Abstract
This chapter discusses two related topics: (i) chaos-based and (ii) terahertz (THz) free-space optical (FSO) communications. The first one is chaos-based FSO communication in which the application of chaos to communications can provide many promising new directions in the areas of coding, security, and ultra-wideband communications. The chapter describes generation and synchronization of optical chaotic signal where chaotic system can be applied to the encryption/decryption blocks of a digital communication system. A hybrid electronic/optical-synchronized chaos communication system is described to achieve secure communication. Chaotic modulation of data may be less sensitive to electronic nonlinearities in the FSO transceivers. The chapter points out that the use of chaotic signals may be very attractive as carriers in spread spectrum communications. A theoretical analysis demonstrating the capabilities of a secure free-space communication system using phase shift keying (PSK) modulation scheme and coherent digital receiver is presented to enhance communications security. Some recent experimental results of chaotic free-space laser communication over a turbulent channel are described.
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