THEORY OF LOW-THRESHOLD OPTICAL SWITCHING IN NONLINEAR PHASE-SHIFTED PERIODIC STRUCTURES

The theory of phase-shifted nonlinear periodic structures operating in the stationary regime is presented. The transmissive properties of th e structure are analyzed by solution of the corresponding set of nonli near coupled-mode equations exactly. Extremely low switching intensiti es are found for the special case of lambda/4-shifted structures. An a ll-optical low-intensity switching configuration that uses a wavelengt h-tunable source and a lambda/4-shifted nonlinear structure is propose d. Advantages of the phase-shifted distributed-feedback design in all- optical switching applications are discussed.