Dming recent years, the phenomena of self-organization and chaos have received considerable attention due to its fundamental and applied interests. The main aim of technological progress is the production of structures with stable prope1iies and the possibility of their application in different areas. Today's modem world is inconceivable without semiconductor lasers, which are used for optical communication, and in many applications in medicine, biology, space, etc. Arakawa [1] predicted that semiconductor lasers with quantum dots active medium have small temperature dependence perfonnance than the existing semiconductor lasers, and that they will not degrade at the high temperature. Other advantages of quantum dots active medium includes the reduction of the threshold cunent and increase of the amplification coefficient [2]. In this paper, we focus on investigations of phenomenon of dynamical chaos of semiconductor lasers with quantum dots active medium shown in Fig. I. We consider a single mode quantum dot laser coupled to a longitudinal double cavity. The first minor is located at distance l from the laser facet. The distance between first and second mirrors is L. The optical feedback phase 'I' in the second cavity can be controlled by injecting cmTent into the passive section. We assume that the cmTent injected in the passive section is small enough to affect only the refractive index, so that the optical length of the resonator is changed in the sub-wavelength range. In this way, while the feedback phase <p can be tuned, the change in the delay time between the two mirrors is negligible . We show that two such devices as in Fig.I can be synchronized when operating in the chaotic regime in a master-slave configmation. For the parameter values where good synchronization is achieved, it is possible to encode a message in the canier using the chaos modulation technique.