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利用平均反转率迭代算法计算掺镱双包层光纤放大器分布泵浦方式下的稳态速率方程组,并采用遗传算法对分布泵浦功率的大小和每段光纤长度同时进行优化。评估函数中引入了每段光纤中最高温度的标准方差,以确保每段光纤中的最高工作温度是相同的。通过优化,7段泵浦的最高温度和标准方差分别为126.34 ℃和1.95 ℃ ,8段泵浦条件下的最高温度和标准方差分别为119.76 ℃和2.12 ℃。而未经优化的7段泵浦的最高温度和标准方差分别为147.12 ℃和21.37 ℃,8段泵浦条件下的最高温度和标准方差分别为139.95 ℃和20.83 ℃。计算结果表明:泵浦方式的优化降低了最高温度和标准方差,实现了光纤中温度分布的均匀性,并且通过增加泵浦段数可以进一步降低最高温度和平坦温度分布。 相似文献
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The system of L-band 2×10 Gb/s WDM transmission over conventional single mode fibre with 600 km by chirped fibre Bragg gratings dispersion compensation 下载免费PDF全文
A chirped fibre Bragg grating according to ITU-T suggested L-band
(2nd channel $\lambda _{1}=1570.83$~nm; 80th channel $\lambda
_{2}=1603.57$ nm) with more than 1800 ps/nm single channel dispersion
compensation is presented in this paper, of which the cladding mode
loss, the delay curve ripple and the power fluctuation of the
reflected spectrum are less than 0.5 dB, 50 ps and 0.25 dB,
respectively. With this new FBG as dispersion compensation device, a
$2\times 10$ Gb/s wavelength division multiplexing (WDM) L-band
transmission of 600 km based on conventional single mode fibre (G.652
fibre) is performed without forward error correction. The bit error
rate (BER) is less than 10$^{ - 12}$ and the power penalties of the
2{nd} and 80{th} channel of L-band are 1.8~dB and 2.0~dB,
respectively. 相似文献
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同时考虑接收光信噪比(OSNR)及非线性失真影响,对分布式光纤拉曼放大器在长距离光传输系统中的最优抽运方式进行了研究.利用变分法原理获得了在不记双瑞利背散射(DRB)影响时的最优信号功率分布函数——均匀分布,但考虑双瑞利散射影响时则不存在解析的最优分布函数.在分别考虑长、短光纤跨距的情况下,比较了三种具有代表性的分布式光纤拉曼放大方式,即双向二阶拉曼抽运、双向一阶拉曼抽运和拉曼+掺铒光纤放大器混合放大方式的性能.指出通过优化一阶抽运波长以及一阶到二阶抽运功率比,对称结构的双向二阶抽运在绝大部分情况下可以在
关键词:
光纤拉曼放大器
双瑞利背散射
变分法
光纤非线性 相似文献
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Suppression of the interactions between fibre gratings used as dispersion compensators in dense wavelength-division multiplexing systems 下载免费PDF全文
Chirped fibre Bragg gratings (CFBGs) are required to be concatenated to compensate
the fibre dispersion in the dense wavelength-division multiplexing (DWDM) systems.
When the channel spacing is small, the performance of CFBGs is degraded, which
restricts the usage of fibre gratings. The origin of the interactions between the
gratings is analysed and methods of suppressing the interactions are also proposed. 相似文献
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环境折射率变换对长周期光栅特性影响的研究 总被引:2,自引:0,他引:2
将长周期光纤光栅简化为三层阶跃折射率波导结构,采用弱导标量近似和泄漏模式的概念结合耦合模理论较全面地、定量地分析了环境折射率变化对长周期光纤光栅谐振峰位置和深度等特性的影响,获得了一些有益的结论,与实验符合得很好。 相似文献
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