Multimode Optical Fiber Surface Plasmon Resonance Signal Processing Based on the Fourier Series Fitting |
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| Authors: | Peng Zhou Wenbin Zhang Junxing Wang Jin Liu Rongxin Su Wang Xuemin |
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| Institution: | 1.School of Precision Instrument and Opto-electronics Engineering,Tianjin University,Tianjin,China;2.Tianjin Key Laboratory of Biomedical Detecting Techniques and Instruments,Tianjin University,Tianjin,China;3.State Key Laboratory of Chemical Engineering, Tianjin Key Laboratory of Membrane Science and Desalination Technology, School of Chemical Engineering and Technology,Tianjin University,Tianjin,China |
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| Abstract: | Multimode optical fiber is widely used because of its large core size, strong light-gathering ability, and remote on-line sensing ability in various environments. Due to the mode coupling and polarization loss, the signal curve obtained has wide full width at half-maximum (FWHM) and small peak value. Therefore, efficient methods to calculate the resonant wavelength are required. This paper presents a method to process the surface plasmon resonance curve (SPR) based on the Fourier series fitting. The calculated resonant wavelength is obtained with one-dimensional extremum-search method. Experiment results show the proposed method can accurately calculate the resonant wavelength of high concentration solution. Additionally, the method has higher sensitivity and is unaffected by the light source fluctuation. This method has potential value in processing the SPR signal of the multimode optical fiber. |
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