掺杂光子晶体光纤的缺陷模增益谱与光孤子拉曼放大研究  

Research on Gain of Doped Photonic Crystal Fiber with Raman Amplification of Soliton

作　　者：沈廷根[1] 郑浩[1] 李正华[2] 方云团[2] 

机构地区：[1]江苏大学物理系,镇江212003 [2]镇江船艇学院基础系

出　　处：《人工晶体学报》2005年第6期1065-1073,共9页Journal of Synthetic Crystals

基　　金：江苏省自然科学基金(BK2004059)资助项目

摘　　要：本文研究在层状结构光子晶体光纤中引入多个缺陷区,制作出多芯的光子晶体光纤,在光子晶体光纤中增加的多个线缺陷形成波分复用技术的多个传输信道,在此基础上数值模拟研究在缺陷介质中掺入和未掺入激活杂质,光子晶体光纤的掺杂局域场特征以及受激辐射增强和透射率大于1现象与光子带隙内群速度异常和掺杂层复有效折射率负的虚部之间的内在规律,进一步研究发现在光子晶体光纤的各个线缺陷中掺入拉曼增益介质,得到光子晶体光纤拉曼放大规律。由于光子晶体光纤的各个信道间存在带隙,使得信道间信号串扰必然受到抑制,利用这些特性可以设计分布式高增益、极低噪声、宽带和有利于光集成的新型光子晶体光纤拉曼放大器,将它用于密集波分复用(DWDM)光通信系统。We study the characteristics of multicore photonic crystal fiber with layered structure made of several defect regions in this article and found that the line defects in the photonic crystal fiber can act as transmission channels in the wavelength-division multiplexing （WDM） communication systems. By numerical simulation, we found the relationships between the characteristics of the localized field, the transmittivity being greater than one and the negative imaginary component of complex refractive index of doped layers with the active impurity. In addition, the study also shows the characteristics of Raman amplification from the photonic crystal fiber with each of its line defects doped with Raman gain media. The Crosstalk among the signals must be suppressed because there exist band gaps among the channels of photonic crystal fiber. Taking advantage of these characteristics of the structure, we can design Raman optical amplifiers with performance of distributed high gain, extremely low noise, etc. , which may provide an ideal method to amplify signals in the super dense wavelength-division multiplexing （DWDM） communication systems.

关 键 词：光子晶体光纤透射谱 信道间串扰 拉曼增益 

分 类 号：O782[理学—晶体学]