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简要概述了掺铒光纤放大器(EDFA)的结构、原理,然后基于Optisystem建立了运用EDFA的水下信息网络的仿真模型,主要针对水下系统中EDFA的掺铒光纤长度和泵浦功率进行研究,综合分析得出在200 km水下信息网中,EDFA采用3 m掺铒光纤、70 m W前向泵浦能获得相对较好的传输性能。 相似文献
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时书丽 《光纤与电缆及其应用技术》2003,(5):8-9,35
阐述了掺铒光纤放大器的放大原理,给出了计算放大器增益和自发辐射噪声的公式,并且给出了增益和噪声与掺铒光纤长度、泵浦功率、输入信号功率之间的关系。 相似文献
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本文对低泵浦功率下1480nm泵浦的掺铒光纤放大器的特性进行了数值分析,分别给出了正,反向泵浦下大信号(1mW)输入时掺铒光纤放大器的增益-泵浦功率和噪声指数-泵浦功率曲线,说明了低泵浦功率对掺铒功率对掺期铒光纤放大器特性的影响。 相似文献
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A composite-EDFA configuration which incorporates an optical isolator has been investigated theoretically and experimentally. The isolator prevents the build-up of the backward-ASE and results in an amplifier with high gain and near-quantum-limited noise figure (NF). The optimum position of the isolator has been calculated as a function of the pump power so that minimum NF and maximum gain are achieved simultaneously. It is shown that under practical pump powers, the optimized composite EDFA exhibits a gain improvement of about 5 dB and a NF reduction in excess of 1.5 dB when compared with an optimized conventional EDFA. It is also shown that with further optimization the composite EDFA can be employed in a practical fiber link as a pre-amplifier without the use of an input isolator. Finally, a high-gain composite EDFA has been experimentally demonstrated which exhibits a gain of 51 dB (54 dB) and NF of 3.1 dB for only 435 mW (93 mW) of pump power 相似文献
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It is shown that for practical pump powers (<100 mW) a combination of high gain (>33 dB) and low noise figure (3 dB) cannot simultaneously be achieved with a conventional codirectionally pumped EDFA. However, using a codirectionally pumped composite EDFA incorporating an isolator overcomes the problem, and an amplifier with 51 dB (54 dB) gain and 3.1 dB noise figure (NF) for only 45 mW (93 mW) of pump power is demonstrated 相似文献
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The performance of a long wavelength‐band erbium‐doped fiber amplifier (L‐band EDFA) using 1530nm‐band pumping has been studied. A 1530nm‐band pump source is built using a tunable light source and two C‐band EDFAs in cascaded configuration, which is able to deliver a maximum output power of 23dBm. Gain coefficient and noise figure (NF) of the L‐band EDFA are measured for pump wavelengths between 1530nm and 1560nm. The gain coefficient with a 1545nm pump is more than twice as large as with a 1480nm pump. It indicates that the L‐band EDFA consumes low power. The noise figure of 1530nm pump is 6.36dB at worst, which is 0.75dB higher than that of 1480nm pumped EDFA. The optimum pump wavelength range to obtain high gain and low NF in the 1530nm band appears to be between 1530nm and 1540nm. Gain spectra as a function of a pump wavelength have bandwidth of more than 10nm so that a broadband pump source can be used as 1530nm‐band pump. The L‐band EDFA is also tested for WDM signals. Flat Gain bandwidth is 32nm from 1571.5 to 1603.5nm within 1dB excursion at input signal of –10dBm/ch. These results demonstrate that 1530nm‐band pump can be used as a new efficient pump source for L‐band EDFAs. 相似文献
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A. Altuncu A. Basgumus 《Photonics Technology Letters, IEEE》2005,17(7):1402-1404
Gain enhancement provided in L-band erbium-doped fiber amplifier (EDFA) with loop configuration and through C-band signal injection is experimentally demonstrated and compared with conventional single-stage L-band EDFA design. Significant backward amplified spontaneous emission suppression in C-band and pump conversion efficiency increase in L-band were observed for varying C-band seed signal wavelength and power levels. Gain and noise figure (NF) performance of loop design L-EDFA is compared with the conventional bidirectionally pumped single-stage L-EDFA design. Gain and NF measurements in the loop configuration have resulted in an up to 9.5-dB increase in gain and up to 2.6-dB degradation in NF at a moderate signal wavelength of 1585 nm. 相似文献
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《Electronics letters》2008,44(18):1082-1083
A novel low-noise extended L-band silicate erbium-doped fibre amplifier (EDFA) is proposed, consisting of two novel gain-flattened gain blocks for wavelength-division multiplexing (WDM) signals from 1562.2 to 1619.6 nm. Each gain block consists of three isolated phosphorus/ alumina co-doped silicate EDFs, an intermediate embedded gain flattening filter (GFF), a short wavelength pump laser diode, and a pump bypass and/or a recycle path. The proposed EDFA, which uses only three pump laser diodes, has achieved noise figures as much as 6.1 dB lower than those realised by an earlier EDFA, when its intermediate optical attenuator has large signal losses and the input signal power is low. 相似文献
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Improvement of gain and noise figure in double-pass L-band EDFA by incorporating a fiber Bragg grating 总被引:2,自引:0,他引:2
L.L. Yi L. Zhan J.H. Ji Q.H. Ye Y.X. Xia 《Photonics Technology Letters, IEEE》2004,16(4):1005-1007
An obvious improvement on both the gain and noise figure (NF) is demonstrated in the new double-pass L-band erbium-doped fiber amplifier (EDFA) with incorporating a fiber Bragg grating (FBG). Compared with the conventional L-band EDFAs, the gain is improved by about 6 dB in the new configuration for a 1580-nm signal with an input power of -30 dBm at 60 mW of 980-nm pump power. It is important that the NF is greatly reduced in the new configuration, as the FBG greatly compresses the backward amplified spontaneous emission. For the economical utility of pump power and erbium-doped fiber length, such a configuration may be a very competitive candidate in the practical applications of L-band EDFAs. 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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Bo-Hun Choi Hyo-Hoon Park Moo-Jung Chu 《Quantum Electronics, IEEE Journal of》2003,39(10):1272-1280
A long-wavelength-band erbium-doped fiber amplifier (L-band EDFA) using a pump wavelength source of 1540-nm band has been extensively investigated from a small single channel input signal to high-power wavelength division multiplexing (WDM) signals. The small-signal gain coefficient of 1545-nm pumping among the 1540-nm band is 2.25 times higher compared to the conventional 1480-nm pumping. This improvement in gain coefficient is not limited by the pumping direction. The cause for this high coefficient is explained by analyzing forward- and backward-amplified spontaneous emission spectra. The gain spectra as a function of a pump wavelength suggest that a broadband pump source as well as a single wavelength pump can be used as a 1540-nm-band pump. In the experiment for high-power WDM signals, the power conversion efficiency for 256 WDM channel input is 48.5% with 1545-nm pumping. This result shows more than 20% improvement compared with the previous highest value for the L-band EDFA. Finally, the 1545-nm bidirectionally pumped EDFA is applied as a second stage amplifier in an in-line amplifier of an optical communication link with a 1480-nm pumped first stage EDFA, in which the input power of the second-stage EDFA is +2.2 dBm. The power conversion efficiency yields a 38% improvement without noise figure degradation compared with the case of 1480-nm pumping. 相似文献
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Seo Yeon Park Hyang Kyun Kim Gap Yeol Lyu Sun Mo Kang Sang-Yung Shin 《Photonics Technology Letters, IEEE》1998,10(6):787-789
We demonstrate an erbium-doped fiber amplifier (EDFA) that has a flat-gain spectrum over an 18-nm band and a constant per-channel output power regardless of the input powers and the number of channels. The gain flatness and the constant output are obtained by changing the laser diode pump power and the attenuation of the voltage-controlled attenuator (VCA) dynamically. The response times of pump control circuit and attenuator control circuit are 650 ns and 9 ms, respectively. The power excursion of surviving channel in an EDFA with fast control circuit is ~1% of that without fast control circuit when channels are added or dropped 相似文献