The nonlinear optical response of an asymmetric λ/4-shifted distributed-feedback GaAs/AlAs heterostructure is investigated using numerical methods, and also demonstrated experimentally. This structure exhibited both optical switching and bistability at incident wavelengths near λ=884 nm. The observed bistability threshold of less than 1 kW cm−2 is more than an order of magnitude smaller than that of any previously measured distributed-feedback heterostructures.
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Janz et al. (1995) studied this question.