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随着高输出功率掺铒光纤放大器和高非线性光纤的出现和使用 ,光纤参变放大器 (OPAs)中出现了越来越多的增益饱和现象 ,这是光放大器中应该尽量避免的。对此 ,提出了依据光纤参变放大器的光纤非线性系数、抽运光功率、信号输入功率等参量对光纤长度进行优化设计的解决思路。明确提出最佳光纤长度的概念 ,即在其他参量一定的情况下使信号增益或信号输出功率达到最大所需的最小光纤长度 ,而且最佳光纤长度有利于提高光纤参变放大的增益带宽和波长转换带宽。通过数值积分求解描述光纤参变放大过程的非线性耦合方程 ,并运用控制变量法深入研究了最佳光纤长度与光纤非线性系数、抽运光功率、信号输入功率的关系。最后用最小二乘法进行数据拟合确定系数 ,得到简洁、实用的最佳光纤长度解析表达式。与已有实验结果比较表明 ,该解析式可很好地用来计算和优化光纤参变放大的光纤长度。
With the emergence and use of high output power erbium-doped fiber amplifiers and high-nonlinearity fibers, more and more gain saturation phenomena appear in optical parametric amplifier (OPAs), which should be avoided in optical amplifiers. In view of this, the solution of optimizing the length of optical fiber based on the parameters of non-linearity of optical fiber, pump power and signal input power is proposed. The concept of optimum fiber length is clearly defined as the minimum fiber length required to maximize the signal gain or signal output power under certain other conditions and the optimal fiber length contributes to improved fiber gain gain gain bandwidth and wavelength Convert bandwidth. The numerical integration is used to describe the nonlinear coupling equation describing the optical parametric amplification and the relationship between the optimum optical fiber length and the optical fiber nonlinear coefficient, pump light power and signal input power is deeply studied by the control variable method. Finally, the least square method was used to determine the coefficients by fitting the data, and the concise and practical optimal fiber length analytical expression was obtained. Compared with the existing experimental results show that the analytic formula can be used to calculate and optimize the optical fiber to change the amplified optical fiber length.