Superlinear growth of Rayleigh scattering-induced intensity noise in single-mode fibers
Superlinear growth of Rayleigh scattering-induced intensity noise in single-mode fibers
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DOI：
10.1364/oe.23.006400
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发表时间：
2015-03-09
期刊：
影响因子：
3.8
通讯作者：
Carter, Gary M.
中科院分区：
文献类型：
--
作者：
Cahill, James P.;Okusaga, Olukayode;Carter, Gary M.
瑞利散射在单模光纤中传播的光载波附近产生强度噪声。这种噪声会降低光电振荡器和射频光子链路的性能。当使用宽线宽激光器时，我们之前发现强度噪声功率与光功率和光纤长度成线性比例，这与自发极限下的引导熵模瑞利散射（GEMRS）（一种三阶非线性散射过程）一致。在这项工作中，我们表明，使用窄线宽激光器时，这种行为会发生显着变化。使用窄线宽激光器，我们测得强度噪声平台的带宽为 10 kHz。我们发现，在 500 Hz 至 10 kHz 的频率范围内，散射噪声功率随光纤长度呈超线性变化，直至长度达到 10 km，而在 10 Hz 至 100 Hz 的频率范围内则呈线性变化。这些结果表明，瑞利散射引起的强度噪声不能像先前假设的那样用自发极限中的三阶非线性散射来解释。 (C) 2015年美国光学学会
Rayleigh scattering generates intensity noise close to an optical carrier that propagates in a single-mode optical fiber. This noise degrades the performance of optoelectronic oscillators and RF-photonic links. When using a broad linewidth laser, we previously found that the intensity noise power scales linearly with optical power and fiber length, which is consistent with guided entropy mode Rayleigh scattering (GEMRS), a third order nonlinear scattering process, in the spontaneous limit. In this work, we show that this behavior changes significantly with the use of a narrow linewidth laser. Using a narrow linewidth laser, we measured the bandwidth of the intensity noise plateau to be 10 kHz. We found that the scattered noise power scales superlinearly with fiber length up to lengths of 10 km in the frequency range of 500 Hz to 10 kHz, while it scales linearly in the frequency range of 10 Hz to 100 Hz. These results suggest that the Rayleigh-scattering-induced intensity noise cannot be explained by third-order nonlinear scattering in the spontaneous limit, as previously hypothesized. (C) 2015 Optical Society of America