Fiber communication system and network revolutionized our global telecommunications network. With their very high data rates and capacity,optical fiber systems link continents, countries, cities and end users. They have enabled the internet and changed our society. This course is a professional course aimed to communication engineering. After learning this subject, students can grasp the basic concept, theories and key technologies of optical communication and understand the system structure and network, the device principle, design method and performance analysis of optical communication system and network. It aims to train the students to apply principle of optical communication system and network to analyze and solve the practical problems in the optical communication field.