掺杂和结构对光纤中去极化型声波导布里渊散射频移与散射效率的影响

Effects of Doping and Structureon Brillouin Frequency Shift and Scattering Efficiency of Depolarized Guided Acoustic Wave in Fibers

利用全矢量有限元法研究了单模光纤及光子晶体光纤中掺杂材料及浓度、光纤结构对去极化型声波导布里渊散射频移和散射效率的影响.结果表明增大包层掺氟浓度或纤芯掺锗浓度均会减小光纤布里渊频移,也会增大单模光纤散射效率.光子晶体光纤中整体掺氟浓度不变时,空气孔层数的增加会减小布里渊频移;而纤芯掺锗浓度不变时,随空气孔层数的增加TR2,3模式的布里渊频移增大,而TR2,7模式的布里渊频移减小.

The effects of the doping material, concentration and fiber structure on the frequency shift and Brillouin scattering efficiency of depolarized guided acoustic wave Brillouin scattering in single mode fiber and photonic crystal fiber are investigated by the all-vector finite element method. The results show that the Brillouin frequency shift of the two kinds of fibers decrease and scattering efficiency of the single mode fiber increase with the increase of doped F concentrationin the cladding and doped GeO2 concentrationin the core. The Brillouin frequency shift decreases with the increasing number of air holes rings at the given doped F concentration in photonic crystal fiber. The Brillouin frequency shift of TR2.5 mode increases, but that of TR2.7 modedecreases with the increasing number of air holes rings at a given doped GeO2 concentration in fiber core.