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首页> 外文期刊>Optics Communications: A Journal Devoted to the Rapid Publication of Short Contributions in the Field of Optics and Interaction of Light with Matter >Distributed fiber Raman amplifiers: analytical expression of noise characteristics under complex conditions
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Distributed fiber Raman amplifiers: analytical expression of noise characteristics under complex conditions

机译：分布式光纤拉曼放大器：复杂条件下噪声特性的解析表达式

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摘要

Aiming at qualitative study, analytical expressions of equivalent noise figure (ENF) and other noise characteristics of distributed fiber Raman amplifier (DFRA) are derived, including difference in polarization state and attenuation coefficients between pump and signal light(s) as well as multiple-wavelength pumping. Impact of ENF and polarization factor on DFRA performance and optical signal-to-noise ratio improvement (ΔOSNR) of a cascaded DFRA+EDFA (erbium-doped fiber amplifier, EDFA) is investigated. With increasing DFRA on-off gain, ΔOSNR increases first linearly and then logarithmically, leading to saturation. Effects such as pump depletion by signal, pump-pump interactions and temperature dependence of noise are ignored. Analytical results agree fairly well with existing work. Based on these results, some guidelines on DFRA design is proposed.
机译：针对定性研究，推导了等效噪声系数（ENF）和分布式光纤拉曼放大器（DFRA）的其他噪声特性的解析表达式，包括泵浦和信号光之间的偏振态差异和衰减系数，以及多个波长泵浦。研究了ENF和偏振因子对级联的DFRA + EDFA（掺b光纤放大器，EDFA）的DFRA性能和光信噪比改善（ΔOSNR）的影响。随着DFRA开关增益的增加，ΔOSNR首先线性增加，然后对数增加，从而导致饱和。诸如信号引起的泵损耗，泵-泵相互作用以及噪声的温度依赖性等影响被忽略。分析结果与现有工作非常吻合。基于这些结果，提出了一些有关DFRA设计的准则。

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