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利用一组耦合方程,在理论上推导出了双抽运、三段光纤级联结构的参量放大器的增益表达式。研究表明在双抽运情况下,光纤参量放大器(FOPA)的增益随光纤长度、抽运光功率的增加而变大;同时,增益的大小和平坦性能也受到光纤色散特性的影响,从反常色散区到正常色散区,增益带宽逐渐变小,增益不平坦性有一定的改善;在二阶色散系数不变的情况下,光纤参量放大器增益带宽随四阶色散数的增加而减小。采用多段光纤级联结构,可以均衡光纤参量放大器增益的不平坦性。
Using a set of coupled equations, the gain expressions of parametric amplifiers with double-pump and triple-stage fiber cascades are theoretically deduced. The results show that the gain of fiberoptic parametric amplifier (FOPA) increases with the increase of fiber length and pumping power under the condition of double pumping, meanwhile, the gain and flatness are also affected by the dispersion characteristics of the fiber, When the second-order dispersion coefficient is constant, the gain bandwidth of the fiber parametric amplifier decreases with the increase of the fourth-order dispersion number. The multi-stage optical fiber cascade structure can balance the unevenness of the gain of the fiber parametric amplifier.