多波长泵浦宽带拉曼放大器功率增益研究

Investigating the gain of multi-pumping broadband Raman amplifier

受激拉曼散射（ＳＲＳ）的Ｓｔｏｋｅｓ波谱线型比较复杂，本文分别采用Ｇａｕｓｓ线型和Ｌｏｒｅｎｔｚ线型，研究多波长泵浦宽带Ｒａｍａｎ放大器的增益特性，提出宽带增益平坦的多波长泵浦方案，研究表明增益平坦程度与泵浦波频率间隔密切相关。对Ｇ．６５２、Ｇ．６５３、Ｇ．６５５光纤和新型大有效面积非零色散平坦光纤的Ｒａｍａｎ放大增益分别进行了研究，结果表明Ｒａｍａｎ增益与光纤种类和光纤传输特性有关，特别是随光纤有效纤芯面积的增大而明显减小。

The Stokes spectrum in the stimulated Raman scattering (SRS) is very complicate. 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 ghd. Researching the Raman amplifiers based on G.652, G.653, G.655 fiber and laree effechve area non-zero dispersion fiattening fiber, we got that the Raman gain is associated with the fiber type and its transmission properties, especially decreasing with the effective core area increasing.