Title :
Light Coupling Between a Singlemode- Multimode-Singlemode (SMS) Fiber Structure and a Long Period Fiber Grating
Author :
Wu, Qiang ; Semenova, Yuliya ; Ma, Youqiao ; Wang, Pengfei ; Guo, Tuan ; Jin, Long ; Farrell, Gerald
Author_Institution :
Photonics Res. Center, Dublin Inst. of Technol., Dublin, Ireland
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).
Keywords :
diffraction gratings; optical fibre couplers; evanescent field coupling; light coupling; long period fiber grating; optical coupling technique; singlemode multimode singlemode fiber structure; Couplings; Optical fiber communication; Optical fiber couplers; Optical fiber theory; Optical switches; Refractive index; Long period grating; SMS fiber structure; optical coupler; optical switch;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2011.2174140
