(位移传感器专业英语）Optical Communications.ppt

Optical Communications Mao Yanlong Huo Jiahao Wu Fei Zhao Yulin Liu Xiaomin Yang Yongbin Sun Qingdong Abstract Optical communication?is any form of?telecommunication?that uses?light?as the?transmission medium. An optical?communication system?consists of a?transmitter, which encodes a?message?into an optical?signal, a?channel, which carries the signal to its destination, and a?receiver, which reproduces the message from the received optical signal. Contents The history of Optical communications Forms of Optical Communication Optical Transmission System Concepts Optical Networking Optical Computers 1.The history of Optical communications 1.The history of Optical communications 1. The invention of the LASER (in the late 1950s) 2. The development of low loss optical fibre (1970s) 3. The invention of the optical fibre amplifier (1980s) 4. The invention of the in-fibre Bragg grating (1990s) 2.Forms of optical communication An optical?communication system?consists of a?transmitter, which encodes a?message?into an optical?signal, a?channel, which carries the signal to its destination, and a?receiver, which reproduces the message from the received optical signal. There are many forms of non-technological optical communication, including body language and sign language. Techniques such as semaphore lines, ship flags, smoke signals, and beacon fires were the earliest form of technological optical communication. 3.Optical Transmission System Concepts Advantages of Optical Communication Weight and Size Information Capacity No Electromagnetic Interference Distances between Regenerators Open Ended Capacity Better Security Disadvantages of Optical Communication Joining Cables Bending Cables Slow Standards Development Optics for Tr