Modulation instability in a nonlinear dispersive fiber cavity including stimulated Raman scattering

J. Garcia-Mateos, F. Canal, M. Haelterman
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Abstract

Modulational instability (MI) involves the growth of initially weak sidebands at the expense of a continuous wave. The existence of MI in the anomalous group-velocity dispersion regime of an optical fiber is well known [1]. Modulation instability in a synchronously pumped fiber loop was recently predicted even in the normal dispersion regime [2] and has been proposed as the mechanism to generate pulses in the modulational instability laser [2,3]. On the other hand, modulation instability in cavityless propagation has been used as seed for later Raman ultrashort pulse generation [4]. In the present work, we analyze the role played by stimulated Raman scattering in the modulational instability dynamics of a synchronously driven fiber cavity. Starting from this study, we propose applications of our device as a low threshold Raman amplifier and as a modulation instability Raman laser.
包含受激拉曼散射的非线性色散光纤腔中的调制不稳定性
调制不稳定性(MI)涉及以牺牲连续波为代价的初始弱边带的增长。在光纤的异常群速度色散区中,MI的存在是众所周知的。最近预测了同步泵浦光纤环路中的调制不稳定性,甚至在正常色散状态[2]中也是如此,并提出了调制不稳定性激光器产生脉冲的机制[2,3]。另一方面,无腔传输中的调制不稳定性为后期拉曼超短脉冲的产生提供了种子。在本工作中,我们分析了受激拉曼散射在同步驱动光纤腔的调制不稳定动力学中的作用。从这项研究开始,我们提出了我们的器件作为低阈值拉曼放大器和调制不稳定拉曼激光器的应用。
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