Intrinsic crosstalk analysis of a serial TDM FGB sensor array by using a tunable laser
Intrinsic crosstalk analysis of a serial TDM FGB sensor array by using a tunable laser
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DOI：
10.1109/leos.2000.893951
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发表时间：
2000-11
期刊：
影响因子：
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通讯作者：
C. Chan;W. Jin;D. Wang;M. Demokan
中科院分区：
文献类型：
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作者：
C. Chan;W. Jin;D. Wang;M. Demokan
光纤布拉格光栅（FBG），其波长编码的性质和他们的能力，已被证明为一些传感应用，特别是在智能结构的应变测量。最近，人们对使用可调谐激光器来询问串联拓扑中的FBG传感器以提高信噪比以及在单个光纤中使用TDM或WDM和TDM技术的组合来复用大量传感器产生了兴趣。然而，在使用串行拓扑中存在一些缺点，因为来自FBG的在时间上分离但在波长上重叠的反射光信号可能经历串扰，称为“光谱阴影”和“多次反射”。这些类型的串扰是固有的，并且会限制波长检测的准确性和阵列中传感器的数量。我们报告我们最近的理论研究和计算机模拟的结果。
Fiber Bragg gratings (FBGs), with their wavelength-encoded nature and their capacity for been demonstrated for a number of sensing applications, especially for strain measurements in smart structures. Recently, there has been interest in using tunable lasers for interrogating FBG sensors in serial topology for improving signal to noise ratio and for multiplexing a large number of sensors using TDM or a combination of WDM and TDM techniques in a single optical fiber. However, there are some drawbacks in using a serial topology because the reflected light signals from FBGs separated in time but overlapping in wavelength can experience crosstalk, termed "spectral shadowing" and "multiple reflection". These kinds of crosstalks are intrinsic and would limit the accuracy of the wavelength detection and the number of sensors in the array. We report the results of our recent theoretical investigation and computer simulations.