共查询到19条相似文献,搜索用时 78 毫秒
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DWDM用增益平坦EDFA研究 总被引:1,自引:0,他引:1
本文阐述了DWDM系统对EDFA的要求和EDFA为达到这些要求的几种实现方法。并给出了DWDM用EDFA级联和增益锁定的实验结果。 相似文献
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本文综述EDIFACT文电系统的安全,描述了EDI文电安全威胁以及保护EDIFACT文电的安全服务,介绍了EDIFACT的文电级安全及可采用的安全技术,最后概述EDIFACT的安全实现。 相似文献
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掺铒光纤放大器噪声特性的全面分析 总被引:1,自引:1,他引:1
本文对掺铒光纤放大器(EDFA)的噪声特性进行了全面的分析。把光信号和EDFA中放大自发辐射(ASE)产生的量子噪声,以及信号-ASE拍频噪声和ASE-ASE拍频噪声一并加以考虑。通过数值模拟,给出了不同信号功率和泵浦功率下的EDFA噪声系数。这些结果对优化EDFA的工作参量及其工程制作具有一定的指导作用。 相似文献
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掺铒光纤放大器特性分析及长度优化设计 总被引:1,自引:0,他引:1
掺饵光纤放大器(EDFA)是光纤通信系统中的关键器件之一。文中从EDFA的基本理论出发,对EDFA的各种特性进行了计算机模拟分析,并研究了EDFA的长度优化设计,实验结果与理论计算相吻合。 相似文献
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介绍了掺饵光纤放大器(EDFA)的原理、组成结构和所用元器件,阐述了EDFA的增益、噪声和增益谱特性,并对EDFA应用于波分复用(WDM)系统中带来的增益谱平坦问题进行了讨论。 相似文献
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EDFA对不同波长的光产生的增益不同,在EDFA级联的WDM 系统中,这种增益不平坦(不同)的特性严重地影响着系统的性能,所以EDFA的增益均衡显得尤为重要。文中介绍了WDM 光纤通信中对EDFA增益的不平坦进行均衡的几种方法,并对其进行了比较 相似文献
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本文首次提出了泵浦反射型的EDFA结构、理论计算表明,泵浦反射型EDFA较之常规型EDFA有高的泵浦效率,高的3dB压缩饱和输出功率,低的泵浦阈值,同时由于采用光纤Bragg光栅作反射器,使这种泵浦反射型EDFA在工艺上容易实现。 相似文献
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EDFA在模拟CATV中的应用及其对系统性能的影响 总被引:3,自引:1,他引:2
阐述掺饵光纤放大器(EDFA)的工作原理及其在CATV系统中的应用,并着重讨论了EDFA对由EDFA+DWDM组成的CATV多波长模拟系统性能的影响及其解决措施。 相似文献
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Bo-Hun Choi Hyo-Hoon Park Moojung Chu Seung Kwan Kim 《Photonics Technology Letters, IEEE》2001,13(2):109-111
A 1530-nm band has been studied as a pump wavelength for the long-wavelength-band erbium-doped fiber amplifier (L-band EDFA). The pump source is built using a tunable light source and cascaded conventional-band (C-band) EDFA. The L-band EDFA uses a forward pumping scheme. Within the 1530-nm band, the 1545-nm pump demonstrates 0.45-dB/mW gain coefficient, which is twice better than that of conventional 1480-nm pumped EDFA. The noise figure of the 1530-nm pump is at worst 6.36 dB, which is 0.75 dB higher than that of the 1480-nm pumped EDFA. Such high-gain coefficient indicates that the L-band EDFA consumes low power 相似文献
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The performances of radio on fiber (RoF) systems with a dual-electrode Mach-Zehnder modulator and an erbium-doped fiber amplifier (EDFA) are optimized by numerical equations including the third order intermodulation (IM3) as well as amplified spontaneous emission (ASE) noise. We investigate a signal-to-noise-and-distortion ratio (SNDR) considering fiber dispersion with respect to an input signal power and an EDFA gain in both noise-dominant and third order intermodulation (IM3)-dominant cases. We also verify that the numerical analysis results are well matched with those of a commercial simulator, VPItransmissionMaker. In the analysis results, the optimum input signal power for the maximum SNDR of a RoF system with EDFA was reduced over 8 dB compared with that without EDFA. The dramatic reduction of IM3 power at a receiver was resulted from this decrement of input signal power. Thus, the maximum SNDR of the system with EDFA was obtained over 17 dB at 40 km fiber compared with that of the system without EDFA. In addition, the results showed that the SNDR was efficiently improved by EDFA in the noise-dominant case, while the SNDR improvement was negligible by EDFA in the IM3 dominant case. 相似文献
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MSA增益可调EDFA在WDM系统中的应用 总被引:1,自引:0,他引:1
文章介绍了中间级接入(MSA)的概念和带有MSA功能的增益可调掺铒光纤放大器(EDFA)的原理及性能,详细分析了增益可调EDFA在密集波分复用(DWDM)系统中的应用场合以及多种性能表现,与传统固定增益EDFA相比,增益可调EDFA所具有的优点,并预测了带MSA功能的增益可调EDFA的应用前景. 相似文献
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M. Yamada H. Ono T. Kanamori T. Sakamoto Y. Ohishi S. Sudo 《Photonics Technology Letters, IEEE》1996,8(5):620-622
We propose a novel low noise and gain-flattened Er/sup 3+/-doped fiber amplifier (EDFA) with a cascade configuration for wavelength division multiplexing (WDM) signals. In this configuration, a 1480-nm pumped fluoride-based EDFA is joined to a 980-nm pumped silica-based EDFA through an optical isolator. By adjusting the silica-based Er/sup 3+/-doped fiber length in the silica-based EDFA, we realized an excellent flat gain EDFA with a gain excursion of less than 0.9 dB and noise figure of 5.7/spl plusmn/0.2 dB, and a low noise EDFA with a noise figure of 5/spl plusmn/0.2 dB and a gain excursion of less than 1.4 dB, for 8 channel WDM signal in the 1532-1560-nm wavelength region. 相似文献
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通过引入一个描述掺饵光纤放大器(EDFA)受扰后偏离其常态程度的参数Xi,本文推导出一个不依赖于具体参数的归一化的EDFA增益表达式。应用该式进行分析的结果表明,以Xi作为衡量系统恢复程度的参数,具有简便易行等优点。对于EDFA饱和程度较浅的陆上光纤通信系统而言,系统经3dB的扰动后,光功率在3级内即可恢复到原值的90%。扰动引起的系统误码率(BER)的变化,随扰动开始级数的不同而显著不同:前几级 相似文献
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