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通过改变多孔光纤中的芯区面积、空气孔的直径和分布,可以灵活地设计其导波特性。利用耦合波方程分析了参量波长变换的基本原理,讨论了信号波长固定情况下相位失配和抽运波长之间的关系。对基于多孔光纤的参量波长变换的转换效率进行了数值模拟,并和实验测量的数据进行了比较,结果表明它们的结果相一致。采用15 m长的多孔光纤可以获得约 10 nm的 3 dB调谐带宽,最大转换效率约为-16 dB,并且采用较低色散斜率值的多孔光纤可以进一步增大调谐范围。因此,利用多孔光纤可以实现紧凑的波长变换器。
By changing the core area, the diameter and distribution of the air holes in the porous optical fiber, it is possible to flexibly design its guided wave characteristics. The principle of wavelength conversion is analyzed by the coupled wave equation, and the relationship between the phase mismatch and the pump wavelength under the condition of fixed wavelength is discussed. The conversion efficiencies of parametric wavelength conversion based on porous optical fiber are numerically simulated and compared with the experimental data. The results show that their results are consistent. With a 15 m long porous fiber, a 3 dB tuning bandwidth of about 10 nm can be obtained with a maximum conversion efficiency of about -16 dB, and a porous optical fiber with a lower dispersion slope value can further increase the tuning range. Therefore, a compact wavelength converter can be realized using porous optical fiber.