光瞳环带相位调制法提高数字光存储密度的研究

对高密度光存储技术中光瞳环带相位调制方法进行了分析，并将其与光学切趾术进行了比较．研究发现，这种减小像面上光斑大小的方法是以大幅度增加旁瓣与主瓣的相对大小为代价的，它提高光存储密度的效果基本与光学切趾术相当．但是，对于高阈值的光探测器．光瞳相位调制方法要优于光学切趾术．

Research on pupil zonal phase modulation method for improving the data optical storage density

The pupil zonal phase modulation method used in high-density optical storage is analysede and compared with the optics apodization method. Researches show that in the method, decreasing the size of the light spot is at the cost of increasing remarkably the relative size of the main spot versus the side spot. Its effect is comparable to that of using optics apodization method. However, for the light detector with high threshold, the pupil zonal phase modulation method is better than the optics apodization method.