The impact of elliptical deformations for optimizing the performance of dual-core fluorine-doped photonic crystal fiber couplers.
The impact of elliptical deformations for optimizing the performance of dual-core fluorine-doped photonic crystal fiber couplers.
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DOI：
10.1364/oe.14.001982
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发表时间：
2006-03
期刊：
影响因子：
3.8
通讯作者：
S. Varshney;N. Florous;K. Saitoh;M. Koshiba
中科院分区：
文献类型：
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作者：
S. Varshney;N. Florous;K. Saitoh;M. Koshiba
为了优化双芯掺氟光子晶体光纤(PCF)耦合器的耦合特性，本文研究了包层气孔和椭圆调制纤芯等椭圆变形特性对耦合特性的影响。我们用试错法对掺氟光子晶体光纤耦合器的传输特性进行了详细的数值研究。新提出的PCF耦合器结构的典型特征是：在0.7微米到1.6微米的波长范围内具有波长平坦的耦合特性，从0.9微米到1.6微米的耦合效率为50+/-1%，并且合理的较小的耦合长度为1.3厘米。此外，我们还详细推导了设计参数，使得我们提出的双芯光子晶体光纤耦合器具有偏振不敏感的特性，并用全矢量光束传输方法进行了验证。所提出的双芯PCF可以在很宽的波长范围内有效地用作3dB耦合器。
In this paper we study the impact of elliptically-deformed features such as cladding air-holes and elliptically-modulated cores, as ingredients for optimizing the coupling characteristics of dual-core fluorine-doped photonic crystal fiber (PCF) couplers. We provide a detailed numerical investigation by using a trial and error approach for optimizing the propagation characteristics of fluorine-doped PCF couplers. Typical characteristics of the newly proposed PCF coupler structure are: wavelength-flattened coupling characteristics between 0.7 mum and 1.6 mum wavelength range, coupling efficiency of 50+/-1 % from 0.9 mum to 1.6 mum, and a reasonably small coupling length of 1.3 cm. In addition we have elaborately derived the design parameters so that our proposed dual-core PCF coupler exhibits polarization-insensitive characteristics verified by using a full-vectorial beam propagation method. The proposed dual-core PCF can be effectively used as a 3-dB coupler, over a wide wavelength range.