专业英语 Optical Communication.ppt

电信专业英语 English for Electronics and Information Engineering 明德 VIRTUOUS 博学 LEARNED 求是 TRUTHFUL 创新 INNOVATIVE Optical Communications Abstract Classification Optical Fiber Communication Advantages and Disadvantages Applications Contents Abstract Optical communication is a form of long distance communication that uses light as a means of transmitting information. Classification According to the different source characteristics： (1) laser communication (2) non laser communication According to the different transmission medium： (1) wired optical communications (2) wireless optical communication Optical Fiber Communication A basic optical fiber communication system is composed of optical transmitter, optical fiber cable, optical receiver. Optical Fiber 250 cladding 9-10 125 Coated clad structure of optical fiber Optical Transmitters LED Laser diodes Optical Receivers Advantages and Disadvantages Advantages 1. Large capacity of communication. 2. Long distance relay. 3. Excellent security. 4. Small volume, light weight. Disadvantages 1. Crispy texture, poor mechanical strength. 2. Shunt and coupling is not flexible. 3. Fiber optic cable bending radius cannot be too small. 4. Supply power is difficult. Applications Space Communication Internet Communication Optical Gyroscope Medical Endoscope Thank You 电信专业英语 English for Electronics and Information Engineering 明德 VIRTUOUS 博学 LEARNED 求是 TRUTHFUL 创新 INNOVATIVE