双包层As2Se3硫化物光子晶体光纤受激布里渊散射慢光

研究了双包层As₂Se₃硫化物光子晶体光纤内、外包层结构对受激布里渊散射慢光特性的影响.在分析双包层As₂Se₃硫化物光子晶体光纤结构对布里渊增益谱的影响时,考虑了声场的高阶模式.研究结果表明,内包层占空比的变化对慢光特性影响较大,随内包层占空比的增加,布里渊增益谱的主峰逐渐降低,第二个峰值逐渐上升,时间延迟量增加,布里渊增益的变化趋势与其相似.但这些特性受外包层占空比的变化影响较小,布里渊增益谱的第二个峰值略微上升,而时间延迟及增益变化很小.因此双包层As₂Se₃硫化物光子晶体光纤的慢光特性受内包层占空比影响较大.而与内包层相比,这些特性受外包层占空比的影响较小.

Stimulated Brillouin scattering slow light in double-clad As2Se3 chalcogenide photonic crystal fibers

The influence of the structure of the inner/outer cladding on the slow light characteristics of Brillouin scattering in double-clad As₂Se₃ chalcogenide photonic crystal fiber is investigated in this paper. In this study, the high-order mode of the sound field is considered when analyzing the influence of the structure of double-clad As₂Se₃ chalcogenide photonic crystal fiber on the Brillouin gain spectrum. The results coming out from our studies show that the air filling fraction of inner cladding has a great influence on the slow light characteristics. With the increase of the air filling fraction of inner cladding, the main peak of Brillouin spectrum decreases gradually, the second peak increases gradually, and also the time delay increases as a result. The trend of Brillouin gain is similar. The above characteristics are less affected by the change of the air filling fraction of the outer layer. The second peak of the Brillouin gain spectrum rises slightly, while the time delay and gain change are still small. It can be seen that the slow light characteristics of the dual-cladding As₂Se₃ sulphide photon crystal fiber are greatly controlled by the air filling fraction of the inner cladding, and these characteristics are less affected by the air filling fraction of the outer layer if compared with the inner cladding.