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摘要近年来，随着“最后一公里”对高带宽、低成本接入技术的迫切需求，FSO在视距传输、宽带接入中有了新的发展机遇，同时由于光通信器件制造技术的飞速发展，无线光通信设备的制造成本大幅下降，FSO得到越来越多的应用。虽然目前FSO的使用无需通过政府的频率许可（目前无线电频率划分至300GHz，而光波远远超过该频率），但对于无线电管理部门来说，了解这种全新的通信技术的特征和发展趋势是大有裨益的。利用激光在自由空间传输方式实现建筑物间的无线通信,向电信服务商提供比传统光缆传输速度更决、成本更低、安全可靠的高速通讯解决方案,实现企业与光纤基础设施的最后一公里连通。自由空间光传输(FSO)主要在第一层(物理层)工作,可适应任何协议(SONET、SONET/SDH、ATM、FDDI、以太网、快速以太网)。该技术不依赖于通讯协议,历经实际应用的检验,由客户自行安装使用。技术指标：带宽20M-100MHz;工作距离1000m;可靠性99.999％;灵敏度-40dBm;最大功耗20w。关键字：无线激光通信、最后一公里、FSOAbstractInrecentyears,withthe\lastmile\ofhighbandwidthandlowcostandtheurgentneedofaccesstechnology,FSOstadiaintransmission,broadbandaccessinthenewdevelopmentopportunity,atthesametimeasopticalcomponentsmanufacturingtechnologyrapiddevelopment,thewirelesscommunicationequipmentmanufacturingcostsignificantlylower,andFSOgetmoreandmoreapplications.AlthoughatpresenttheuseofFSOnotthroughthefrequencyofthegovernmentpermission(currentlyradiofrequencydivisionto300GHz,andlightwavesfarmorethanthefrequency),butforradiomanagementdepartmentfor,understandthisnewcommunicationstechnologycharacteristicsanddevelopmenttrendofishelpful.Byusinglaserinfreespacetransmissionmodeofwirelesscommunicationbetweenbuildingsandtelecommunicationsserviceproviderstothanthetraditionalopticaltransmissionspeed,lowercostmorenever,safeandreliablehigh-speedcommunicationssolutions,therealizationenterpriseandopticalfiberinfrastructurelastkilometerconnected.Freespaceopticaltransmission(FSO)mainlyinthefirstlayer(thephysicallayer)work,canadapttoanyagreement(SONET,SONET/SDH,ATMandFDDI,Ethernet,fastEthernet).Thetechnologydoesnotrelyoncommunicationprotocol,afterapplicationoftheinspectionbythecustomertoinstallanduse.Technicalindex:20M-100MHzbandwidth;Theworkingdistanceof1000m;Reliability99.999%;Sensitivityto40dBm;Thepowerconsumptionofthebiggest20w.Keyword:Wirelesslasercommunication、thelastkilometer、FS,目录目录..................................................................................................................................................3第一章无线激光通信概述...........................................................................................................41.1无线激光通信的概念........................................................................................................41.2无线激光通信的优缺点....................................................................................................41.2.1无线激光通信的优势.............................................................................................41.2.2无线激光通信的缺点.............................................................................................51.3无线激光通信的应用场合................................................................................................51.4采用无线激光技术组网通信时需要考虑一些必要影响因素........................................61.5简易无线光通信系统........................................................................................................71.5.1系统组成.................................................................................................................81.5.2简易无线光通信系统基本解决思路......................................................................9第二章光无线通信网.................................................................................................................102.1光无线通信技术..............................................................................................................102.1.1无线光接入（FSO）技术...................................................................................102.1.2光无线通信存在的主要问题及解决方案...........................................................122.2光无线通信网的基本结构..............................................................................................132.3光无线通信技术的应用................................................................................................141无线光通信在局域网连接中的应用.........................................................................152无线光通信在城域、边缘网建设中的应用.............................................................16第三章接入网.............................................................................................................................183.1接入网概述......................................................................................................................183.1.1接入网的概念和特点.........................................................................................183.1.2接入技术综述...................................................................................................183.1.3xDSL技术..........................................................................................................193.2光接入网..........................................................................................................................193.3PON技术.......................................................................................................................213.3.1PON技术概述....................................................................................................213.3.2EPON..................................................................................................................213.3.3GPON..............