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Opt Express. 2007 May 14;15(10):6494-9.

Symmetric 3 x 3 optical coupler using three parallel long-period fiber gratings.

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  • 1Department of Electronic Engineering, City University of Hong Kong, Hong Kong, China. eeyqliu@cityu.edu.hk


We propose a new technique of realizing a symmetric 3 x 3 optical coupler, which is based on evanescent-field coupling among three identical parallel long-period fiber gratings placed side-by-side. Using three 32-mm-long over-coupled long-period fiber gratings embedded in a medium with a proper refractive index, we achieved equal power outputs from the three fibers at the resonance wavelength of the gratings with a total loss of about 1.4 dB when light was launched into any one of the fibers.

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