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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_331976"> 随着近年来<a href="http://ofc.oecr.com" target="_blank" class="relatedlink">通信</a>业务突飞猛进的发展，人们对通信系统在传输距离、交换容量等方面的要求不断提高。我们看到，经过几年的发展，无论是在长途传输层面还是在城域网层面，<a href="http://ofc.oecr.com" target="_blank" class="relatedlink">光通信</a>技术都得到了广泛应用，其中WDM(波分复用)技术更是不断走向成熟。 <p>WDM技术指在同一芯光纤中同时传输多个不同光波波长信道的技术。一芯光纤传输一个光波波长信道的系统，由于“<a href="http://electronic.oecr.com" target="_blank" class="relatedlink">电子</a>瓶颈”的限制，系统的通信容量不可能有很大的增长。采用波分复用技术，不同的波长信道可以同时在同一芯光纤中传输，使通信容量成倍或数十倍、数百倍增长，以满足日益增长的信息传输需求。为了适应通信网络发展的需要，WDM技术在沿革过程中也呈现出一些新的特点。</p><p><strong>WDM向更大容量更透明传输发展</strong></p><p>传输容量和效率正进一步提高。为了更充分利用光纤低损耗带宽，人们在WDM的基础上又提出了密集波分复用技术(DWDM)。DWDM技术指在当前1.55μm波段密集放置更多信道，同时在同一芯光纤中传输。然而，人们现在已不满足这样的密集度，开始想方设法寻找更窄的信道间隔，使传输容量进一步加大，力求更充分地利用光纤的可用带宽。目前，中兴公司研发的大容量、超长距离传输DWDM系统容量可升级到160×10Gbit/s，实现超过5000km的无电中继传输；烽火通信成功推出80×40GDWDM系统，取得了新的突破，并且将该系统成功应用于中国电信80×40Gb/sDWDM上海—杭州工程。</p><p>另外，WDM对各种类型的业务透明传输的优势正越来越明显。WDM技术具有很多优势，在近几年得到快速发展......<br/><br/>欲知本文更多详情，请查看：<a href="http://www.ofweek.com/html/dy_article/1/2007112105.html">http://www.ofweek.com/html/dy_article/1/2007112105.html</a></p></td></tr></table> </div> <div id="comment_331976" class="cm"> </div> <div id="post_rate_div_331976"></div> </div> </div> </td></tr> <tr><td class="plc plm"> <div id="p_btn" class="mtw mbm hm cl"> <a href="http://club.oecr.com/home.php?mod=spacecp&ac=favorite&type=thread&id=51784&formhash=3d64808b" 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