多波长抽运宽带光纤拉曼放大器的数值模拟与优化

采用平均功率分析算法对多波长抽运宽带光纤拉曼放大器进行了细致的数值模拟 ,并根据多抽运拉曼增益谱的特点和不同抽运波长对增益斜率的不同影响提出了一种新的有效的抽运优化算法。并利用这种方法对 10波长抽运的光纤拉曼放大器进行了优化 ,获得了 70nm带宽上增益谱波动低于 0 .5dB的结果。

多波长抽运光纤拉曼放大器的增益平坦研究

对多波长抽运增益平坦拉曼光纤放大器设计中需考虑的重要问题进行分析,包括光纤类型差异和掺杂浓度对拉曼增益系数的影响等,并通过数值计算得到了不同波长抽运光随光纤长度的演变情况,进而给出了多波长抽运情况下抽运波长的选择方法,估算了抽运光的所需能量。

反向多波长抽运RFA的稳定高效的打靶算法

基于求解非线性方程组的牛顿拉斐森方法,提出了一种反向多波长抽运拉曼光纤放大器(BMP RFA)数学模型的打靶算法。通过对实际应用条件下多种参数BMP RFA数学模型的求解,表明该算法是高效和稳定的。采用该算法对波长分别为1 420 nm、1 440 nm、1 460 nm、1 480 nm和1 500 nm,功率均为220 mW的5个抽运光源,波长为1 530.33 nm^1 611.79 nm、信道间隔为100 GHz的ITU建议的C+L波段100路信号光,20 km标准单模光纤作为增益介质的BMP RFA进行数值仿真,结果仅迭代4次就使5个抽运光源中最大的功率偏差降为0.3 mW。

Investigation on the Gain of Multi wavelength Pumping Broadband Raman Amplifier

The Stokes spectrum in the stimulated Raman scattering (SRS) is very complicated. In this article, we use both Gaussian and Lorentz approximation to investigate the gain properties of multi pumping broadband Raman amplifier, and present some schemes for flattening the gain. All the results show that the flatness of the gain spectrum is closely related to the pumping frequency grid. By researching the gain properties of Raman amplifiers of such ITU-T fibers as G.652, G.653, G.655 and large effective area non zero dispersion flattening fiber, we find that the Raman gain is associated with the fiber type and its transmission characteristics, especially it decreases with the increase of the effective core area.