Experimental analysis for recorded data frame of amplitude-modulation coaxial holographic data storage

Yekang Zhan; Yifan Zhang; Qiang Cao; Changsheng Xie

doi:10.1117/12.2603782

24 November 2021 Experimental analysis for recorded data frame of amplitude-modulation coaxial holographic data storage

Yekang Zhan, Yifan Zhang, Qiang Cao, Changsheng Xie

Proceedings Volume 12066, AOPC 2021: Micro-optics and MOEMS; 120660H (2021) https://doi.org/10.1117/12.2603782
Event: Applied Optics and Photonics China 2021, 2021, Beijing, China

Abstract

Optical holographic data storages (HDS) with the high theoretical-capacity density proportional to 1/λ3 have been researched for more than two decades. Among them, the coaxial HDS is current research hotspot. Amplitude-based coding in coaxial holographic storage systems is fundamental and generally employs a 3:16 encoding scheme that sets merely 3 non-adjacent bright pixels within a 4*4 pixels data block with the coding rate of 0.5. This data format is called three-level format (TLF). Unfortunately, the data frame recorded upon the disc is difficult to be recovered accurately in the practice due to the system inherent complexity such as light intensity and distribution, mechanical movement, dynamical focalizing, material distribution, servo subsystem, and component quality. This paper experimentally analyzes inaccurate TLF data frames recognition and its corresponding factors. We design an experimental approach to evaluate the quality of recorded data frames, and we also conclude several observations. First, the luminance among bright pixels within synchronization block consisting of 4×4 bright pixels are unevenly and distorted actually, making the synchronization block locating inaccurately. Second, the distance between two adjacent bright pixels heavily affects the recorded image quality. Third, the high aggregate brightness of a data frame severely reduces the frame’s signal-to-noise ratio. Forth, the recorded image suffers from the picture distortion, but the degree of distortion is slight within an acceptable range. Last, holographic material distribution upon disc also affects the brightness and pixel consistency. Based on these observations, we discuss several solutions to improve the reading accuracy for hologram data frames.

Citation Download Citation

Yekang Zhan, Yifan Zhang, Qiang Cao, and Changsheng Xie "Experimental analysis for recorded data frame of amplitude-modulation coaxial holographic data storage", Proc. SPIE 12066, AOPC 2021: Micro-optics and MOEMS, 120660H (24 November 2021); https://doi.org/10.1117/12.2603782

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KEYWORDS

Data storage

Holography

Holograms

Image quality

Distortion

Data conversion

Data processing

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