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Research on Chromatic Dispersion Measurement of Fiber Based on Mickelson White-light Interferometry

Author: ZhangXueMin
Tutor: JiaDaGong
School: Tianjin University
Course: Optical Engineering
Keywords: Chromatic dispersion measurement Photonic crystal fiber White-light interferometry Nonlinear curve fitting Phase difference value method
CLC: O436.3
Type: Master's thesis
Year: 2009
Downloads: 74
Quote: 1
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Abstract


Photonic crystal fiber as a typical specialty optical fiber has a wide range of applications the dispersion (Chromatic dispersion, CD) as it is one of the important parameters directly affect the photonic crystal fiber and its production performance of the device. Due to the research needs of the photonic crystal fiber structural diversity and related devices, CD precision measurement of photonic crystal fiber is particularly important. By Michelson white light interference method on the basis of analysis of the ordinary optical fiber the CD measurement method developed a set of experimental system can be used to measure the chromatic dispersion of photonic crystal fiber, the entire measurement range of the system CD up -1000ps/nm, and studied four kinds extraction algorithm based on white light Michelson interferometry CD. Build a complete experimental system to test the value of photonic crystal fiber CD. Experimental results show that: the average measurement accuracy up to 3.39 ps / (nm · km), repeatability of measurement error is less than 0.71ps / (nm · km). Tested photonic crystal fiber at 1550nm, the CD value 8.05341ps / (nm · km). This thesis completed several jobs from white interference theory, the chromatic dispersion measurement system model based on Michelson white light interferometry, expounded the basic principle of white light interferometry measuring chromatic dispersion, given the system interference light strong expression; simulation chromatic dispersion test system interference spectra obtained using Matlab software characteristics of the interference spectrum. 2. Completion of the center wavelength, the turning point in the analysis, nonlinear curve fitting and the phase difference value method for the the interference spectral data analysis and processing algorithms; compare the advantages and disadvantages of each method, combined with the actual situation of the system selects the non-linear resistance curve fitting, and the phase difference value method for data processing, and the completion of the algorithm. Design and to structures completed a set of optical fiber chromatic dispersion measurement system based on Michelson white light interferometry. Designed according to the system requirements of the structure type of the measuring arm of the interferometer, the spatial light coupled into the optical fiber under test through the microscope objective, the test arm beam reflector and the fiber mirror. Visibility of the interference spectrum, proposed a light intensity balance method for an effective solution to the arms interference light intensity imbalance. 4 respectively, by an ordinary single-mode fiber, dispersion-shifted fiber and a photonic crystal fiber as the optical fiber under test, conducted experiments and analysis for the chromatic dispersion measurement system has been completed structures, basically consistent with the experimental results obtained with the theoretical curve.

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CLC: > Mathematical sciences and chemical > Physics > Optics > Physical optics ( wave optics ) > Polarization and dispersion
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