双光束干涉仪的相位调制解调通常会用到椭圆拟合的方法来计算相应的解调参数,提出了一种用于评价这类参数的计算精度的方法。根据自适应的蒙特卡罗法,计算不同噪声水平下椭圆拟合估算的参数的最大偏差;根据实验测得的干涉信号噪声本底...双光束干涉仪的相位调制解调通常会用到椭圆拟合的方法来计算相应的解调参数,提出了一种用于评价这类参数的计算精度的方法。根据自适应的蒙特卡罗法,计算不同噪声水平下椭圆拟合估算的参数的最大偏差;根据实验测得的干涉信号噪声本底的大小,判断拟合的参数的精度。以基于3×3耦合器的光纤水听器的两路输出方案为例,该方案为提高水听器的解调性能,需研究参数的数值随器件性能的变化规律,因此首先要判定实验中通过椭圆拟合所求得的参数的准确性。将该精度评定方法运用在水听器测量实验中,测量的干涉信号在20 Hz^4 k Hz处的噪声本底接近-70 d B·V2/Hz,根据自适应的蒙特卡罗法,得到参数的偏差不超过0.06%和0.08°。展开更多
Utilizing the Young’s double slits and Mach-Zehnder interferometer, we proposed an experimental method to measure the generalized Stokes parameters of a radially polarized random electromagnetic beam. After the parti...Utilizing the Young’s double slits and Mach-Zehnder interferometer, we proposed an experimental method to measure the generalized Stokes parameters of a radially polarized random electromagnetic beam. After the partially coherent beam propagating through the Young’s double slits, the interference fringe is obtained by the help of a Mach-Zehnder interferometer consisting of apertures, quarter-wave plates and polarizers. The electric cross-spectral density matrix is detected by the coherence degree of interference fringe and the density of each single slit. The generalized Stokes parameters can be obtained from the electric cross-spectral density matrix. This experiment measures the generalized Stokes parameters of the random electromagnetic beam successfully. The results show that the spectral degree of coherence for copolarized cases (xx and yy) is similar with that for cross-polaried cases (xy and yx) for the radially polarized random electromagnetic beam. This method will help us determine the change of the polarization and coherence of the light in propagation by detecting the change of the generalized Stokes parameters.展开更多
文摘双光束干涉仪的相位调制解调通常会用到椭圆拟合的方法来计算相应的解调参数,提出了一种用于评价这类参数的计算精度的方法。根据自适应的蒙特卡罗法,计算不同噪声水平下椭圆拟合估算的参数的最大偏差;根据实验测得的干涉信号噪声本底的大小,判断拟合的参数的精度。以基于3×3耦合器的光纤水听器的两路输出方案为例,该方案为提高水听器的解调性能,需研究参数的数值随器件性能的变化规律,因此首先要判定实验中通过椭圆拟合所求得的参数的准确性。将该精度评定方法运用在水听器测量实验中,测量的干涉信号在20 Hz^4 k Hz处的噪声本底接近-70 d B·V2/Hz,根据自适应的蒙特卡罗法,得到参数的偏差不超过0.06%和0.08°。
文摘Utilizing the Young’s double slits and Mach-Zehnder interferometer, we proposed an experimental method to measure the generalized Stokes parameters of a radially polarized random electromagnetic beam. After the partially coherent beam propagating through the Young’s double slits, the interference fringe is obtained by the help of a Mach-Zehnder interferometer consisting of apertures, quarter-wave plates and polarizers. The electric cross-spectral density matrix is detected by the coherence degree of interference fringe and the density of each single slit. The generalized Stokes parameters can be obtained from the electric cross-spectral density matrix. This experiment measures the generalized Stokes parameters of the random electromagnetic beam successfully. The results show that the spectral degree of coherence for copolarized cases (xx and yy) is similar with that for cross-polaried cases (xy and yx) for the radially polarized random electromagnetic beam. This method will help us determine the change of the polarization and coherence of the light in propagation by detecting the change of the generalized Stokes parameters.
