Simultaneously bidirectional transmission of message between three coupled semiconductor lasers

In this paper, we present a chaos-based scheme which allows for bidirectional transmission and recovery of message by simultaneously changing the feedback phase and coupling phase. In our scheme, three semiconductor lasers are mutually connected, and in each link the partially transparent mirror is used to supplement the degree of freedom to produce the chaotic carrier, moreover, the coupling between semiconductor laser 1, laser 2 and laser 3 through a partially transparent mirror induces the delay and chaos dynamics. We numerically have proven that three lasers can be fully in synchronization, and the message which is introduced by ON/OFF phase shift keying on the ends of each laser can be successfully encoded and decoded, at last the system can realize the bidirectional transmission of message between three parties.