Abstract
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).
© 2011 IEEE
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