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Electrical and electronic engineering, Communication engineering and systems
We propose a novel optical coupling technique based on evanescent field coupling between a singlemode-multimode-singlemode (SMS) fiber structure and a long period fiber grating (LPFG). By parallel placement of the two fiber sections in close proximity to each other, the excited multi-cladding modes from the SMS fiber section can be selectively coupled to the guided mode in the LPFG, and vice versa. A theoretical analysis based for such a structure is undertaken and the simulated results are verified by experiments demonstrating a maximum coupling efficiency of up to 1.66% (which could be improved to 27.5% in theory) over a broadband resonance (42 nm with a 3 dB bandwidth).
Qiang, W., Semenova, Y., Ma, Y., Wang,P., Guo, T., Jin, L., Farrell, G. (2011) Light Coupling Between a Singlemode-Multimode-Singlemode (SMS) Fiber Structure and a Long Period Fiber Gating. Journal of Lightwave Technology, Vol.29, 24, 2011, pp.3683-3688. doi:10.1109/JLT.2011.2174140