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Numerical analysis of modal instability onset in fiber amplifiers

机译:光纤放大器模态不稳定性开始的数值分析

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Numerical analysis of the onset of modal instability in fiber amplifiers is presented. Specifically calculations of the evolution of the intensity fluctuation spectrum along the fiber for a sampling point offset from the core center are presented for different instability onset conditions. These include seeding with LP01 only, seeding with LP01 and LP11 at the same frequency, seeding with LP01 and LP11 at offset frequencies, and seeding taking quantum shot noise into account. The position dependent spectra are shown to be very similar for each of these cases suggesting a common instability mechanism.
机译:给出了光纤放大器模态不稳定性发生的数值分析。针对不同的不稳定性起始条件,提出了针对从纤芯中心偏移的采样点沿光纤强度波动谱的演化的具体计算方法。其中包括仅以LP01进行播种,以相同频率进行LP01和LP11播种,以偏移频率进行LP01和LP11播种以及考虑到量子散粒噪声的播种。在每种情况下,位置相关的光谱都非常相似,这表明存在共同的不稳定机制。

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