共查询到19条相似文献,搜索用时 265 毫秒
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成功地使用粒子群优化(PSO)算法优化设计了多级S波段EDFA,仿真结果表明,输入信号功率为-20 dBm时在1486~1520 nm可实现平坦增益,两级泵浦总功率为380 mW,平均增益可达10 dB以上,增益平坦度小于0.1 dB,噪声系数小于5 dB,满足WDM/DWDM系统的需求.另外,还重点对插入长波长ASE... 相似文献
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《电子科技文摘》2001,(2)
0102148基于行列处理消除正向脉冲噪声非线性滤波器[刊]/陈树越//仪器仪表学报.—2000,21(5).—458~463(E)Y2000-62185-134 0102149掺铒光纤放大器的饱和参数=Saturation parameters ofErbium doped fibre amNifiers[会.英]/Mahdi,M.A.& Selvakennedy,s.//1998 IEEE International Confer-ence an Semiconductor Eleetronics.—134~137(E)对掺铒光纤放大器(EDFA)的增益、输入信号功率和输出功率的饱和参数进行了研究。对上述参数的了解将有助于设计 EDFA,使之作为功率放大器。对特定光纤长度和抽运功率的增益饱和、输出饱和功率、输入信号饱和功率给予了定义。参7 相似文献
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针对全光增益箝位EDFA噪声指数恶化以及用于WDM系统时增益动态变化两个问题,提出具有动态增益均衡特性的低噪声全光增益箝位EDFA,在35 nm范围内,输入信号功率在-40 dBm到0 dBm之间变化时,增益变化被箝制在1 dB范围内,同时保持单波长输入噪声指数<4.5 dB,多波长输入增益谱不平坦度<0.4,噪声指数<5.5 dB,有效解决了以上问题. 相似文献
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针对全光增益箝位EDFA噪声指数恶化以及用于WDM系统时增益动态变化两个问题,提出具有动态增益均衡特性的低噪声全光增益箝位EDFA,在35 nm范围内,输入信号功率在-40 dBm到0 dBm之间变化时,增益变化被箝制在1 dB范围内,同时保持单波长输入噪声指数<4.5 dB,多波长输入增益谱不平坦度<04,噪声指数<5.5 dB,有效解决了以上问题. 相似文献
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长距离DWDM系统中EDFA的研制 总被引:1,自引:0,他引:1
采用光纤光栅和增益平衡器等光无源器件 ,在常规掺铒光纤放大器 ( EDFA)内部引起光反馈和滤波整形机制 ,研制成功多信道动态增益均衡 EDFA,锁定工作波长带宽 17nm( 1544~1561nm) ,在输入功率 - 2 0~ - 5d Bm内增益恒定为 2 3d B,噪声系数小于 5d B,输出功率 18d Bm,并进行了 80 0 km× 8× 2 .5Gb/ s长距离 DWDM信号高速传输的实验研究 ,在信道数改变的动态运行情况下 ,系统误码率达 10 -10 。 相似文献
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第三部分EDFA的性能指标 EDFA的主要应用特性包括增益特性、输入输出特性、饱和特性、增益带宽特性和噪声特性等,它们与输入光功率大小、铒光纤长度及参数、泵浦功率大小及泵浦波长、信号波长等都有密切关系,本将分别介绍之. 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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建立了掺铒光纤放大器(EDFA)双向放大传输的方程,通过数值模拟计算,分析了掺铒光纤长度、泵浦功率的变化对增益、噪声系数的影响;研究了EDFA的正反向增益和噪声系数特性;给出了增益、正反向系数与输入信号功率的关系曲面。 相似文献
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We report an S-band erbium-doped fiber amplifier (EDFA) with a multistage configuration in terms of its design, gain, and noise characteristics for various pump powers and input signal powers, the temperature dependence of the gain spectra, and gain tilt compensation for changes in input signal power and temperature change. We show that there is a tradeoff between low noise and efficiency in the S-band EDFA and describe the development of an S-band EDFA with a flattened gain of more than 21 dB and a noise figure of less than 6.7 dB. We also show that there is a change in the gain spectra with changes in the pump power and input signal power that is different from that observed in C- and L-band EDFAs, and that our EDFA has a temperature-insensitive wavelength. Furthermore, we develop a gain tilt compensated S-band EDFA that can cope with changes in input signal power and temperature. 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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Experimental and theoretical analysis of the gain dynamics of all-optically stabilized multichannel erbium-doped fiber amplifier (EDFA) and the impact on wavelength division multiplexed (WDM) networks performance requirements is presented. In particular, we focus on precise analysis of the detailed transient response of the surviving channel and the relaxation oscillations of the compensating (lasing) signal. The main objective of this work is to experimentally and theoretically analyze and examine some of the critical factors such as, lasing wavelength, gain recovery time, relaxation oscillation frequency of the feedback loop, and the number of channels dropped/added, that affect the transient power excursions in the surviving channel. First, we consider the applicability of laser automatic gain control (AGC) to control fast power transients in WDM optical networks and reports the first high resolution measurements of transients in such gain controlled EDFAs. Second, the experimental results are compared with those predicted from a numerical simulation of the dynamic of the gain controlled EDFA 相似文献
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Seok Hyun Yun Bong Wan Lee Hyang Kyun Kim Byoung Yoon Kim 《Photonics Technology Letters, IEEE》1999,11(10):1229-1231
We describe the first demonstration of a dynamic erbium-doped fiber amplifier (EDFA) based on automatic feedback control of active gain equalizing filters. The filters are all-fiber acoustooptic tunable filters capable of generating controllable filter shapes. Wide dynamic-range gain/power control is achieved with <0.6-dB signal ripple over 30 nm in various operating conditions. We also show, by numerical simulation, an important advantage of the dynamic EDFA over a conventional EDFA in cascaded structures 相似文献
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Mahdi M.A. Poopalan P. Selvakennedy S. Ismail N. Ahmad H. 《Photonics Technology Letters, IEEE》1999,11(12):1581-1583
All optical gain-locking in an erbium-doped fiber amplifier (EDFA) is demonstrated. A double-pass superfluorescence is created by using a broad-band fiber reflector centered at 1530 nm at the output of the EDFA, to lock the gain at 21 dB. Experiments on an eight-channel wavelength-division-multiplexing system shows promise with gain variation between channels of less than 0.6 dB over the input signal power range. While, gain variation with input signal power is about 0.2 dB for all channels 相似文献
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Bumki Min Hosung Yoon Won Jae Lee Namkyoo Park 《Photonics Technology Letters, IEEE》2000,12(5):480-482
We propose a novel structure for C plus L-band silica based wide-band erbium-doped fiber amplifiers (W-EDFA's), which use backward amplified spontaneous emission from the C-band EDFA as the pump-mediating injection source for the L-band amplifier unit. Experimental results show gain and noise figure improvements of over 2.6 dB and 0.6 dB, respectively, at -3.5 dBm of L-band input signal power. Spatially resolved numerical analysis confirms the pump-mediating effect of C-band backward ASE in the L-band EDFA for the gain and noise figure improvement, which also provides better understanding on the dynamics of C-band injection seed methods 相似文献
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L-波段掺铒光纤放大器的优化设计 总被引:2,自引:0,他引:2
针对传统L-波段掺铒光纤放大器(EDFA)转换效率不高,提出了一种在未泵浦掺铒光纤的输入端插入一根布拉格光栅(FBG)的L-波段EDFA新结构。实验表明这种结构可以提高功率转换效率,小信号增益增加约3dB。基于考虑ASE噪声的Giles模型,建立了这种EDFA的理论模型,并运用数值模拟算法系统地分析了布拉格波长及其反射率等参量对放大性能的影响。 相似文献