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onkeyup="$('fj_btn').href='forum.php?mod=redirect&ptid=299519&authorid=0&postno='+this.value" onkeydown="if(event.keyCode==13) {window.location=$('fj_btn').href;return false;}" title="跳转到指定楼层" /> <a href="javascript:;" id="fj_btn" class="z" title="跳转到指定楼层"><img src="static/image/common/fj_btn.png" alt="跳转到指定楼层" class="vm" /></a> </div> <strong> <a href="http://bbs.oecr.com/thread-299519-1-1.html" id="postnum1194317" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>1</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon1194317" src="static/image/common/online_member.gif" /> <em id="authorposton1194317">发表于 2016-10-31 17:57:29</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=299519&page=1&authorid=163458" rel="nofollow">只看该作者</a> <span class="pipe">|</span><a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=299519&from=album">只看大图</a> <span class="none"><img src="static/image/common/arw_r.gif" class="vm" alt="回帖奖励" /></span> <span class="pipe show">|</span><a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=299519&extra=&ordertype=1" class="show">倒序浏览</a> <span class="pipe show">|</span><a href="javascript:;" onclick="readmode($('thread_subject').innerHTML, 1194317);" 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_1194317"> <div align="left"><font face="微软雅黑"><font size="3">波分复用（WDM）是指利用<a href="http://laser.oecr.com" target="_blank" class="relatedlink">激光</a>器光信号复用到在单根光纤上同时发送多束不同波长激光的技术。每个光信号都有各自的波长，它们通常都集中在1500nm ~ 1600nm范围内，此范围称为WDM色带。光信号经过数据（文本、语音、视频等）调制后都在它独有的色带内传输。WDM支持现有网络扩展带宽而不需要增加额外的光纤线缆数量，而且能够节省光纤安装成本，从而显著的减少城域网和广域网的操作扩容成本。 WDM还可以实现在其他不增加光纤数量的情况下无法实现的解决方案，下面，我们就来详细的探讨一下。<br /> <br /> </font></font></div><div align="center"><font face="微软雅黑"><font size="3"> <ignore_js_op> <img style="cursor:pointer" id="aimg_96772" aid="96772" src="static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="data/attachment/forum/201610/31/175641y5q6t6vknkqmmkee.jpg" file="data/attachment/forum/201610/31/175641y5q6t6vknkqmmkee.jpg.thumb.jpg" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_96772_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>1.jpg</strong> <em class="xg1">(60.24 KB, 下载次数: 83)</em></p> <p> <a href="http://bbs.oecr.com/forum.php?mod=attachment&aid=OTY3NzJ8NDQ0OTQ2N2Z8MTc2NTg5Nzk2OXwwfDI5OTUxOQ%3D%3D&nothumb=yes" target="_blank">下载附件</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_96772" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=96772&handlekey=savephoto_96772">保存到相册</a> </p> <p class="xg1 y">2016-10-31 17:56 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> <br /> <br /> </font></font></div><div align="left"><font face="微软雅黑"><font size="3"> </font></font></div><div align="left"><font face="微软雅黑"><font size="3">在光传输系统中，波长和频率由下式限定：<br /> <br /> </font></font></div><div align="left"><font face="微软雅黑"><font size="3"> </font></font></div><div align="center"><font face="微软雅黑"><font size="3">C =波长*频率<br /> <br /> </font></font></div><div align="center"><font face="微软雅黑"><font size="3"> </font></font></div><div align="left"><font face="微软雅黑"><font size="3">其中C代表常数，指真空中的光速。由此可见，波长改变，频率必然也会随之而改变。那么问题来了，许多人又将波分复用（WDM）与频分复用（FDM）两个概念混淆。接下来，我们先来谈谈从两个方面来区别波分复用（WDM）与频分复用（FDM）。<br /> <br /> </font></font></div><div align="left"><font face="微软雅黑"><font size="3"> </font></font></div><div align="left"><font face="微软雅黑"><font size="3">首先，一方面是，FDM一般是用于描述处理电信号的旧复用系统，而WDM是指处理光信号的较新的复用系统。 其次，另一方面，在FDM系统中每个频率复用表示的是来自单个发射源的型号的复用，而WDM，其主要应用之一是光纤同步网络（SONET）信号的复用，每个SONET信号可以通过时分复用（TDM）技术来传输来自多个源的多个信号。 因此时机应用中，WDM技术一般会结合TDM和FDM技术，以实现更高的带宽利用率。<br /> <br /> </font></font></div><div align="left"><font face="微软雅黑"><font size="3"> </font></font></div><div align="left"><font face="微软雅黑"><font size="3">接下来，我们再来谈谈波分复用的两种技术：密集波分复用（DWDM）和粗波分复用（CWDM）。<br /> <br /> </font></font></div><div align="left"><font face="微软雅黑"><font size="3"> </font></font></div><div align="left"><font face="微软雅黑"><font size="3">DWDM技术是指在一根指定的光纤中，多路复用单个光纤载波的紧密光谱间距，以便利用可以达到的传输性能。DWDM波长间隔非常紧密，因为间隔越近，每根光纤复用的通道数会越多，从而带宽越高。 国际电信联盟（ITU）G.694.1标准规范了DWDM系统的标称波长间隔。每个通道间间隔有3种： 0.4nm(50Ghz), 0.8nm(100Ghz)和1.6nm(200Ghz)。<br /> <br /> </font></font></div><div align="center"><font face="微软雅黑"><font size="3"> <ignore_js_op> <img style="cursor:pointer" id="aimg_96775" aid="96775" src="static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="data/attachment/forum/201610/31/175642rikcrw7kihczic7i.jpg" file="data/attachment/forum/201610/31/175642rikcrw7kihczic7i.jpg.thumb.jpg" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_96775_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>4.jpg</strong> <em class="xg1">(96.41 KB, 下载次数: 89)</em></p> <p> <a href="http://bbs.oecr.com/forum.php?mod=attachment&aid=OTY3NzV8MmY5OTU3NmN8MTc2NTg5Nzk2OXwwfDI5OTUxOQ%3D%3D&nothumb=yes" target="_blank">下载附件</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_96775" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=96775&handlekey=savephoto_96775">保存到相册</a> </p> <p class="xg1 y">2016-10-31 17:56 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> <br /> <br /> </font></font></div><div align="left"><font face="微软雅黑"><font size="3"> </font></font></div><div align="left"><font face="微软雅黑"><font size="3">目前的DWDM系统具有灵活的扩展能力，与通用的单信道系统相比，DWDM系统不仅极大地提高了网络系统的<a href="http://ofc.oecr.com" target="_blank" class="relatedlink">通信</a>容量，充分利用了光纤的带宽，而且它具有扩容简单和性能可靠等诸多优点，特别是它可以直接接入多种业务更使得它的应用前景十分光明。<br /> <br /> </font></font></div><div align="left"><font face="微软雅黑"><font size="3"> </font></font></div><div align="left"><font face="微软雅黑"><font size="3">CWDM技术，从原理上讲，就是利用光复用器将不同波长的光信号复用至单根光纤进行传输，在链路的接收端，借助光解复用器将光纤中的混合信号分解为不同波长的信号，连接到相应的接收设备。CWDM有18 个波段，从1270nm 到 1610nm，每个波段间间隔为20nm。<br /> <br /> </font></font></div><div align="center"><font face="微软雅黑"><font size="3"> <ignore_js_op> <img style="cursor:pointer" id="aimg_96776" aid="96776" src="static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="data/attachment/forum/201610/31/175642sv898u89aszovaq8.jpg" file="data/attachment/forum/201610/31/175642sv898u89aszovaq8.jpg.thumb.jpg" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_96776_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>5.jpg</strong> <em class="xg1">(107.62 KB, 下载次数: 86)</em></p> <p> <a href="http://bbs.oecr.com/forum.php?mod=attachment&aid=OTY3NzZ8ZmRiZWU5N2V8MTc2NTg5Nzk2OXwwfDI5OTUxOQ%3D%3D&nothumb=yes" target="_blank">下载附件</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_96776" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=96776&handlekey=savephoto_96776">保存到相册</a> </p> <p class="xg1 y">2016-10-31 17:56 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> <br /> <br /> </font></font></div><div align="center"><font face="微软雅黑"><font size="3"> </font></font></div><div align="left"><font face="微软雅黑"><font size="3"> </font></font></div><div align="left"><font face="微软雅黑"><font size="3">CWDM的最重要的优点是设备成本低。由于CWDM系统的波长间隔宽，对激光器的技术指标要求较低，所以激光器的结构大大简化，成品率提高。另外，CWDM 系统的功耗和<a href="http://theory.oecr.com" target="_blank" class="relatedlink">物理</a>尺寸均比 DWDM系统的小得多。除此之外，CWDM光调制采用非冷却激光，用<a href="http://electronic.oecr.com" target="_blank" class="relatedlink">电子</a>调谐；而 DWDM 采用的是冷却激光，用温度调谐。由于在一个很宽的光波长区段内温度分布很不均匀，因此温度调谐实现起来难度很大，成本也很高。CWDM 避开了这一难点，因而大幅降低了成本，目前 CWDM 系统成本一般只有 DWDM 的 30％。<br /> <br /> </font></font></div><div align="left"><font face="微软雅黑"><font size="3"> </font></font></div><div align="left"><strong><font face="微软雅黑"><font size="3"><a href="http://b.oecr.com/sell" target="_blank" class="relatedlink">产品</a>展示</font></font></strong></div><div align="left"><strong><font face="微软雅黑"><font size="3">CWDM光模块</font></font></strong></div><div align="left"><font face="微软雅黑"><font size="3">通过外接波分复用器，将不同波长的光信号复合在一起，通过一根光纤进行传输，从而节约光纤资源。同时，接收端需要使用波分解复用器对复光信号进行分解。<br /> <br /> </font></font></div><div align="left"><font face="微软雅黑"><font size="3"> </font></font></div><div align="center"><font face="微软雅黑"><font size="3"> <ignore_js_op> <img style="cursor:pointer" id="aimg_96773" aid="96773" src="static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="data/attachment/forum/201610/31/175641siqit50wwz0i11iq.png" file="data/attachment/forum/201610/31/175641siqit50wwz0i11iq.png.thumb.jpg" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_96773_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>2.png</strong> <em class="xg1">(459.5 KB, 下载次数: 84)</em></p> <p> <a href="http://bbs.oecr.com/forum.php?mod=attachment&aid=OTY3NzN8ZWZiNjUxNzZ8MTc2NTg5Nzk2OXwwfDI5OTUxOQ%3D%3D&nothumb=yes" target="_blank">下载附件</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_96773" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=96773&handlekey=savephoto_96773">保存到相册</a> </p> <p class="xg1 y">2016-10-31 17:56 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> <br /> <br /> </font></font></div><div align="left"><font face="微软雅黑"><font size="3"> </font></font></div><div align="left"><strong><font face="微软雅黑"><font size="3">产品特点</font></font></strong></div><div align="left"><font face="微软雅黑"><font size="3">1270nm~1610nm，18个信道可供选择</font></font></div><div align="left"><font face="微软雅黑"><font size="3">可以选择的封装SFP/SFP+/XFP/X2</font></font></div><div align="left"><font face="微软雅黑"><font size="3">单一电源供电，+3.3V或者+5V </font></font></div><div align="left"><font face="微软雅黑"><font size="3">工作温度0°C~70°C（商业级），‐40℃‐85℃（工业级）</font></font></div><div align="left"><font face="微软雅黑"><font size="3">符合RoHS标准</font></font></div><div align="left"><font face="微软雅黑"><font size="3">支持DDM功能<br /> <br /> </font></font></div><div align="left"><strong><font face="微软雅黑"><font size="3"> </font></font></strong></div><div align="left"><strong><font face="微软雅黑"><font size="3">DWDM光模块</font></font></strong></div><div align="left"><font face="微软雅黑"><font size="3">原理和CWDM差不多，DWDM光模块通常有40个常用通道可供选择，C17~C61，支持的传输距离最远可达100km。<br /> <br /> </font></font></div><div align="center"><font face="微软雅黑"><font size="3"> <ignore_js_op> <img style="cursor:pointer" id="aimg_96774" aid="96774" src="static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="data/attachment/forum/201610/31/175642vvsubmy9gvl1o1vo.jpg" file="data/attachment/forum/201610/31/175642vvsubmy9gvl1o1vo.jpg.thumb.jpg" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_96774_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>3.jpg</strong> <em class="xg1">(112.85 KB, 下载次数: 86)</em></p> <p> <a href="http://bbs.oecr.com/forum.php?mod=attachment&aid=OTY3NzR8MDNjMDdjMTB8MTc2NTg5Nzk2OXwwfDI5OTUxOQ%3D%3D&nothumb=yes" target="_blank">下载附件</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_96774" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=96774&handlekey=savephoto_96774">保存到相册</a> </p> <p class="xg1 y">2016-10-31 17:56 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> <br /> <br /> </font></font></div><div align="left"><font face="微软雅黑"><font size="3"> </font></font></div><div align="left"><font face="微软雅黑"><font size="3">飞速光纤（Feisu.com）是一家致力于光通讯产品研发设计并提供系统解决方案的公司，开发出了一系列WDM-PON解决方案，包括CWDM光分插复用器、DWDM光分插复用器、WDM光模块以及超高速光纤传输过程中的相关产品，例如光放大器、波长转换器、光分路器、光衰减器、光开关等。更多详情请访问飞速官网。</font></font></div><br /> </td></tr></table> </div> <div id="comment_1194317" class="cm"> </div> <div id="post_rate_div_1194317"></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=299519&formhash=80a522d3" id="k_favorite" onclick="showWindow(this.id, this.href, 'get', 0);" onmouseover="this.title = $('favoritenumber').innerHTML + ' 人收藏'" 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