Design of wavelength tunable long-period grating couplers based on asymmetric nonlinear dual-core fibers.
We demonstrate a grating coupler using an asymmetric nonlinear dual-core fiber with a pair of long-period gratings (LPGs). Simple formulas for the achievement of 100% coupling efficiency and small sidelobes are derived. The passband exhibits steep band transitions. By launching high-intensity optical pumps to alter the refractive indices of the fiber cores through cross-phase modulation, a wavelength tunable LPG dual-core coupler can be realized.
Department of Computer Science and Communication Engineering, Kyushu University, Fukuoka, Japan. fymchan@green.csce.kyushu-u.ac.jp
Florence Y M
FY
Chan
Kiyotoshi
K
Yasumoto