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arXiv 1011.2691physics.optics
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高度局域化光纤光栅中包层模耦合的模式特性和透射谱

Cladding mode coupling in highly localized fiber Bragg gratings: modal properties and transmission spectra

Jens Thomas, Nemanja Jovanovic, Ria G. Becker, Graham D. Marshall, Michael J. Withford, Andreas Tünnermann, Stefan Nolte, M. J. Steel

摘要:

横向非均匀折射率光纤光栅的光谱特性与横向均匀折射率光纤光栅的光谱特性有很大的不同。研究了聚焦超短脉冲记录的非均匀和非对称光纤光栅的透射谱。这种FBG的包层模式谐振可以跨越频谱中的整个倍频程,并且非常明显(比20dB更深)。使用耦合模式的方法,我们计算的共振耦合的强度,发现更高的方位角阶的包层模式的耦合是非常敏感的修改在核心中的位置。利用这些特性可以精确控制这种反射,并可能导致许多新的传感应用。

英文摘要:

The spectral characteristics of a fiber Bragg grating (FBG) with a transversely inhomogeneous refractive index profile, differs con- siderably from that of a transversely uniform one. Transmission spectra of inhomogeneous and asymmetric FBGs that have been inscribed with focused ultrashort pulses with the so-called point-by-point technique are investigated. The cladding mode resonances of such FBGs can span a full octave in the spectrum and are very pronounced (deeper than 20dB). Using a coupled-mode approach, we compute the strength of resonant coupling and find that coupling into cladding modes of higher azimuthal order is very sensitive to the position of the modification in the core. Exploiting these properties allows precise control of such reflections and may lead to many new sensing applications.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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