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首页> 外文期刊>Journal of Optics >Feedforward control techniques for Erbium-doped fiber amplifiers - challenges and solutions
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Feedforward control techniques for Erbium-doped fiber amplifiers - challenges and solutions

机译：掺b光纤放大器的前馈控制技术-挑战与解决方案

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摘要

Feedforward control of optical amplifiers is mandatory in wavelength routed networks to avoid traffic interruption resulting from fast input power variations. Effects limiting the efficiency of this control technique are discussed and an overview over techniques compensating for the most important ones is presented. Detailed insight into the wavelength dependence of the optimum pump power setting is provided by a mathematical model. Taking this dependence into account requires to filter the input signal. Three different techniques are explained that make use either of an additional filter placed in front of the input monitor, an embedded gain-flattening filter, or even the erbium-doped fiber itself. Timing is another important issue. Besides introducing a delay in front of the first doped fiber, sophisticated control schemes working without additional optical components by modifying the waveform of the pump signal are analyzed. Different setups such as cascaded amplifier stages with intermediate dispersion compensating fiber are considered. The stages are either controlled individually or are coupled via a pump splitter. Finally, solutions complementing the pump power control by fast adaptation of the attenuation of a variable attenuator are contemplated.
机译：在波长路由网络中，光放大器的前馈控制是必不可少的，以避免因快速输入功率变化而导致流量中断。讨论了限制该控制技术效率的效果，并概述了补偿最重要技术的技术。数学模型提供了对最佳泵浦功率设置的波长依赖性的详细了解。考虑到这种依赖性，需要对输入信号进行滤波。解释了三种不同的技术，它们使用了放置在输入监视器前面的附加滤波器，嵌入式增益平坦滤波器或什至掺fiber光纤本身。时间安排是另一个重要问题。除了在第一条掺杂光纤的前面引入延迟之外，还分析了复杂的控制方案，该方案通过修改泵浦信号的波形而无需附加光学组件即可工作。考虑了不同的设置，例如具有中间色散补偿光纤的级联放大器级。这些级要么单独控制，要么通过泵分配器耦合。最后，考虑了通过快速适应可变衰减器的衰减来补充泵浦功率控制的解决方案。

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