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首页> 外文期刊>Applied optics >Measurement of phase and group refractive indices and dispersion of thermo-optic and strain-optic coeffients of optical fibers using weak fiber Bragg gratings
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Measurement of phase and group refractive indices and dispersion of thermo-optic and strain-optic coeffients of optical fibers using weak fiber Bragg gratings

机译：弱纤维布拉格光栅测量光纤热光纤和应变光学系数的相位折射率和分散

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摘要

In this work we report on the measurement, with record accuracy, of the absolute modal effective refraction index (phase index) of single-mode optical fibers by using Bragg gratings. We also demonstrate a new method to measure the group index of the fibers from the grating's Bragg wavelength. We present as well the characterization of the thermo-optic and strain-optic coefficients as a function of the wavelength; the values we have obtained are the closest to those of pristine fiber measured with gratings technology so far. The phase index is measured with a set of gratings in the wavelength ranges from 1509 to 1563 nm, and the group index is obtained from the wavelength dependence of the phase index. Very weak gratings with reflectivity down to 10(-3) have been used in order to minimize the perturbation of the pristine fiber. Results are presented at a temperature of 22 degrees C and zero strain after preliminary calibration of the thermo-optic and strain-optic coefficients as a function of the wavelength. Accuracies better than 3 x 10(-5) and 7 x 10(-4) have been achieved for the phase and group indices, respectively. It is also shown that the main source of error relates to the uncertainty in pitch of the phase masks used for grating inscription. The technique is useful for testing different kinds of fibers including telecommunication, amplifying, and polarization maintaining. (C) 2021 Optical Society of America
机译：在这项工作中，我们报告了使用布拉格光栅测量单模光纤绝对模式有效折射率（相位指数）的记录精度。我们还展示了一种从光栅的布拉格波长测量光纤群折射率的新方法。我们还描述了热光系数和应变光学系数随波长变化的特性；到目前为止，我们得到的数值与用光栅技术测量的原始光纤最接近。用一组波长范围为1509至1563nm的光栅测量相位指数，并根据相位指数的波长依赖性获得群指数。为了减小原始光纤的扰动，使用了反射率低至10（-3）的非常弱的光栅。在初步校准作为波长函数的热光系数和应变光学系数后，在22℃温度和零应变下给出了结果。相位和群指数的精度分别优于3x10（-5）和7x10（-4）。还表明，误差的主要来源与用于光栅刻字的相位掩模的间距不确定性有关。该技术可用于测试各种光纤，包括电信、放大和偏振保持。（2021）美国光学学会

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  • 来源
    《Applied optics》 |2021年第10期|共9页
  • 作者

    Cruz J. L.; Barmenkov Y. O.; Diez A.; Andres M. V;

  • 作者单位

    Univ Valencia Dept Appl Phys ICMUV Dr Moliner 50 Burjassot 46100 Spain;

    Ctr Invest Opt AC Leon 37150 Spain;

    Univ Valencia Dept Appl Phys ICMUV Dr Moliner 50 Burjassot 46100 Spain;

    Univ Valencia Dept Appl Phys ICMUV Dr Moliner 50 Burjassot 46100 Spain;

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