All-fiber spectrometer based on speckle pattern reconstruction
All-fiber spectrometer based on speckle pattern reconstruction
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DOI：
10.1364/oe.21.006584
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发表时间：
2013-03-11
期刊：
影响因子：
3.8
通讯作者：
Cao, Hui
中科院分区：
文献类型：
--
作者：
Redding, Brandon;Popoff, Sebastien M.;Cao, Hui
在校准由光纤的导模之间的干涉产生的波长相关散斑图案之后，标准多模光纤可以用作通用光谱仪。一个传输矩阵被用来存储校准数据和一个强大的算法被开发来重建一个任意的输入光谱中存在的实验噪声。我们证明，一个20米长的光纤可以解决两个激光线分离只有8 pm。在另一个极端，我们表明，2厘米长的光纤可以测量从超连续谱源产生的宽带连续光谱。我们调查的光纤的几何形状上的光谱分辨率和带宽的影响，并讨论了额外的限制时，测量密集的光谱散斑对比度降低所施加的带宽。最后，我们展示了一种方法，以减少频谱重建误差和增加的带宽分别成像的散斑图案的正交偏振。多模光纤光谱仪是紧凑的，重量轻，成本低，并提供低损耗的高分辨率。(c)2013年美国光学学会
A standard multimode optical fiber can be used as a general purpose spectrometer after calibrating the wavelength dependent speckle patterns produced by interference between the guided modes of the fiber. A transmission matrix was used to store the calibration data and a robust algorithm was developed to reconstruct an arbitrary input spectrum in the presence of experimental noise. We demonstrate that a 20 meter long fiber can resolve two laser lines separated by only 8 pm. At the other extreme, we show that a 2 centimeter long fiber can measure a broadband continuous spectrum generated from a supercontinuum source. We investigate the effect of the fiber geometry on the spectral resolution and bandwidth, and also discuss the additional limitation on the bandwidth imposed by speckle contrast reduction when measuring dense spectra. Finally, we demonstrate a method to reduce the spectrum reconstruction error and increase the bandwidth by separately imaging the speckle patterns of orthogonal polarizations. The multimode fiber spectrometer is compact, lightweight, low cost, and provides high resolution with low loss. (c) 2013 Optical Society of America