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基于不失调透镜系统对高斯光束的变换机理,提出并分析了一种低损耗、高强度连接光子晶体光纤(PCF)的透镜耦合方法。与熔接法相比,该方法可实现各类PCF之间以及PCF与普通光纤之间的有效模式转换,并连接因热膨胀系数极其不同而无法拼接或熔接的光纤。在此基础上,搭建了相应的PCF透镜耦合连接及特性测试实验台,实现了单模PCF和常规G.652光纤之间以及保偏PCF和常规G.652光纤之间的高重复性、高强度连接,连接损耗均值分别为0.4dB和0.65dB,并对实验结果进行了误差分析,提出了存在的问题及改进设想。
Based on the transformation mechanism of Gaussian beam without the lens system, a method of lens coupling with PCF (low loss and high intensity) photonic crystal fiber is proposed and analyzed. Compared with the soldering method, this method can realize effective mode conversion between various PCFs and between PCFs and ordinary optical fibers and connect optical fibers that can not be spliced or fused due to extremely different thermal expansion coefficients. On this basis, a corresponding PCF lens coupling connection and characteristic test bench is set up, which achieves high repeatability and high repeatability between the single mode PCF and the conventional G.652 optical fibers and between the polarization maintaining PCF and the conventional G.652 optical fibers The mean values of the strength connection and the connection loss are 0.4dB and 0.65dB, respectively. The error analysis of the experimental results is carried out, and the existing problems and the improvement assumptions are proposed.