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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_92181"> 掺镨光纤放大器的关键技术及其在系统中的应用(下)<br /> 2003-03-10 慧聪广电商务网<br /> <br /> <br /> 光库通讯（珠海）有限公司 胡小波 郑鸿章<br /> Advanced Fiber-Resources Communications (Zhuhai) Limited<br /> <br /> <br /> 三．实用型PDFA的性能参数<br /> <br /> 本公司现在提供的O-Band工程化实用型PDFA是采用高可靠性<a href="http://sensor.oecr.com" target="_blank" class="relatedlink">半导体</a>泵浦源与高效率的PDF设计技术，并对PDFA光路结构进行优化设计而制造的整机，其功率可高达17dBm以上，工作带宽为1290nm至1320nm，非常低的模拟失真，可广泛适用于1310nm CATV系统，模拟光<a href="http://ofc.oecr.com" target="_blank" class="relatedlink">通信</a>系统，DWDM系统，及光器件性能的<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测试</a>。其整体性能参见表1。<br /> <br /> <br /> <br /> 表1 O-Band PDFA性能参数<br /> <br /> 四．PDFA在光纤通信系统中的应用<br /> <br /> 1．PDFA在CATV系统中的应用<br /> <br /> 图4展示了PDFA在24路调频副载波分复用（FM-SCM）模拟试验系统中的应用，试验结果表明，系统的总功率预算为75dB，传输距离210km，是至今FM-SCM电视信号传输的最远距离，表明采用PDFA后可在相当长的距离上传输高质量的模拟电视图像，为现有的1310nm波长光纤CATV的进一步改造于发展提供了有效的技术支撑。<br /> <br /> <br /> <br /> 另一个CATV应用实例是40路残留边带调幅视频传输系统（AM-VSB）。发射机工作波长1302nm，为直接调制的DFB<a href="http://laser.oecr.com" target="_blank" class="relatedlink">激光</a>器，调制深度为7.1%/通道。加入PDFA后提高了10dB的功率预算。表2比较了加入PDFA前后系统性能参数。<br /> <br /> <br /> <br /> 2．PDFA在SDH系统中的应用<br /> <br /> 图5为在已铺设的光纤网络上进行的现场试验系统结构，系统速率为10Gb/s，系统长度为120km。尽管试验采用的是直接调制DFB激光器发送光信号，而未滤除啁啾，而且传输速率高达10Gb/s，但传输性能仍很好，成功的延长了传输距离。这一试验表明PDFA为已铺设的1310nm波长的常规数字光纤系统提供了一条简单的升级途径，对光纤和发送机无须做任何改动，就可以允许10Gb/s的高速数据传输100公里以上的距离。<br /> <br /> <br /> <br /> 以上试验表明，PDFA无论是应用在已铺设的SDH数字光纤通信系统还是在光纤CATV系统中，从技术性能上考虑都是可行的。<br /> <br /> 五．结语<br /> <br /> 随着PDF的制造技术的进一步提高，新型玻璃基质<a href="http://material.oecr.com" target="_blank" class="relatedlink">材料</a>的PDF的制造<a href="http://optics.oecr.com" target="_blank" class="relatedlink">工艺</a>的逐步成熟，半导体泵浦激光器的可靠性和功率的提高，及光路结构的优化，PDFA的性能必将有更大的提高。<br /> <img src="static/image/smiley/Pink/01.gif" smilieid="179" border="0" alt="" /> 我国以前铺设的光纤CATV系统与SDH系统大部分为1310nm的系统，在PDFA没有实用化前，要对1310nm的系统进行升级改造，是非常困难或投资很大的，而工程实用型PDFA的出现，给原有系统的改造和新建1310nm系统提供了一条简捷的、投资少、见效快的途径。对我国特别是相对落后的中西部地区有线电视事业和电信事业的发展肯定会起到很大的推进作用。<br /> <br /> 参考文献：<br /> 1.Optical Fiber Amplifiers: Materials, Devices, And Applications <br /> 2.Optical Fiber Communications: Principles and Practice <br /> 3.光放大器及其应用 杨祥林<br /> 4.IPG公司内部文献<br /> 5.光库通讯（珠海）有限公司内部文献<br /> <br /> </td></tr></table> </div> <div id="comment_92181" class="cm"> </div> <div id="post_rate_div_92181"></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=11716&formhash=e6275e0c" id="k_favorite" onclick="showWindow(this.id, this.href, 'get', 0);" onmouseover="this.title = $('favoritenumber').innerHTML + ' 人收藏'" title="收藏本帖"><i><img src="static/image/common/fav.gif" alt="收藏" />收藏<span 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