Coupling between core and cladding modes in a helical core fiber with large core offset

被引:17
作者
Napiorkowski, Maciej [1 ]
Urbanczyk, Waclaw [1 ]
机构
[1] Wroclaw Univ Technol, Dept Opt & Photon, Wybrzeze Wyspianskiego 27, PL-50370 Wroclaw, Poland
关键词
twisted optical fibers; helical-core fibers; rigorous simulations; transformation optics; ORBITAL-ANGULAR-MOMENTUM; RIGOROUS SIMULATIONS;
D O I
10.1088/2040-8978/18/5/055601
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We analyzed the effect of resonant coupling between core and cladding modes in a helical core fiber with large core offset using the fully vectorial method based on the transformation optics formalism. Our study revealed that the resonant couplings to lower order cladding modes predicted by perturbative methods and observed experimentally in fibers with small core offsets are in fact prohibited for larger core offsets. This effect is related to the lack of phase matching caused by elongation of the optical path of the fundamental modes in the helical core. Moreover, strong couplings to the cladding modes of the azimuthal modal number much higher than predicted by perturbative methods may be observed for large core offsets, as the core offset introduces higher order angular harmonics in the field distribution of the fundamental modes. Finally, in contrast to previous studies, we demonstrate the existence of spectrally broad polarization sensitive couplings to the cladding modes suggesting that helical core fibers with large core offsets may be used as broadband circular polarizers.
引用
收藏
页数:9
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