Holographic storage using phase-code and rotation multiplexing

James Zhiqing Wen; Nan Li; Yu Xu; Xiangyang Yang

doi:10.1117/12.255469

25 October 1996 Holographic storage using phase-code and rotation multiplexing

James Zhiqing Wen, Nan Li, Yu Xu, Xiangyang Yang

Proceedings Volume 2849, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications II; (1996) https://doi.org/10.1117/12.255469
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

Multiple holograms can be storage in a volume holographic medium such as photorefractive crystal or photopolymers by using phase-code multiplexing. However, due to the limited performance of currently available spatial phase encoders, only a small number of orthogonal phase codes can be implemented. This significantly limits the capacity of holographic systems based on phase-code multiplexing scheme. In this paper, a new multiplexing method, rotation multiplexing, is presented. After a number of holograms are stored by phase-code multiplexing, the holographic medium is rotated in the incident plane by a small angle. New holograms can then be stored by the same phase-codes without cross talk. By combining the phase-code and rotation multiplexing schemes, a high capacity 3D storage system can be built with off-the-shelf devices. An additional advantage of such a holographic storage system is its burst retrieval mode that is useful for network applications. The preliminary experimental results demonstrate the feasibility of the proposed approach.

Citation Download Citation

James Zhiqing Wen, Nan Li, Yu Xu, and Xiangyang Yang "Holographic storage using phase-code and rotation multiplexing", Proc. SPIE 2849, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications II, (25 October 1996); https://doi.org/10.1117/12.255469

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