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class="pipe show">|</span><a href="javascript:;" onclick="readmode($('thread_subject').innerHTML, 1199289);" class="show">阅读模式</a> </div> </div> </div><div class="pct"><style type="text/css">.pcb{margin-right:0}</style><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_1199289"> <div align="left"><font face="宋体"> 随着人们对信息传输速度的要求越来越快，对信息量的要求越来越大，宽带传输技术逐渐的取代了窄带传输技术。而在这些技术之中</font>EPON<font face="宋体">（以太网无源光网络）凭借着相对成本较低、容易升级、服务范围大以及带宽分配灵活等优点而被越来越多的人所使用。它结合了成熟的以太网技术和无源光网络技术，大大的提升了上行速率，满足了用户对于上行带宽的需求，因此为很多运营商所喜爱。在</font><font face="Calibri">EPON</font><font face="宋体">中，</font>EPON OLT<font face="宋体">光模块</font>是整个系统中必不可少的一部分，所以下面就说说对它的一些技术要求。</div><div align="center"> <ignore_js_op> <img style="cursor:pointer" id="aimg_97345" aid="97345" src="static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="data/attachment/forum/201612/05/180738g8f4ceahce48ao2o.png" 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face="Calibri">ONU(</font><font face="宋体">光网络单元</font><font face="Calibri">)</font><font face="宋体">通过</font><font face="Calibri">POS(</font><font face="宋体">无源</font>光分路器)<font face="宋体">连接起来，作为</font><font face="Calibri">EPON</font><font face="宋体">的系统的核心，</font><font face="Calibri">OLT</font><font face="宋体">光模块的性能好坏直接决定了整个系统的效率，本文主要介绍了</font><font face="Calibri">EPON OLT</font><font face="宋体">光模块的技术现状与应用范围。</font></div><div align="left"> <strong>EPON OLT<font face="宋体">光模块</font></strong>的技术要求</div><div align="left">1.EPON OLT<font face="宋体">光模块需要较高的发射光功率和接受灵敏度才能抵消掉</font><font face="Calibri">POS</font><font face="宋体">的损耗，从而达到</font><font face="Calibri">10km</font><font face="宋体">以上的传输距离。</font></div><div align="left">2.<font face="宋体">能够根据不同需要设计出对称模式与非对称模式。在对称模式中，上行传输速率与下行传输速率相同，均为</font>10G<font face="宋体">或</font><font face="Calibri">1G</font><font face="宋体">；在非对称模式中使用单模光纤，下行传输</font><font face="Calibri">10G</font><font face="宋体">数据，上行传输</font><font face="Calibri">1G</font><font face="宋体">数据。</font></div><div align="left">3.采用上行突发接受和下行连续发射模式，因此要求<strong>EPON OLT<font face="宋体">光模块</font></strong>的接受部分为突发式和高动态范围。</div><div align="left">4.EPON<font face="宋体">中的</font><font face="Calibri">ONU</font><font face="宋体">会放置在客户端，会要求</font><strong>EPON OLT<font face="宋体">光模块</font></strong>性能可靠、传输功率小、成本较低。</div><div align="left">5.<font face="宋体">能够兼容</font>IEC-60825 <font face="宋体">和</font><font face="Calibri">IEEE</font><font face="宋体">标准 </font><font face="Calibri">802.3ah</font><font face="宋体">，而且能够向下兼容</font><font face="Calibri">1G EPON</font><font face="宋体">方网络协议和拓扑结构。</font></div><div align="left"> <font face="宋体">以上就是</font>EPON<font face="宋体">（以太网无源光网络）系统对光模块的一些技术要求，希望大家在选购</font><font face="Calibri">EPON OLT</font><font face="宋体">光模块的时候能够有一个参考。飞速光纤（</font><font face="Calibri">Feisu.com</font><font face="宋体">）致力于光纤通讯基础网络设备的研发、制造与销售，是您选购光模块<a href="http://b.oecr.com/sell" target="_blank" class="relatedlink">产品</a>的最佳选择。</font></div><br /> </td></tr></table> <div 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