Textbook in PDF format This book highlights the applications of optoelectronic chaotic signals in various fields, including lidars/radars, sensors, secure communication, and millimeter/terahertz noise generation. It covers the following topics: - In lidar/radar detection, the book discusses chaotic lidars, chaotic through-wall life detection radars, and chaotic ground penetrating radars. - Regarding optical fiber measurement and sensing, it provides a detailed examination of chaotic time-domain reflection measurement and chaotic distributed fiber sensing technologies. - In the realm of secure communication, the book reviews optical chaos synchronization, chaotic secure optical communication, physical random number generators, and secure key distribution based on chaotic synchronization. - For noise generation, it summarizes the millimeter/terahertz noise generation mechanism and noise source prototypes that utilize photo-mixing chaotic lights