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首页> 外文期刊>Applied optics >Effect of waist diameter and twist on tapered asymmetrical dual-core fiber MZI filter
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Effect of waist diameter and twist on tapered asymmetrical dual-core fiber MZI filter

机译：腰部直径和捻度对锥形不对称双芯光纤MZI滤波器的影响

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摘要

A compact in-fiber Mach-Zehnder interferometer (MZI) filter fabricated from custom-designed asymmetrical dual-core fiber is numerically analyzed in detail and experimentally verified. The asymmetrical dual-core fiber has core diameters and a core pitch of 6.9, 6, and 19.9 mu m, respectively. The fiber tapering technique is introduced to fuse the originally uncoupled cores into strong coupling tapered regions. The length and diameter of the waist region have a close impact on the splitting ratio, which further affects the spectral properties of the MZI filter. The field evolution with varied waist parameters is characterized by the finite element method and beam propagation method. Repeatable comb filters with similar to 15 dB extinction ratio are successfully achieved under the guidance of simulated optimum conditions. The twist-induced circular birefringence gives rise to a retardance that causes the spectral shifts of the MZI filter. The theoretical and experimental results confirm that the relative wavelength shift is proportional to the retardance, which follows a sinc function in the limit of a large twist rate. (C) 2015 Optical Society of America
机译：由定制设计的不对称双芯光纤制成的紧凑型光纤马赫曾德尔干涉仪（MZI）滤波器经过详细的数值分析和实验验证。非对称双芯光纤的纤芯直径和纤芯节距分别为6.9、6和19.9μm。引入了光纤渐缩技术，将最初未耦合的磁芯融合到牢固的耦合锥形区域中。腰部区域的长度和直径对分光比有密切影响，这进一步影响了MZI滤光片的光谱特性。腰部参数变化的场演化通过有限元法和束流传播法来表征。在模拟最佳条件的指导下，成功实现了具有类似于15 dB消光比的可重复梳状滤波器。扭曲引起的圆形双折射会引起延迟，从而引起MZI滤波器的光谱偏移。理论和实验结果证实，相对波长偏移与延迟成正比，在大扭曲速率的极限内，它遵循正弦函数。 （C）2015年美国眼镜学会

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