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在考虑辐致损耗的条件下，提出了单频单模光纤放大器功率极限理论模型，并基于该模型分析了辐致损耗对于单频单模掺镱光纤放大器功率提升的影响。研究结果表明：辐致损耗不仅会导致放大器功率极限的迅速下降，还使得功率极限仅能够在特定光纤直径和光纤长度下实现。通过解析推导功率极限表达式，发现：辐致损耗的影响，与无辐照条件下的光纤最佳长度有关，缩小无辐照条件下的光纤最佳长度可以弱化辐致损耗对于功率极限的影响。研究还表明：针对特定目标功率，辐致损耗的增加，会导致光纤直径和光纤长度的选取范围缩小；不过，泵浦光亮度和吸收系数的提升，有利于拓宽光纤长度和光纤直径的取值范围，对于辐致损耗的影响有一定的抑制效果。本文的理论模型及研究结果对于辐照环境中单频单模光纤放大器的研究及应用具有指导意义。Power scalability of single-frequency single-mode Yb-doped fiber amplifiers is significant for their applications. Considering their potential applications in radiation environments, the influence of radiation-induced attenuation (RIA) on the power scalability of signal-frequency single-mode Yb-doped fiber amplifiers is studied in this work.
By giving the powers limited by pump brightness, stimulated Brillion scattering (SBS) and transverse mode instability (TMI), the theoretical model predicting the power limit of single-frequency single-mode Yb-doped fiber amplifiers is presented with the consideration of RIA. It is revealed that RIA cannot only lower the power limit seriously, but can also make the achievement of power limit more difficult. The analytic formula of power limit is deduced. It is found that the effect of RIA on the power limit is mainly determined by the optimum length with no RIA. It is suggested that the reduction of power limit caused by RIA can be weakened by shortening the optimum length of Yb-doped fiber.
The requirement on Yb-doped fiber for achieving certain target power is also discussed and the needed ranges of core diameter and fiber length are given analytically. It is found that the RIA will enhance the difficulty for achieving the target power by limiting the option of Yb-doped fibers. In spite of that, it is also found that such effect of RIA can be weakened by increasing the core absorption coefficient and pump brightness.
Moreover, the numerical model and pertinent formula can also reveal the effect of radiation dose by fitting the relationship of RIA and radiation dose with the empirical expressions such as Power-law. They can provide significant guidance on the designing and applications of single-frequency single-mode Yb-doped fiber amplifiers in radiation environments.-
Keywords:
- fiber amplifier /
- radiation effect /
- transverse mode instability /
- stimulated Brillouin scattering
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