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两段级联掺铒光纤放大器的最佳光纤长度 总被引:2,自引:0,他引:2
基于Giles模型.研究了980nm和1480nm泵浦的两段级联掺铒光纤放大器(EDFA)的最佳光纤长度随泵浦功率和信号功率的变化关系,并与单段EDFA的最佳光纤长度进行了比较,在实用泵浦功率条件下,前者比后者长30%以上。 相似文献
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Erbium-doped fiber amplifiers (EDFAs) with high gain generally degrade the signal-to-noise ratio by at least 3 dB. In the conventional wavelength band, noise figures close to the so-called quantum limit can be obtained by strong pumping. Due to their lower average population in the metastable level, this limit is not reached by amplifiers designed for the long-wavelength band (L-band). In this paper, the lower noise figure limit is determined for such amplifiers. It has been found that the noise figure for typical gain values of about 30 dB can be very close to the quantum limit, whereas significantly larger noise figure values result for small amplifier gains. The lower limit decreases with increasing gain if the gain values are beyond 5 dB. In addition, the results reveal that low temperatures yield better noise figure. 相似文献
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电力通信系统实现长距离通信传输,在降低建设及维护成本,提高系统可靠性具有很实际的意义。本文分析了电力通信系统长距离通信传输存在的问题并提出利用光功率放大器实现长距离通信传输解决方案,可为电力通信长距离通信传输系统的设计和建设提供一种参考方法。 相似文献
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高容量SCM光纤通信技术中LD非线性噪声的分析 总被引:1,自引:0,他引:1
本文对LD发光特性的非线性在高容量SCM光纤通信系统中所引起互调干扰作了理论性的分析研究,导出了一些有关的计算公式,为高容量光纤通信系统的设计提供了一些理论方面的依据。 相似文献
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本文首先分析了光纤SCM通信系统中存在的噪声,然后深入讨论了光检测器的散粒噪声及其与光器件工作参数的关系和对载噪比C/N的影响,结论可作为实际系统设计时的依据。 相似文献
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《Optical Fiber Technology》2014,20(5):483-486
We report the control of population inversion in a continuously pumped fiber amplifier using pulse trains with a finite number of pulses. We first measured the pulse interval dependence of the amplifier gain, which indicated that the gain was in the quasi-continuous condition for an interval of less than 1 μs and in the single-shot condition for an interval of approximately 1 ms. For population control, the population change was probed using pulse trains that induced a population change through a modified pump–probe method. We observed that a change in the population inversion was not determined by the number of pulse but by the number of total input photons. Temporal profiles of the population inversion were analyzed using a model derived for single pulse amplification. 相似文献
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本文提出了掺饵光纤放大器(EDFA)增益的精确模型,并对EDFA的增益进行了计算,其结果与实验相当符合。并在此基础上,结合光子数的Master方程和Personick关于接收机的理论,详细地分析了当EDFA为前放、中断时,其增益与接收机的噪声以及灵敏度在一定误码率下的关系。 相似文献
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研究C—band种籽光对L—band EDFA泵浦转换效率的影响,实验表明,在L—band EDFA中注入C—band种籽光时,可以有效提高泵浦转换效率。 相似文献
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根据掺铒光纤放大器(EDFA)两能级放大模型推导出黑盒模型(BBM,black box model),随后给出了黑盒模型的通用测量步骤及注意事项。该模型基于EDFA的外特性,运算速度快,同时考虑了EDFA的饱和、增益不平坦特性以及ASE噪声谱的非均匀性。它对于在现场实验前仿真和分析系统性能具有较高的实用价值. 相似文献
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基于光纤环形镜的L-波段掺铒光纤放大器增益的提高 总被引:3,自引:0,他引:3
提出了一种基于光纤环形镜作为反射器的反射式L-波段掺铒光纤放大器(EDFA)结构。光纤环形镜不但可以反射后向放大自发辐射(ASE)作为二次抽运源,而且还可以反射信号,使信号得到二次放大。当抽运功率为115mW时。在1570~1605nm波长范围内,反射式L-波段掺铒光纤放大器的平坦小信号增益达到29.14dB,与前向抽运方式L-波段掺铒光纤放大器相比(保持平坦性不变)。增益提高了5.33dB。分别输入波长为1580nm和1600nm的信号,反射式L-波段掺铒光纤放大器的饱和输出功率为7.63和7.6dBm.与前向抽运方式L-波段掺铒光纤放大器相比分别提高了2.98和3dB。 相似文献
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We evaluate the system power penalty for different modulation formats-nonreturn-to-zero (NRZ), return-to-zero (RZ), dispersion-managed solitons, and prechirped RZ-in the presence of polarization mode dispersion (PMD) for 10-Gb/s terrestrial systems. All orders of PMD are considered by simulating the fiber using the coarse-step method, and a statistical approach is used to estimate the occasional fading of the signals. We show that pulses with lower duty-cycles perform better in general, and the system performance is improved if appropriate prechirping interacts with the residual chromatic dispersion of the fiber 相似文献
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本文对LD发光特性的非线性在高容量SCM光纤通信系统中所引起的互调干扰作了理论性的分析研究,导出了一些有关的计算公式,为高容量光纤通信系统的设计提供了一些理论方面的依据。 相似文献