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An increasing attention has been paid lately to the noise-induced transitions arising in nonlinear systems far from thermodynamic equilibrium [1-12]. It is known that the noise in nonlinear systems has not only disorganizing effects but under certain conditions leads also to the appearance of nonequilibrium phase transitions that have no deterministic analogues [9]. The Optical bistable system with a medium of two-level atoms is one of the systems in which the noise-induced transitions have been predicted; the external multiplicative white noise can induce optical bistability (OB) [7-9] and multistability for high values of noise intensity [10]. For the same system the colored noise influence on the OB has also been studied, revealing that optical bimodality can arise from the multiplicative colored noise, as well as due to the additive colored noise [11]. The theoretical study and experimental observation of the OB phenomenon in semiconductors present a large interest owing to its possibility of practical applications. Many experimental results have demonstrated the existence of OB in different types of semiconductors [13-15]. Theoretically, the OB in semiconductors has also been investigated in a series of works [7, 16-18].

Optical Bistability Induced by Additive Colored Noise in the Exciton-Biexciton System