设计了一种三角形微结构光纤,利用全矢量有限元法对其模式特性进行了研究,发现此类光纤具有C3v对称性,共支持4类模式,基模为简并模式。对归一化空气孔直径d/Λ=0.986不变,空气孔直径d从10μm增大至16μm时和d=14μm不变,d/Λ分别为0.946,0.966,0.986时,光纤基模的色散特性和基模相位失配特性进行了研究。发现抽运光不变时,光纤结构参数的改变对斯托克斯波位置影响较大,但是反斯托克斯波长位置基本保持不变。利用中心波长为850 nm的飞秒激光抽运自制的双包层微结构光纤的外包层,进行了四波混频的实验研究,分别在1859 nm和551 nm处得到了斯托克斯和反斯托克斯信号,其中反斯托克斯波位置与理论计算结果仅相差3 nm,强度与剩余抽运波强度比值达到73。 A kind of triangular microstructured optical fiber is designed. The full-mode finite element method is used to study its mode characteristic. It is found that this type of fiber has C3v symmetry, supports 4 modes and the fundamental mode is degenerate mode. For the normalized air hole diameter d / Λ = 0.986 unchanged, air hole diameter d increased from 10μm to 16μm and d = 14μm unchanged, d / Λ were 0.946,0.966,0.986, the dispersion of optical fiber fundamental mode Characteristics and fundamental mode mismatch characteristics were studied. It is found that the change of fiber structure parameters has a great influence on the Stokes wave position when the pumping light is constant, but the anti-Stokes wavelength position remains basically unchanged. The outer cladding of the self-made double-clad microstructured fiber was pumped by a femtosecond laser with a center wavelength of 850 nm. Four-wave mixing experiment was carried out. At 1859 nm and 551 nm, Stokes and anti- Stokes signal. The position of anti-Stokes wave is only 3 nm away from the theoretical calculation result, and the ratio of intensity to residual wave strength reaches 73.