Using advanced signal processing and modulation coding techniques, multilevel optical storage can further increase the disc capacity and data transfer rate without changing the optical pick-up head and mechanical system of the disc drives. 多阶光存储是一种在不改变原有光路和机械系统的情况下,利用先进的信号处理与调制编码技术,显著提高存储容量和数据传输率的新型技术。