掺铒非线性光纤环镜中增益带宽对超短光孤子放大的影响  

Effect of gain bandwidth on the amplification of ultrashort soliton in an erbium-doped nonlinear amplifying fiber loop mirror

作　　者：雷大军[1] 傅喜泉[2] 姚敏[1] 董辉[1] 

机构地区：[1]湘南学院物理系,湖南郴州423000 [2]湖南大学计算机与通信学院,长沙410082

出　　处：《光通信技术》2007年第1期43-46,共4页Optical Communication Technology

基　　金：国家自然科学基金(10576012)资助;湖南省教育厅资助科研项目;湘南学院科学研究项目(06Q003)资助

摘　　要：根据宽带脉冲的特点,建立了描述宽带脉冲放大的理论模型,并同时用数值方法研究了超短孤子在掺铒非线性光纤环镜中的放大。计算结果表明,当输入脉冲的频谱宽度和增益带宽相接近时,超短光孤子的波形和频谱产生畸变,放大效率降低,使得输出脉冲不再具有孤子特性。而这种影响可以通过优化不同增益带宽的ED-NALM中环的长度来消除。Based on the character ofultrabroad bandwidth pulse, a modified nonlinear Schr？dinger equation describing the amplification of ultrabroad bandwidth pulse in ED-NALM is derived. We studied the amplification of ultrashort soliton in ED-NALM numerically. It is shown that when the bandwidth of soliton is comparable to the gain bandwidth of ED-NALM, the amplifier will distort the pulse spectrum and limit the efficiency of amplification. The distortion can be overcome by optimize the loop lengths of ED-NALM for different gain bandwidth.

关 键 词：光纤放大器 脉冲放大 脉冲压缩 孤子 

分 类 号：TN253[电子电信—物理电子学]