共查询到19条相似文献,搜索用时 135 毫秒
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介绍了波分复用网络中EDFA高可靠增益控制与电压监测的差错检测方案.EDFA增益与输出电压通过监测控制信道电压来实现控制.功率检测中采用功率稳定的控制信道可以正确检测传输系统中的错误. 相似文献
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全光网节点规模的分析 总被引:1,自引:0,他引:1
导出了光信噪比与光节点数量 ,掺铒光纤放大器 (EDFA)噪声系数 ,增益的关系公式 ,并分析了光节点数目与EDFA特性参数的关系。分析表明 ,当光节点中EDFAs设置成输入EDFA补偿节点损耗 ,输出EDFA补偿光纤损耗的工作方式时 ,要保持光信号的信噪比不低于 2 0dB ,则光节点数目最多为 19左右 ,改善EDFA的噪声系数对提高光节点数目的作用不大 ;如降低光节点内部损耗 ,优化两个EDFA的增益 ,可以最大程度地提高网络节点规模 ,网络节点数最大可达 5 6。 相似文献
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综合分析了WDM系统中掺铒光纤放大器(EDFA)的主要性能指标,以及内外部工作条件的关系,讨论了有关EDFA的动态增益锁定与平坦机制。提出了更加优化的WDM系统中EDFA的自动增益控制的解决方案,并设计相关了试验,给出了采用本方案实现EDFA动态增益控制的分析结果。最后,指出了各种科技产品的问世,为EDFA的自动增益控制研究提供了更加广阔的思路和便利的条件。 相似文献
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在波分复用(WDM)通信系统中,由于上下载而导致信道数目的变化,引起光功率随时间变化,从而各信道通过EDFA后的增益也将发生变化,产生功率瞬态波动和交叉增益调制。特别是在级联的EDFA放大系统中,对EDFA的增益控制显得尤为重要。本分析比较了几种常见的掺铒光纤放大器自动增益控制技术。 相似文献
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C-band EDFA级联及增益锁定 总被引:1,自引:0,他引:1
从输出光功率、信号增益、噪声指数等几个方面分析了 C- band全带 EDFA的特性 ,并针对 DWDM系统对 EDFA的各项指标如噪声指数、输出功率、增益锁定、增益平坦等的要求 ,着重分析 EDFA级联后对系统的影响 .实验结果为 :对 32波 DWDM系统 ,EDFA6级级联模拟 5× 2 5d B传输实验 ,增益平坦度为 3.5d B,光信噪比 >2 7d B,信道增减造成增益变化 <0 .6d B. 相似文献
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利用Optisystem软件建立EDFA系统,对EDFA增益的影响因素进行了分析.通过系统仿真分析,根据影响EDFA增益的因素,确定影响EDFA增益的最佳因素参数,验证了EDFA仿真系统的正确性和设计方案的可行性,更加准确地得到最佳优化设计方案. 相似文献
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An EDFA gain control and power monitoring scheme for fault detection in WDM networks by employing a power-stabilized control channel 总被引:1,自引:0,他引:1
Schemes are proposed for the highly reliable gain control of erbium-doped fiber amplifiers (EDFAs) and for power monitoring to detect faults in wavelength-division-multiplexing (WDM) networks. These schemes employ one WDM channel (a control channel). The EDFA gain and output power levels are controlled by monitoring the control channel power that is automatically controlled and stabilized in the node. This prevents the uncontrolled EDFA operation that might result from any serious change in the control channel power. The use of a power stabilized control channel for power monitoring makes it possible to detect transmission system faults correctly because the monitoring of the control channel power is unaffected by the amplified spontaneous emission (ASE) generated in the EDFA. We also report experimental results on the dependence of the transient response of the EDFA gain and output power on the signal channel power and channel number input into the EDFA, when the power of the control channel changes due to problems with its light source. Numerical calculation of the gain transience explains the experimental results. 相似文献
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A. Bianciotto A. Carena V. Ferrero R. Gaudino 《Photonics Technology Letters, IEEE》2003,15(10):1351-1353
Er-doped fibre amplifier (EDFA) gain transients are dynamic performance-degrading effects that need to be effectively suppressed in next-generation reconfigurable optical networks. In this paper, we experimentally assess the feasibility of an electronic dynamic gain control based on low-cost optoelectronic components, showing that a linearized electrical circuit and a control bandwidth smaller than 1 MHz can achieve the same performance as the commonly proposed all-optical feedback solutions. 相似文献
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Transmitting optical bursts through a chain of erbium-doped fiber amplifiers (EDFAs) results in dynamic gain changes, which in turn lead to possibly large variations in output power of the data channels. There are many proposals how to control these optical amplifiers in order to minimize or eliminate the power variations. In this paper, we investigate the gain dynamics in a burst switching environment experimentally and numerically. With a categorization of gain control schemes we review the state of the art and discuss advantages and disadvantages of the different approaches particularly with regard to burst switching networks. A comparison of the performance of these methods is given. In our opinion there are two preferences, one for the scheme using electronic feedback on the EDFA's pump power, because of good performance, and another for schemes controlling whole links of EDFA cascades by an extra control channel, because of lower costs. 相似文献
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Sun Hyok Chang Hee Sang Chung Hyun Jae Lee Kwangjoon Kim 《Photonics Technology Letters, IEEE》2005,17(5):1004-1006
Transient phenomena of hybrid Raman/erbium-doped fiber amplifier (EDFA) upon optical channel add-drop are investigated. The transient responses of surviving channels are resulted from the combined dynamics of Raman amplifier and EDFA. It is shown that the suggested method employing fast gain control of EDFA only can effectively suppress the transient variation of output power. The transient-suppressing hybrid Raman/EDFA is proven to be enough for wavelength-division-multiplexing networks including reconfigurable optical add-drop multiplexer and/or transparent optical cross-connect, if the optical switching speed is carefully chosen. 相似文献
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In this letter, we demonstrate a technique for suppression of transients in output bursts of an erbium‐doped fiber amplifier (EDFA) in an optical burst network. To suppress the transients, the EDFA is forward‐fed by non‐fluctuating input utilizing a power‐modulated burst control packet channel. Using the technique, we obtained a maximum 1.7 dB reduction in gain transient in the EDFA output, and we transmitted 9.953 Gbps data bursts and 2.488 Gbps burst control packets stably. 相似文献
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掺铒光纤放大器的偏振相关增益是导致放大器增益不平坦的一个重要原因,进而影响长距离光纤通信系统、长距离光纤传感系统的信号质量.本文从理论模拟角度研究了级联掺铒光纤放大器的偏振相关增益对光纤中所传输通信光信号的影响.重点研究了掺铒光纤非均匀展宽情况下,偏振相关增益受传输信号功率、信道个数、级联EDFA个数、等因素的影响,并给出了定性结论. 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