全息光盘存储器的数据存取与像素匹配

全息光盘存储(HDS)技术作为一种非常具有潜力的新型信息存储技术, 是下一代光盘发展的目标。在全息光盘存储系统中, 为了实现数据精确快速地写入和读出, 降低误码率, 需要在整个高分辨率页面上实现空间光调制器(SLM)与光电阵列耦合器(CCD)之间1∶1像素匹配。在体全息存储理论和光学设计理论基础上, 研究实现SLM和CCD像素1∶1匹配的方法, 提出了实现像素匹配的要求和条件, 并且按照此要求完成该全息光盘存储器的光学系统。实验中, 分别使用随机数据掩膜版和SLM实现了对CCD的512×512精确像素匹配, 在光学系统中引入存储介质条件下, 图像质量良好, 掩膜版和SLM原始误码率分别为2.5×10-4和1.5×10-4。

Data and Pixel Match in Holographic Disc Storage

The holographic disc storage (HDS) technology has become one of the potential new types of optical storage technologies. In order to obtain precise input and output information, hence, reduce the bit-error rate in the retrieved data, the accurate pixel matching between the whole high-resolution page of SLM and CCD must be ensured. We discuss the method and technique of pixel matching based on volume holographic storage theory, and then accomplished an optical system to realize pixel match by imaging a random data both mask and SLM of 512×512 pixels. The results showed that 1∶1 pixel matching between spatial light modulator (SLM) and CCD was realized, and a raw bit-error-rate (BER) of 1.5×10-4 (2.5×10-4 of mask) was achieved.