共查询到19条相似文献,搜索用时 125 毫秒
1.
双包层Er—Yb共掺光纤放大器的特性分析 总被引:5,自引:0,他引:5
基于速率方程,数值分析了在980nm泵浦下双包层Er-Yb共掺光纤放大器的输出信号功率、增益和噪声特性;讨论了它们随激活光纤长度、输入泵浦功率和输入信号功率关系。结果表明,在小信号情况下,长度为5m的双包层Er-Yb共掺光纤放大器的输出信号功率超过25dBm,增益高于30dB,噪声系数小于4dB。 相似文献
2.
为了研究不同增益光纤长度下1555nm高功率光纤放大器的输出功率,采用两级混合结构的方法,用掺铒光纤放大器和双包层铒镱共掺光纤放大器分别作为1级预放大器和2级主放大器。掺铒光纤放大器对信号光进行预放大,并提高放大器的信噪比;双包层铒镱共掺光纤放大器为主放大器,其双包层结构可以把更多的多模抽运光耦合进系统。对铒镱共掺光纤的最佳长度做了理论分析和实验验证,在信号光功率为10mW、掺铒光纤放大器的抽运功率为318.58mW、双包层铒镱共掺光纤放大器的抽运功率为11.71W、增益光纤长度为14m时,输出功率取得了2.11W的实验数据。在分析输出信号光谱时发现,L波段附近有放大自发辐射谱出现,这是选择的增益光纤过长导致的。结果表明,在光功率和信号光功率一定时,光纤放大器有一个最佳的光纤长度。这一结果对研究光纤放大器的高功率输出是有帮助的。 相似文献
3.
通过对普适于不同内包层边界条件下的热传导方程进行推导和求解,得到了不同内包层形状的双包层增益光纤所对应的掺铥光纤放大器的三维热分布。计算结果表明,双包层光纤不同内包层形状可导致纤芯处的温度差高达107 K。同时,信号光与泵浦光功率的比值决定了温度最高点和熔接点的距离,在泵浦光功率为100 W、信号光功率为10 mW的情况下,两者之间的距离可达30 cm。通过分析不同内包层形状的双包层光纤的径向与轴向的热分布情况发现,相较于其他内包层形状的双包层光纤,偏芯型双包层掺铥光纤因其具有较低的最高温度、较高的泵浦效率和高斯型横截面热分布而较适用于掺铥光纤放大器。 相似文献
4.
5.
6.
7.
为满足高功率激光系统末级功率提升的要求,研制了高功率光纤放大器,它采用双包层掺Yb3+光纤作为增益介质,利用泵浦合束器进行泵浦的级联放大。通过有效的热管理及输出稳定技术,对于大信号1053nm波长的输入光,该光纤放大器的增益大于22dB;采用增益均衡技术,20nm带宽范围内增益平坦度小于2dB。 相似文献
8.
9.
10.
11.
分布拉曼光纤放大的实验研究 总被引:1,自引:1,他引:1
采用符合ITU-T标准的G波段40信道波分复用(WDM)光源对分布式拉曼放大器(DRA)的特性进行了实验研究。对不同抽运方式及不同光纤长度的分布式拉曼放大器性能作了较为详细的报道。在抽运功率相同的条件下,选用50km单模光纤对比研究了不同抽运方式的拉曼放大器增益和噪声。通过对不同光纤长度的分布式拉曼放大器的实验研究发现,在较低抽运功率且输入信号功率较低的情况下,随着光纤长度增加,拉曼增益也增加,有效噪声系数减小。研究了分布式拉曼放大器对波分复用通信系统信噪比的改善,实验发现不同抽运功率下,拉曼放大器对系统信噪比的改善随抽运功率增加而增加,但是不成线性关系,而且最终会出现饱和。 相似文献
12.
E. Desurvire 《Photonics Technology Letters, IEEE》1991,3(7):625-628
An accurate model for erbium-doped fiber amplifiers with fiber background loss applicable to the unsaturated gain regime is presented. Exact analytical solutions are derived for the output pump power, gain, and amplified spontaneous noise as a function of input pump power in the cases of unidirectional or bidirectional pumping. An exact relation is also derived between the pump threshold and the pump required for fiber transparency. Such expressions are particularly useful to model distributed fiber amplifiers and to determine the optimal fiber parameters corresponding to a given pumping scheme. As an example, the analytical solutions are used to study the pump power requirement for distributed fiber amplifiers unidirectionally pumped at 1.48 mu m, and to determine an optimum Er/sup 3+/ absorption coefficient.<> 相似文献
13.
Habbab I.M.I. Saleh A.A.M. Frigo N.J. Bodeep G.E. 《Lightwave Technology, Journal of》1992,10(9):1281-1289
The overall gain of a chain of erbium-doped fiber amplifiers in a long-haul all-amplifier system would be automatically stabilized if each amplifier were operated slightly into saturation. However, with the required low level of amplifier output power which is imposed by nonlinearity in the transmission fiber, the resulting pump power becomes too low to effectively invert the gain medium of the amplifiers. Consequently, the amplifier output noise level becomes too high for proper system operation. This problem is solved by pumping the amplifiers harder so that a higher gain and higher output power are achieved. The excess gain is then counteracted by an appropriate value of post-amplifier loss. Because of the higher pump power in this case, the amplifier noise is reduced significantly. This technique is investigated theoretically, and experimental work that verifies it is reported 相似文献
14.
S.P. Bastien H.R.D. Sunak 《Photonics Technology Letters, IEEE》1991,3(9):825-828
Using a comprehensive computer model, it was shown that the effects of excited state absorption (ESA), in the 800 nm pump band, in alumino-phosphate-silicate (APS) erbium-doped fiber amplifiers (EDFAs) can be reduced significantly by using bidirectional pumping. If a band optimum length (BOL) is selected, a near optimum small signal gain (SSG) can be constant over broad pump wavelength regions due to the combined effects of ESA and ground state absorption (GSA). Hence, multilongitudinal mode, high power, reliable and inexpensive GaAlAs laser diodes can be used as pumping sources for EDFAs having SSG > 40 dB, noise figures of <4 dB, and output signal powers approaching 100 mW. These fibre amplifiers could be used as line repeaters, preamplifiers, and power amplifiers in different lightwave systems.<> 相似文献
15.
A two-level model of the erbium-doped fiber amplifier is used to analyze the dependence of the amplifier gain saturation, saturated output power, and excess noise factor on pump and signal wavelengths. Measured data are presented confirming that the dependence of the gain, output saturation power, and noise of erbium-doped fiber amplifiers on the signal and pump wavelength can be described by simple equations derived from the model 相似文献
16.
1053 nm掺Yb3+双包层光纤放大器脉冲放大特性研究 总被引:2,自引:1,他引:2
从掺Yb^3+光纤放大器(YDFA)的功率传输方程出发,采用有限差分法对掺Yb^3+双包层光纤放大器在1053nm的脉冲放大特性进行数值分析。模拟计算了在977nm前向抽运下,光纤放大器中的上能级粒子数,抽运光和放大自发辐射(ASE)在光纤中的稳态分布。分析了掺Yb^3+双包层光纤放大器的单脉冲波形畸变以及控制输入脉冲形状来产生需要的超高斯输出脉冲形状。讨论了最佳长度以及抽运方式差别等问题。 相似文献
17.
双包层光纤放大器小信号时放大的自发辐射特性研究 总被引:6,自引:0,他引:6
基于速率方程,针对不同的泵浦方式,对双包层Er^3+/Yb^3+共掺光纤放大器小信号放大时放大的自发辐射(ASE)特性进行了全面研究。研究结果表明:反向泵浦时,ASE+输出功率大于ASE-输出功率,各波长分量对ASE+输出功率的贡献大于该波长分量对ASE-输出功率的贡献;增加纤芯数值孔径,无论正向泵浦还是反向泵浦,ASE输出功率都单调减小;当包层对芯径面积之比小于某一特定值时,对于反向泵浦,ASE+输出功率大于ASE-输出功率。这些特点显示了小信号放大时ASE与大信号放大时ASE所存在的差异。 相似文献
18.