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1、Optical CommunicationsMembers: Xiaoyu Zhao Chenjiao Bai Fanfan Lian Qiaoli Xu Jun Liu Yao Xu Jun HuDefinitionTechnologyOptical transmitters/sourcesOptical receivers/detectorsAdvantagesTypical optical communicationsOptical fiber communicationsFree-space optical communicationsApplications OverviewWhat
2、 are optical communicationsany form of telecommunication that uses light as the transmission medium.consists of a transmitter, a channel a receiverTechnologyOptical SourcesLight Emitting Diode ( LED ) LaserFabry-Perot Laser (FP)Distributed Feedback Laser (DFB) Vertical Cavity Surface Emitting Laser
3、(VCSEL)TechnologyOptical DetectorsAvalanche Photodetector (APD)Better sensitivity than PIN detectorTemperature sensitiveData rate to 2.5GbpsP-I-D Photodiode: Wideband 800 - 1600 nmHigh data rate up to 100GbpsAdvantages High frequencyShort wavelengthHigh transparency for electromagnetic radiationTypi
4、cal optical communicationsOptical fiber communicationsFree-space optical communicationsOptical fiber communicationduring 1970s，the development of extremely low-loss optical fibers Transmit information from one place to another by sending pulses of light through an optical fiberApplicationsTransmit t
5、elephone signalsTransmit Internet communicationTransmit cable television signalsFree-space optical communicationFree-space：air，outer space，vacuum，or something similarUses light propagating in free space to transmit data for telecommunications or computer networkingApplicationsLAN-to-LAN connections on campuses at Fast Ethernet or Gigabit Ethernet speedsLAN-to-LAN connections in a city ,a metropolitan area networkConverged Voice-Data-ConnectionTemporary network installationThank you!
