利用色散平坦渐减PCF产生宽带超连续谱  

Broadband Supercontinuum Generation in a Dispersion-flattened and Decreasing PCF

作　　者：徐永钊[1] 卫艳芬[2] 任晓敏[3] 

机构地区：[1]东莞理工学院电子工程系,广东东莞523808 [2]中国移动通信集团天津有限公司,天津300021 [3]北京邮电大学光通信与光波技术教育部重点实验室,北京100876

出　　处：《半导体光电》2009年第2期194-199,共6页Semiconductor Optoelectronics

基　　金：国家"973"计划项目(2003CB314906);教育部科学技术研究重大项目(104046)

摘　　要：结合光子晶体光纤(PCF)和拉锥的优点设计了一种色散平坦渐减PCF,用于在通信波段产生宽带超连续谱,并对该光纤中超连续谱的产生进行了详细的研究。结果表明:经过合理设计的PCF可以同时具有色散平坦和色散渐减的特性,并且其色散曲线沿光纤长度由反常色散区逐渐移动到正常色散区。这样的色散特性适合于产生宽带平坦的超连续谱。超连续谱形成的过程中以自相位调制效应为主,高阶非线性效应也起一定的作用,其中以拉曼散射效应的影响更为显著。另外,拉锥长度、光纤色散参量的渐减方式以及抽运脉冲的有效峰值功率和宽度对平坦超连续谱的产生均有着重要的影响。A dispersion-flattened and decreasing photonic crystal fiber（PCF） is designed by combining the advantageous properties of PCF and tapering for generating broadband supercontinuum in telecommunication windows, and supercontinuum generation in this fiber is analyzed in detail. The results show that by appropriately designing the fiber, the PCF can achieve flattened chromatic dispersion which also gradually moves from anomalous dispersion to normal dispersion with fiber length. The fiber characterized by those dispersion properties is suitable for flat wideband supercontinuum generation. In the process of spectral broadening, self- phase modulation plays a dominant role, and stimulated Raman scattering has more significant influence on supercontinuum generation than other higher-order nonlinear effects. It is also found that the tapered length, the way of the dispersion decreasing, the peak power and the pulse width of the pump pulse are crucial to flat broadband supereontinuum generation.

关 键 词：光纤光学 光子晶体光纤 色散渐减 超连续谱 

分 类 号：TN252[电子电信—物理电子学]