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在近场光学显微镜、高功率光纤耦合器等应用场合,需要对熔锥光纤中的光场分布有更精确的了解。基于锥形函数,应用时域有限差分法模拟了熔锥光纤中的光场分布,分析了熔锥参数对单锥形光纤和双锥形光纤传输效率的影响,并与使用基模高斯近似得到的结果进行了比较。结果表明:使用基模高斯近似分析熔锥光纤的光场会产生较大误差;在形态分布对称的熔锥光纤中光场分布是非对称性的,基模场入射熔锥光纤后会在熔锥光纤中激发出泄漏模,对于单锥形和双锥形结构的熔锥光纤,初始熔融长度和拉伸长度对传输效率均有影响。应根据具体的应用情况,确定熔锥参数,以获得更高的传输效率。
Applications such as near-field optical microscopy and high-power fiber couplers require a more accurate understanding of the light field distribution in fused-cone fibers. Based on the cone function, the time-domain finite difference method is used to simulate the light field distribution in the fused cone fiber. The influence of the fused cone parameter on the transmission efficiency of the single-tapered fiber and the double-tapered fiber is analyzed and compared with the Gaussian approximation The results were compared. The results show that there is a big error in using the fundamental mode Gaussian approximation to analyze the optical field of the fused cone fiber. The distribution of the optical field in the tapered fiber with asymmetric distribution is asymmetric. After the fundamental mode field is incident on the tapered fiber, The leakage mode is induced in the optical fiber. For the single-taper and double-taper fused-cone fibers, the initial melt length and the length of the stretch affect the transmission efficiency. Should be based on the specific application, determine the parameters of the molten cone in order to obtain higher transmission efficiency.