论文部分内容阅读
1.引言为了提高光存储系统的容量和数据传输率,在现有光盘系统的基础上,人们提出并研究了多种解决方案,其中为人所熟知的就是减小激光的波长和增大物镜的数值孔径。另外一种也很有发展前景的方案就是采用多阶技术。与传统光存储系统中采用的二阶编码技术相比,多阶技术可以显著地提高存储线密度;同时可并行地提高读写速度。目前存在着多种多阶技术,包括Sony公司的SCIPER(Single CarrierIndependent Pit Edge Recording)技术和GBR(Groove BasebandRecording)技术、Philips公司的LML(Limited Multi-Level)技术、Sharp公司的PEDM(Pit Edge and Depth
1. INTRODUCTION In order to improve the capacity and data transmission rate of optical storage systems, many solutions have been proposed and studied on the basis of existing optical disk systems. Among them, it is well known to reduce the wavelength of laser light and enlarge the objective lens Numerical aperture. Another promising solution is multi-stage technology. Compared with the second-order encoding technology adopted in the traditional optical storage system, multi-stage technology can significantly improve the storage line density; at the same time, the speed of reading and writing can be improved in parallel. Currently, there are many multi-stage technologies, including Single Carrier Independent Pit Edge Recording (SCIPER) by Sony Corporation, Groove Baseband Recording (GBR), Limited Multi-Level (LML) by Philips, and PEDM Depth