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Tunable photonic devices using microstructured optical fibers.

机译：使用微结构光纤的可调光子器件。

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摘要

Microstructured optical fibers display unique optical capabilities for manipulating light. These fibers, typically all-silica, incorporate numerous airholes that run along the length of the fiber in the cladding region. By gaining insight into the properties of these modes, we demonstrate fiber designs whose characteristics are unique and provide a platform for future photonic devices. By introducing certain materials into the airholes and by engineering the fiber, it is possible to actively manipulate light, creating the potential for novel hybrid all-fiber optical devices in which tunability is incorporated into the fiber itself.; To manipulate light propagating in the microstructured optical fiber, an efficient interaction between the field and tunable materials infused in the airholes is required. This interaction can be achieved by creating sections along the fiber where the optical mode field is sensitive to the presence of active materials. One way is to spread the mode field out of the core and into the cladding by tapering the fiber. The mode field then interacts with the airholes and its guiding properties become sensitive to materials infused into the airholes and along the tapered section. The other method involves coupling the core and cladding modes using a grating written in the core of the fiber. The cladding modes have their field distribution in the cladding and therefore are sensitive to any change in the cladding/airhole interface.; To obtain tunability, materials such as polymers with a temperature dependent refractive index or microfluids are incorporated into the airholes of the microstructured optical fiber. Tunability is achieved by changing the refractive index of the polymer or by displacing the microfluids along the airholes to certain locations where overlap with the mode field occurs.; In this work, devices such as tunable filters and attenuators, based on the dynamic position of fluids along the length of the fiber or on local changes of the refractive index of polymers are demonstrated. Tunable polarizers are also achieved by introducing active materials into specific airholes to break the symmetry of the waveguide. One may tune the asymmetry by changing the index of the material (polymer) or displacing the material (micro-fluid) along the fiber. Further, gratings formed by periodic structures introduced in the airholes of the microstructured optical fiber are described in the context of tunable filters.
机译：微结构光纤显示出独特的光学性能，可用于操纵光。这些光纤（通常为全石英）在包层区域内沿光纤的长度分布着许多气孔。通过深入了解这些模式的特性，我们演示了具有独特特征的光纤设计，并为未来的光子器件提供了平台。通过将某些材料引入气孔并通过对光纤进行工程处理，可以主动地操纵光，从而为将可调谐性结合到光纤本身中的新型混合全光纤光学设备创造了潜力。为了操纵在微结构光纤中传播的光，需要在场和注入气孔中的可调材料之间进行有效的相互作用。可以通过沿着光纤创建其中光学模式场对活性材料的存在敏感的部分来实现这种相互作用。一种方法是通过使光纤逐渐变细，将模式场从纤芯扩展到包层。然后，模场与气孔相互作用，并且其引导特性对注入气孔并沿着锥形部分的材料变得敏感。另一种方法涉及使用写入光纤纤芯中的光栅耦合纤芯和包层模式。包层模式在包层中具有其场分布，因此对包层/气孔界面的任何变化敏感。为了获得可调性，将诸如具有与温度有关的折射率的聚合物或微流体之类的材料结合到微结构化光纤的气孔中。可调节性是通过改变聚合物的折射率或通过将微流体沿着气孔移动到与模场重叠的某些位置来实现的。在这项工作中，基于流体沿着纤维长度的动态位置或聚合物折射率的局部变化，展示了诸如可调谐滤波器和衰减器之类的设备。通过将活性材料引入特定的气孔以破坏波导的对称性，也可以实现可调谐的偏振器。可以通过改变材料（聚合物）的折射率或沿纤维移动材料（微流体）来调整不对称性。此外，在可调谐滤波器的背景下描述了由引入微结构化光纤的气孔中的周期性结构形成的光栅。

著录项

  • 作者

    Kerbage, Charles.;

  • 作者单位

    Columbia University.;

  • 授予单位 Columbia University.;
  • 学科 Physics Optics.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 182 p.
  • 总页数 182
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 光学;
  • 关键词

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