1 北京理工大学光电学院，北京 100081
2 福建师范大学光电与信息工程学院，信息光子学研究中心，福建 福州 350117
从体全息存储原理出发，列举了体全息存储的技术和主要的几种系统结构，并就同轴式全息存储系统原理、系统结构、编码方式进行了详细的介绍分析。在未有成熟的相位编码方式的情况下，对基于相位调制的同轴全息存储系统的两种相位编码方式进行了分析评价，这两种相位编码方式对全息存储中相位编码的可能实现方式进行了有效补充，其组合式相位编码方式与传统振幅编码相比提高了编码率且降低了误码率。另外，介绍和分析了一种可以有效减少材料消耗并提高存储密度的多阶复振幅调制的同轴全息存储系统，并对其系统表现性能进行评价。综合评价得出，更合理的编码方式、适当的调制手段和抑制噪声仍是现在全息存储研究中亟待解决的问题。
体全息存储 相位调制 全息编码 相位重建 volume holographic storage phase modulation holographic encoding phase retrieve
Author Affiliations
Abstract
School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
We propose four-level phase pair encoding and decoding with single interferometric phase retrieval for holographic data storage. Inherent with phase pair encoding, phase shifting is generated by assigning a certain phase difference between two pixels of the phase pair. Multiple phase shifting operations are not required. In addition, a phase-readout reference beam can be a plane beam with an arbitrary phase in our method because phase shifting can be encoded on the phase-only spatial light modulator easily and accurately. Therefore, our method can not only increase the data transfer rate, but also improve the robustness of the holographic data storage system. Although the code rate of our method needs to be sacrificed by half, the code rate is still twice that of amplitude code when four-level phase encoding is used. We demonstrated experimentally that there is only a 1×10 2 order of bit error rate before error correcting, which is acceptable. We believe our method will further advance the phase-modulated holographic data storage technique.
210.2860 Holographic and volume memories Chinese Optics Letters
2018, 16(3): 032101
