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首页> 外文期刊>Optics Letters >Design principles of multifiber resonant directional couplers with hollow Bragg fibers: example of a 3 X 3 coupler
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Design principles of multifiber resonant directional couplers with hollow Bragg fibers: example of a 3 X 3 coupler

机译：空心布拉格纤维的多纤谐振定向耦合器的设计原理：3 X 3耦合器示例

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When several hollow photonic crystal fibers (HPCFs) are placed in proximity to each other, radiation-induced interfiber coupling between their core guided modes is observed. Under certain conditions coupling between the core modes of two touching collinear fibers can have a resonant increase via excitation of a low-quality intermirror cavity resonant state. Such coupling, however, decreases dramatically within the first micrometer of intermirror separation. Moreover, when fibers are touching, in the frequency domain a large number of accidental degeneracies with fiber surface and mirror states complicate the design of a stable 2 X 2 coupler. To alleviate these problems we consider coupling among three hollow Bragg fibers. When placed in the vertices of an isosceles triangle, even for a finite separation between fibers, triangular interfiber cavity forms a high-quality resonator that can be tuned via additional structural elements to a particular frequency of interest. Interfiber surface states are suppressed by keeping the fiber separation finite, thus allowing stable coupling conditions in a 3 X 3 HPCF coupler configuration.
机译：当几根中空光子晶体光纤（HPCF）彼此靠近放置时，可以观察到它们的纤芯导模之间的辐射诱导的光纤耦合。在某些条件下，两条接触的共线光纤的纤芯模式之间的耦合会通过激发低质量的镜间谐振腔共振态而产生共振增加。然而，这种耦合在镜间分离的第一微米内急剧减小。此外，当光纤接触时，在频域中，具有光纤表面和镜面状态的大量意外退化会使稳定的2 X 2耦合器的设计复杂化。为了减轻这些问题，我们考虑了三根中空布拉格纤维之间的耦合。当放置在等腰三角形的顶点上时，即使对于纤维之间的有限间隔，三角形的纤维间腔也会形成高质量的谐振器，可以通过附加的结构元件将其调谐到特定的关注频率。通过保持有限的纤维间距来抑制纤维间表面状态，从而在3 X 3 HPCF耦合器配置中提供稳定的耦合条件。

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