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首页> 外文期刊>Optoelectronics, IET >Semiconductor optical amplifiers in negative-exponential fading: regenerators and pre-amplifiers
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Semiconductor optical amplifiers in negative-exponential fading: regenerators and pre-amplifiers

机译：负指数衰落中的半导体光放大器：再生器和前置放大器

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摘要

In this study, the authors discuss the mitigation of negative-exponential fading in optical wireless communication systems. The mitigation technique involves the utilisation of a semiconductor optical amplifier (SOA) that, depending on the link arrangement, acts either as regenerator or pre-amplifier. As a regenerator, the SOA gain saturates during normal link operation and increases when the link experiences a fade. This unbalanced SOA operation serves towards the equalisation of the signal power at its output and fades become less severe and of reduced duration. The analytical results predict that the fade probability is reduced by over 90% and the scintillation index is improved by 75% for an optimal level of the received power. Moreover, the average duration of fades is also reduced by 68% for the same power level. As a pre-amplifier, the SOA modifies the noise statistics at the receiver and provides a static sensitivity increase of at least 10 dB at 10 Gb/s, depending on the bit-error-rate (BER) target. The analytical results show that this sensitivity improvement imparts a reduction of one order of magnitude on the average BER, of at least 94% on the outage probability and of at least 78% on the average duration of fades.
机译：在这项研究中，作者讨论了缓解光学无线通信系统中负指数衰落的方法。缓解技术涉及利用半导体光放大器（SOA），该半导体光放大器（SOA）取决于链路布置，充当再生器或前置放大器。作为再生器，SOA增益在正常链接操作期间达到饱和，并在链接出现衰落时增加。这种不平衡的SOA操作可实现其输出信号功率的均衡，并且衰落变得不太严重，持续时间也缩短了。分析结果预测，对于最佳接收功率水平，衰落概率降低90％以上，闪烁指数提高75％。此外，在相同功率水平下，平均衰落持续时间也减少了68％。作为前置放大器，SOA会修改接收器处的噪声统计数据，并在10 Gb / s下提供至少10 dB的静态灵敏度提高，具体取决于误码率（BER）目标。分析结果表明，这种灵敏度的提高使平均BER降低了一个数量级，中断概率至少降低了94％，平均衰落持续时间降低了至少78％。

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