布里渊光纤环形放大器光噪声感知能力的实验研究

Hai Zhou, S. Cheng, Chung Yu
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引用次数: 0

摘要

实验研究了一种基于高增益布里渊光纤环形放大器的光噪声检测方案。传感机制是光纤中引导声本征模与外部馈电光信号的布里渊散射密切相关的结果。由于这些本征模的起源是热的和振动的,并且由于它们引起的光散射很弱,它们构成了以入射光信号频率为中心的宽带噪声源。布里渊光纤环形放大器被设计成当光纤受到机械和热性质的环境物理干扰时,能够接收光纤中的这种光噪声。通过对系统电源组、光纤布局和传感方案的合理设计,使系统具有良好的鲁棒性和容错性。与传统光纤传感器的单测量不同,噪声传感本质上是多测量的。因此,所提出的方案可以使传感更加经济。因此,本实验可行性研究将集中于探索由单激光器供电的双环布里渊光纤环形放大器的低噪声传感能力。第一个环产生斯托克斯波作为光纤中的噪声携带信号,而第二个环通过改变GeO/sub 2/掺杂产生波长略有移位的斯托克斯波,与斯托克斯信号足够远,不会放大。因此,后一环被设计为只放大布里渊噪声,其通常约为信号功率的6 × 10/sup -5/。光纤环的高增益和低内部噪声是这种独特的噪声放大器的重要特点。越来越多地在结构上使用嵌入式光纤来监测结构完整性,这促使了许多传感方案,但迄今为止还没有一种方案能够证明实际应用所需的鲁棒性和容错性。我们提出的传感方案有望填补这一空白。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental Investigation of the Optical Noise Sensing Capabilities of the Brillouin Fiber Ring Amplifier
An optical noise sensing scheme based on the high gain Brillouin fiber ring amplifier is investigated experimentally. The sensing mechanism is the result of the close relationship between the guided acoustic eigenmodes in the fiber and the resultant Brillouin scattering of an externally fed optical signal. Since these eigenmodes are thermal and vibrational in origin, and light scattering due to them is quite weak, they constitute a broadband noise source centered around the incident optical signal frequency. The Brillouin fiber ring amplifier is designed to have the capability to listen to such optical noise in the fiber, when the latter is subjected to ambient physical disturbances of a mechanical and thermal nature. By properly designing the system power pack, the fiber layout and sensing scheme, the proposed system can be robust and fault tolerant. Noise sensing is inherently multimeasurand, as opposed to traditional fiber-optic sensors, which are usually single-measurand. The proposed scheme can thus render sensing considerably more economical. This experimental feasibility study will thus concentrate on exploring the low noise sensing capability of the Brillouin fiber ring amplifier in a two-ring format, powered by a single laser. The first ring generates a Stokes wave to serve as the noise carrying signal in a fiber, while the second ring by varying GeO/sub 2/ doping generates a Stokes wave at slightly shifted wavelength, sufficiently apart from the signal Stokes as not to amplify it. The latter ring is thus designed to amplify only the Brillouin noise, which is normally about 6 x 10/sup -5/ of signal power. The high gain and low internal noise of the fiber ring are the promising features of this unique noise amplifier. The increasing usage of embedded fibers on structures to monitor structural integrity has prompted many sensing schemes, but none so far has demonstrated robustness and fault tolerance as required for practical application. Our proposed sensing scheme is expected to fill the gap.
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