理論研究了小芯徑光子晶體光纖中基于前向受激布里淵散射的快光.利用前向受激布里淵散射三波耦合方程,通過(guò)傅里葉變換,計(jì)算小芯徑光子晶體光纖中的群折射率和增益系數(shù).用有限元法模擬了聲場(chǎng)和光場(chǎng)的分布、信號(hào)光時(shí)間提前量和展寬因子.小芯徑光子晶體光纖中光場(chǎng)與聲場(chǎng)可以有效地重疊在纖芯中,增強(qiáng)了它們之間的非線(xiàn)性相互作用,導(dǎo)致強(qiáng)的受激布里淵散射和大的時(shí)間提前量.隨著信號(hào)光傳輸距離的增加,時(shí)間提前量成非線(xiàn)性增長(zhǎng),與此同時(shí),信號(hào)光被壓縮.隨著初始脈沖的增大,脈沖展寬因子逐漸趨于平穩(wěn).當(dāng)傳輸距離為70 m,初始脈沖寬度為200 ns,泵浦功率為600 mW,計(jì)算出時(shí)間提前量為21.76 ns和脈沖展寬因子為0.77. 

【文章來(lái)源】：光子學(xué)報(bào). 2020,49(07)北大核心EICSCD

【文章頁(yè)數(shù)】：8 頁(yè)

【文章目錄】：
0 Introduction
1 Theory
    1.1 The FSBS fast light
    1.2 The FSBS acoustic field
2 Numerical simulation
    2.1 The proposed small-core PCFs
    2.2 The optical and acoustic field distribution
    2.3 The gain coefficient,refractive index and group index with the frequency
    2.4 Time advancement of the fast light
    2.5 Distortion of optical pulses induced by the fast light
    2.6 The normalized waveforms of output
3 Conclusion



本文編號(hào)：3361116