Variable coupling coefficient nonlinear directional couplers with self-focusing and self-defocusing nonlinearity.
Nonlinear directional couplers (NLDCs) with a variable coupling coefficient (VCC) in self-focusing and self-defocusing materials are investigated. Specifically, the Gaussian type VCC NLDCs are studied in detail. The results show that the responses of the VCC NLDCs on self-focusing and self-defocusing materials are different, especially when input power is high. The coupled-mode theory can also be used to predict the characteristics of the VCC NLDC on self-focusing material, even when input power is high.
Liu
Gang J
GJ
Department of Physics, Shanghai Jiao Tong University, Dongchuan Road 800, Minhang, 200240, Shanghai, China. lgj@sjtu.edu
Liang
Bin M
BM
Li
Qu
Q
Jin
Guo L
GL