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Hollow Bragg fiber bundles: when coupling helps and when it hurts

机译:中空布拉格纤维束:何时有帮助,何时有伤害

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摘要

Coupling between leaky modes of collinear hollow-core Bragg fibers is considered. It is found that coupling is unusually strong because of resonant effects in the interfiber cavity when the fibers are touching each other and decreases dramatically with the first tens of nanometers of fiber separation. However, residual coupling with a strength proportional to the fiber radiation loss is long range, decreasing as an inverse square root of the interfiber separation and exhibiting periodic variation. The possibility of building a directional coupler from touching Bragg fibers is discussed in view of the findings.
机译:考虑了共线空心布拉格纤维的泄漏模式之间的耦合。已经发现,耦合是异常强的,因为当纤维彼此接触时,在纤维间腔中会产生共振效应,并且在纤维分离的前几十纳米中会急剧降低。然而,具有与纤维辐射损耗成比例的强度的残余耦合是长距离的,作为纤维间分离的平方根的倒数而减小,并表现出周期性变化。鉴于上述发现,讨论了通过接触布拉格光纤来构建定向耦合器的可能性。

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