Othman N, Shah N S M, Tay K G, Pakarzadeh H, Cholan N A
Appl Opt. 2017 Oct 10;56(29):8303-8308. doi: 10.1364/AO.56.008303.
The impact of random dispersion fluctuations on the gain and saturation behavior of a one-pump fiber optical parametric amplifier (1-P FOPA) in the presence of fourth-order dispersion coefficient (β) is investigated. Three coupled amplitude equations with fiber losses are solved numerically for the calculation of the pump, signal, and idler. The performances of 1-P FOPA are also analyzed with variation of dispersion fluctuation amplitude (σ) and correlation length (L). Based on the numerical results, it is found that the gain spectra and saturation curves exhibit some differences when β is considered. In comparison with the case where β is ignored, the peak gain remains the same, but the 3 dB bandwidth increases when β exists. Another notable difference is that the saturation power is shifted to lower or higher values, depending on the σ and L parameters. In general, the peak gain reduces as σ increases, and the peak gain reduction is greater for the case of shorter L. The numerical analysis is probably useful, especially for the case where the signal wavelength is detuned far from the pump wavelength.
研究了在存在四阶色散系数（β）的情况下，随机色散涨落对单泵浦光纤光学参量放大器（1-P FOPA）增益和饱和特性的影响。求解了包含光纤损耗的三个耦合振幅方程，以计算泵浦光、信号光和闲频光。还分析了1-P FOPA在色散涨落幅度（σ）和相关长度（L）变化时的性能。基于数值结果发现，考虑β时增益谱和饱和曲线呈现出一些差异。与忽略β的情况相比，峰值增益保持不变，但存在β时3 dB带宽增加。另一个显著差异是，饱和功率会根据σ和L参数向更低或更高的值偏移。一般来说，峰值增益随σ增加而降低，且对于较短L的情况，峰值增益降低更大。该数值分析可能是有用的，特别是对于信号波长远离泵浦波长失谐的情况。
