Abstract
Complete all-optical switching in materials such as semiconductors has proved difficult. If the nonlinear index of refraction is utilized. there is also strong two-photon absorption (TPA).1 It has been shown that the typical soliton solutions are not valid in the presence of TPA.2 Therefore, traditional soliton switching is degraded. However, we present a new coupled-mode analysis that incorporates TEA and find exact solutions for which complete switching can occur. Using a coupled-mode analysis3in which gain is used to offset the nonlinear loss due to TPA, we derive the set of equations for nonlinear directional couplers.
© 1992 Optical Society of America
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