提出了一种利用传统电弧熔接机实现光子晶体光纤(PCF)与单模光纤(SMF)低损耗熔接的新方案。方案结合实验测量与理论计算,首先通过改变熔接时间、熔接电流等参量,考察了不同熔接功率对PCF端面气孔结构的影响。由此计算了PCF端面模场分布的相应变化,并根据两光纤端面模场的重叠积分计算了相应的熔接损耗,从而确定出对应低熔接损耗的熔接功率区间。综合考虑熔接强度等要求,反向选取了合理的熔接参量范围,实现了PCF-SMF之间低损耗、高强度的熔接。提出的熔接方案使熔接过程中PCF包层气孔的收缩变化、该变化对两光纤接合匹配度的影响等问题清晰化,克服了以往PCF-SMF熔接中难以设定合理熔接参量的问题,有效地提高了熔接效率和熔接质量。

A fusion scheme is proposed for achieving low-loss splice between photonic crystal fiber (PCF) and single-mode fiber(SMF) using conventional arc fusion splicer. Experimental measurements and theoritical calculations are both involved in this sheme. Firstly, how PCF′s air-hole structures varied along with the applied fusion power was observed by changing fusion parameters, such as fusion time and current. Then the mode distributions at the fiber tips and the corresponding splice loss between the two fibers were calculated, and the fusion power range for low splice loss was thus deduced. In return, the optimal sets of fusion splice parameters were determined and low-loss high-strength splicing between the PCF and SMF was achieved. The uncertainties, like the extent of hole contraction of the PCF and its effect on the matching between the two fibers are cleared up in this sheme. Also, the fusion efficiency and quality are both improved owing to the scheme′s effectivity in determining an optimized set of fusion parameters for splicing PCF to SMF.