Analysis and simulation of an all-fiber polarization transformer
Analysis and simulation of an all-fiber polarization transformer
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DOI：
10.1117/12.783787
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发表时间：
2007-12
期刊：
影响因子：
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通讯作者：
Zhi-dong Shi;Min-Ning Ji;Jian-qiang Lin;Huan Bao;Shu Liu
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文献类型：
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作者：
Zhi-dong Shi;Min-Ning Ji;Jian-qiang Lin;Huan Bao;Shu Liu
在分析可变耦合模方程的基础上，提出了一种最佳的变旋速率Q(Z)=0.5tan{arcsin[(z/L)sin(arctan2q(L)]}，其中Q(Z)为沿光纤长度L的拍长Lb归一化的旋转率。然后，根据全光纤偏振变压器的固有结构，考虑到相位差的影响，计算了沿光纤点对点的琼斯矢量，模拟了偏振态在光纤中的演化过程。为了进行比较，还对AFPT制造过程中常用的另外两种旋转率分布(线性、余弦)进行了计算。详细讨论和比较了自旋速率变化曲线对AFPT偏振变换性能的影响。结果表明，无论是在要求输出光的消光比尽可能小的线性输入/圆形输出的情况下，还是在要求输出光的消光比尽可能大的情况下，具有最优自旋速率分布的AFPT都具有最好的性能，而线性自旋速率分布是最差的。分析和计算结果对AFPT样品的设计、制作和评估具有参考价值。
Based on the analysis on the variable coupled-mode equation, we proposed an optimal profile of variably spun rate Q(z) = 0.5tan{arcsin[(z/L)sin(arctan2Q(L)]} to get better performance for all-fiber polarization transformer (AFPT), where Q(z) is normalized spun rate by beat length LB along the fiber length L. Then, in accordance with the intrinsic structure of AFPT, and in consideration of considering the phase-difference effect, we calculated the Jones vector from point to point along fiber to simulate the evolution of state of polarization (SOP) in AFPT with this optimal spun rate profile. For comparison, calculations are also made with other two kinds of spun rate profile (linear, cosine) often used in the AFPT fabricating process. The Influence of spun rate variation profile on the polarization transforming performance of AFPT is discussed and compared in detail. It is found that both in the case of linear-in/circular-out where the extinction ratio of output light is required as small as possible and in the case of circular-out/linear-in where the extinction ratio of output light is required as large as possible, the AFPT with optimal spun-rate profile presents best performance, and the linear spun-rate profile is the worst. The analysis and calculation results have referential values to the design, fabrication and evaluation of AFPT samples.