共查询到18条相似文献,搜索用时 62 毫秒
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为解决传统拉曼放大器增益系数低和增益不平坦的问题,采用级联光子晶体光纤的设计方法设计了一种增益平坦的拉曼光纤放大器.采用受激拉曼散射效应的稳态分析理论,分析了光子晶体光纤的拉曼增益谱,建立了拉曼放大器的理论模型.通过解耦合方程,推导了实现增益平坦的约束条件,发现光纤长度和泵浦功率是影响拉曼光纤放大器增益平坦度的两个参数.仿真结果表明,在1 508~1 544 nm的带宽范围内,实现了一个增益高达21 dB,增益平坦度仅为0.14 dB的光子晶体拉曼光纤放大器,可在光纤通信系统应用中发挥重要作用. 相似文献
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为实现较大放大带宽,同时提高输出增益并保持较小的增益平坦度,设计了一种二阶拉曼光纤放大器,采用一个二阶泵浦和四个一阶泵浦对100路信号光进行分布式拉曼放大.首先对二阶拉曼耦合波方程进行数值求解,为进一步提高输出性能,利用粒子群优化算法对二阶拉曼光纤放大器的性能参数进行了优化,然后在相同泵浦参数配置下,对一阶拉曼光纤放大器和二阶拉曼光纤放大器进行对比,最后对二阶拉曼放大器输出增益的影响因素进行分析.通过Matlab仿真,在1 510~1 610 nm的增益带宽范围内所设计的二阶拉曼光纤放大器的平均输出增益为23.768 0 dB,最高输出增益为24.124 4 dB,同时增益平坦度为0.911 2 dB. 相似文献
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1410 nm波段分布式光纤拉曼增益放大器的研究 总被引:6,自引:2,他引:4
讨论了分布式光纤拉曼增益放大器的工作原理,采用1320nm固体激光器作为抽运源,获得了1410nm波段附近的光放大,在单模GI光纤长度为23km时,初步研究了拉曼放大器增益与光纤作用长度的关系,抽运脉冲峰值功率分别为50W、30W时,光纤的有效作用长度分别为15.5km和10.5km;研究了在不同的光纤有效作用长度时,拉曼放大器增益与抽运功率的关系;从光纤拉曼光谱图估算了光纤拉曼放大器的光谱宽度为50nm或250cm^-1。 相似文献
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提出了一种改进的、可用于计算偏振相关拉曼增益的光纤拉曼放大器的非线性耦合波方程。建立了单模双折射光纤拉曼增益的数学模型,分析了线偏振抽运光以与光纤快轴成45°激励的单模双折射光纤拉曼放大器模型与实际具有随机双折射的光纤拉曼放大器的拉曼增益偏振相关特性的等价性。基于上述模型,提出了一个可定量表征单模光纤偏振模色散统计特性的拉曼增益偏振相关因子,用以替代常规的光纤拉曼放大器非线性耦合波方程中的偏振相关因子。计算结果与已报道文献的实验数据非常吻合。同时对抽运增益在同向和反向抽运方式下截然不同的增益偏振相关特性给出了合理的解释。 相似文献
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A gain and gain-flatness improved L-band dual-pass Raman fiber amplifier (RFA) utilizing a photonic crystal fiber (PCF) as gain medium is demonstrated. By introducing complementary gain spectra of typical forward and backward pumping single-pass RFA using the same PCF, we finally achieve average net gain level of 22.5 dB with a ±0.8 dB flattening gain in 20-nm bandwidth from 1595 nm to 1615 nm, which is rare in RFAs with only one single pump and no flattening filter. Compared with the single-pass pump configurations, gain level, flatness and bandwidth are greatly improved by using the dual-pass amplification configuration. The limitation of this configuration caused by multi-path interference (MPI) noise and stimulated Brillouin scattering (SBS) is also discussed. 相似文献
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Stimulated Raman scattering in a double cladding optical fiber is studied with a continuous wave laser used as a pump source. Under various launch conditions, pump modes are differently excited. Considering the mode coupling effect among the pump modes, the evolution of the power in the Stokes modes is studied. The results show that the scattered waves (the Stokes waves) in the fiber core with 9%tm diameter and 0.14 NA could propagate predominantly in the fundamental mode of the fiber by carefully adjusting the pump light launching conditions. 相似文献
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In a distributed Raman fiber amplifier (DRFA), Raman amplification allows a lower signal launch powers to transverse the span above the noise floor while still increasing the optical signal-to-noise ratio (OSNR). It improves the noise figure and reduces the nonlinear penalty of fiber systems. In this paper, we demonstrate a new trend of OSNR at different pump configurations: forward, backward and bidirectional pumping for DRFAs as a function of fiber length. We also present the variation of OSNR with both input pump power and input signal power. It is found that forward pumping provides the highest OSNR, reaching its maximum value of 37 dB. However, backward pumping provides the smallest OSNR that has its maximum of 22 dB and the bidirectional pumping provides the moderate OSNR between the others having its peak of 26 dB. 相似文献
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本文进行了1031 nm抽运光对1080 nm单频信号光的拉曼放大实验,详细研究了单频信号光种子功率、拉曼增益光纤长度、抽运方式等因素对 单频光纤拉曼放大器(SF-FRA)输出特性的影响.结果表明,在未受受激布里渊散射(SBS)因素限制时,相同抽运功率条件下,单频信号光种子功率越高,SF-FRA的效率越高;拉曼增益光纤越长,SF-FRA的效率越高;前向抽运时,SF-FRA的效率较高.实验中发现SF-FRA的拉曼放大过程对单频信号光的线宽有较小的展宽.此外,单频信号光远场干涉短曝光图像的对比度为0.814,单频信号光与SF-FRA放大光远场干涉短曝光图像可见度为0.719,表明SF-FRA对单频信号光的相干性有一定影响.实验结论可为其他特殊波长SF-FRA的设计提供一定的参考. 相似文献
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