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Noise in adaptive interferometric fiber sensor based on population dynamic grating in erbium-doped fiber

机译：掺population光纤中基于种群动态光栅的自适应干涉光纤传感器噪声

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Experimental investigations of the main noise sources that limit the sensitivity of the adaptive interferometric all-fiber sensors operating in the communication wavelength region are reported. Adaptive properties (i.e., the autostabilization of an optimal operation point of the interferometer) are enabled by the dynamic population grating recorded in a segment of the erbium-doped fiber (EDF) at milliwatt-scale cw power in the 1480-1560 nm spectral range. The utilized symmetric Sagnac configuration with low light internal reflections ensures reduced sensitivity of the sensor to phase noise of the laser, while intensity noise is reduced to an insignificant level by the balanced detection scheme. It is shown that the fluorescence from the erbium ions, excited by the counter-propagating waves recording the grating, increases the noise level from the fundamental shot noise approximately by a factor of 2-3 only. It is also shown that conventional communication distributed feedback (DFB) semiconductor lasers with megahertz linewidth are not suitable for high-sensitivity applications of such sensors. Because of inevitable backreflections from the output terminal devices (photodiodes, insulators, circulator), the above-mentioned fundamental noise level is increased by 2 orders of magnitude due to high phase noise of the DFB laser. (C) 2016 Optical Society of America
机译：报告了主要噪声源的实验研究，这些噪声源限制了在通信波长范围内工作的自适应干涉式全光纤传感器的灵敏度。通过在1480-1560 nm光谱范围内的毫瓦级连续波功率记录在掺ped光纤（EDF）的一段中的动态填充光栅，可以实现自适应特性（即，干涉仪的最佳工作点的自动稳定） 。所利用的对称Sagnac配置具有低的内部光反射，可确保传感器对激光相位噪声的灵敏度降低，同时通过平衡的检测方案将强度噪声降低到微不足道的水平。结果表明，来自recording离子的荧光在记录光栅的反向传播波的激发下，使基本散粒噪声的噪声水平仅增加了约2-3倍。还表明，具有兆赫兹线宽的常规通信分布式反馈（DFB）半导体激光器不适合此类传感器的高灵敏度应用。由于来自输出终端设备（光电二极管，绝缘体，环行器）的不可避免的背反射，由于DFB激光器的高相位噪声，上述基本噪声电平增加了2个数量级。 （C）2016美国眼镜学会

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