The study of synchronization techniques and related topics in the design of high data rate, deep space, optical communication systems was reported. We call this generation of a chaotic optical carrier by electronic injection.Ī Study of Synchronization Techniques for Optical Communication Systems

This is the first electronic/ optical hybrid system to be demonstrated. Past demonstrations of synchronized chaos based, secure communication systems have used either an electronic chaotic carrier or an optical chaotic carrier (such as the chaotic output of various nonlinear laser systems). The optical chaotic carrier is photodetected to regenerate an electronic signal for synchronization in a matched electronic receiver The system has been successfully used for the transmission and recovery of a chaos masked message that is added to the chaotic optical carrier. The chaotic signal is generated electronically and injected, in addition to a constant bias current, to a semiconductor laser to produce an optical carrier for transmission. Toomey, J P Kane, D M DavidoviÄ‡, A Huntington, E HĪ hybrid electronic/ optical system for synchronizing a chaotic receiver to a chaotic transmitter has been demonstrated. Hybrid electronic/ optical synchronized chaos communication system. The results have obvious application to optical radar and ranging systems, as well as the time synchronization problem. The closely allied problem of maintaining timing during pulse position modulation is also considered. Extension is made to systems that perform separate acquisition and tracking operations during synchronization. Maximum aposteriori (MAP) estimation procedures are used to generate optimal estimators, with emphasis placed on their interpretation as a practical system device, Estimation variances are used to aid in the design of the transmitter signals for best synchronization. The time synchronization problem in an optical communication system is approached as a problem of estimating the arrival time (delay variable) of a known transmitted field. Map synchronization in optical communication systems

Ssci digital optical converter