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<div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_130515"> <P>可调式<a href="http://laser.oecr.com" target="_blank" class="relatedlink">激光</a>源（Tunable Laser）</P> <P>目前的DWDM系统普遍已经达到32路，甚至40路波长波分复用，若在这种情形下使用固定波长的激光源，则40个波长就要搭配40个激光源，再加上每个波长都要准备3至5个备品，将形成庞大的成本负担，对于系统的可靠度也是挑战。如果采用可调式激光源，就可以1颗激光器取代多个固定波长之激光，同时备品总共也只需要3至5颗即可，大大的降低了系统成本。</P> <P>能实现可调式的激光源主要有３种，即超周期结构光栅形ＤＢＲ（ＳＳＧＤＢＲ）激光器、取样光栅耦合器反射器（ＧＣＳＲ）激光器和取样光栅ＤＢＲ（ＳＧＤＢＲ）激光器。它们的ＣＷ调谐范围都大于４０ｎｍ，最大可达１００ｎｍ。其中ＳＧＤＢＲ和ＳＳＧＤＢＲ很容易与调制器集成。美加州大学在ＯＦＣ’９９上报道了ＥＡ调制器与宽调谐激光器的集成。激光器采用ＳＧＤＢＲ结构，该集成光源的特性为：Ｉｔｈ为２０ｍＡ，当注入电流为７５ｍＡ时输出功率１．２ｍｗ，ＣＷ可调范围为４１ｎｍ，可产生５１个不同的波长信道，信道间隔１００ＧＨｚ，在整个调谐范围内ＳＭＳＲ＞３５ｄＢ，前后镜面的最大调谐电流分别为２０．５和２３．５ｍＡ，当偏压为－４．０Ｖ时所有波长上的消光比都大于２２ｄＢ。</P> <P>为了降低ＷＤＭ光源的成本，日本ＮＥＣ公司在一块晶片上制成了具有不同波长的ＤＦＢ激光器／调制器集成光源。该器件的制作<a href="http://optics.oecr.com" target="_blank" class="relatedlink">工艺</a>有两大改进，一是采用了最近研制成的电场－大小－变化的<a href="http://electronic.oecr.com" target="_blank" class="relatedlink">电子</a>束光刻技术，它能将光栅周期控制在0.0012ｎｍ范围内；二是窄条选择的ＭＯＶＰＥ技术，可以控制每一信道上激光器有源层和调制器吸收层的带隙波长。激光器为ＭＱＷ结构。所制成的集成器件在1.523μｍ～1.585μｍ的波长范围内有４０个信道，间隔为２００ＧＨｚ，标准偏差0.39ｎｍ。具有很均匀的激射特性和调制特性，阈值电流10ｍＡ，－２Ｖ时的消光比为20ｄＢ，ＳＭＳＲ大于35ｄＢ，注入电流100ｍＡ时输出光功率大于４ｍｗ，３ｄＢ调制带宽为3.8ＧＨｚ。该器件经2.5Ｇｂｉｔ／ｓ、６００ｋｍ的光纤传输后的功率代价小于１ｄＢ。</P> <P>可调式激光技术目前发展并不成熟，大部分<a href="http://b.oecr.com/sell" target="_blank" class="relatedlink">产品</a>都处在实验室阶段或试用初期。首先必须在输出功率和调节范围之间做取舍；其次大部分产品还不适合大规模生产。另外如何以便捷的方法来<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测试</a>如此多的波长，最后控制<a href="http://electronic.oecr.com" target="_blank" class="relatedlink">电路</a>也是个问题，因此在这方面的研究还在进行。</P> <P>可调式激光在未来光网路中的应用主要表现在动态波长分配，通过可调激光以及可调滤波器等主被动元件，实现基于波长的通道分配。对于小于16个节点的都会网路，利用可调激光可以提供简单可靠的光网络方案，而更大的网络架构可同时结合OXC。目前Alcatel和Marconi均已推出此类光网络方案。</P></td></tr></table> </div> <div id="comment_130515" class="cm"> </div> <div id="post_rate_div_130515"></div> </div> </div> </td></tr> <tr><td class="plc plm"> <div id="p_btn" class="mtw mbm hm cl"> <a 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