Sign-dependent nonlinear response of directional couplers

F. J. Fraile-Pelaez, G. Assanto and D. Heatley

Opt. Commun. 77, 402-406 (1990)


We present a simplified local-mode analysis of the nonlinear directional coupler. This novel approach predicts a splitting in the transfer function when assuming different signs for the nonlinearity, in agreement with the results of the Beam Propagation Method.