Optical Communications光通信.ppt

Optical Communications Members: Xiaoyu Zhao Chenjiao Bai Fanfan Lian Qiaoli Xu Jun Liu Yao Xu Jun Hu Definition Technology Optical transmitters/sources Optical receivers/detectors Advantages Typical optical communications Optical fiber communications Free-space optical communications Applications Overview What are optical communications any form of telecommunication that uses light as the transmission medium. consists of a transmitter, a channel a receiver Technology Optical Sources Light Emitting Diode ( LED ) Laser Fabry-Perot Laser (FP) Distributed Feedback Laser (DFB) Vertical Cavity Surface Emitting Laser (VCSEL) Technology Optical Detectors Avalanche Photodetector (APD) Better sensitivity than PIN detector Temperature sensitive Data rate to 2.5Gbps P-I-D Photodiode: Wideband 800 - 1600 nm High data rate up to 100Gbps Advantages High frequency Short wavelength High transparency for electromagnetic radiation Typical optical communications Optical fiber communications Free-space optical communications Optical fiber communication during 1970s，the development of extremely low-loss optical fibers Transmit information from one place to another by sending pulses of light through an optical fiber Applications Transmit telephone signals Transmit Internet communication Transmit cable television signals Free-space optical communication Free-space：air，outer space，vacuum，or something similar Uses light propagating in free space to transmit data for telecommunications or computer networking Applications LAN-to-LAN connections on campuses at Fast Ethernet or Gigabit Ethernet speeds LAN-to-LAN connections in a city ,a metropolitan area network Converged Voice-Data-Connection Temporary network installation Thank you!