出不同偏心率的椭圆反射器结构参数，结合光纤光学参数仿真比较耦合光效，得到一组偏心率和光纤直径匹配的高效耦合装置结构参数，并运用该方法设计了一款光纤直径10 mm、数值孔径0.5的光纤照明用LED耦合装置，其理想耦合光效达93.35%。

LED coupled device for fiber-optic illumination

Coupled device with LED light source for fiber-optic illumination is often composed of lens group. Though the convergence spot of this system is small, the light loss of lens group is big. Due to the characteristics of LED light source and the big aperture of polymer optical fiber, an side installation for LED lamp and an optimization method that reflector was cutted and shifted were put forward,and a kind of coupled device with LED light source based on elliptical reflector was designed. Using the approximation algorithm that had been proposed by John OFarrell, the elliptical reflectors structure parameters for different eccentricities were calculated. Through comparing the coupling efficiency by combining with the simulation of fibers optical parameters, a group of structural parameters of efficient coupled device that the eccentricity matched the fiber diameter were obtained. Using this method, a coupled device with LED light source was designed which had a fiber diameter of 10 mm and numerical aperture of 0.5.The ideal coupling efficiency was up to 93.35%.