&lt;title&gt;Comparative evaluation of the volume holographic memory information capacity limits caused by different limitation factors&lt;/title&gt;

Gurevich, Boris; Gurevich, S. A.; Zhumaliev, Kubanychbek M.; Alymkulov, Salmor A.; Sagymbaev, Samat A.; Akkoziev, Imil A.

doi:10.1117/12.404777

Cited by 1 publication

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“…The pixel pitch of SLM is 20 μm and we use 2 × 2 pixels to denote 1 phase data. We set 50 × 50 fourlevel phase data in the signal part and a similar amount of (6) four-level phase data in the reference part of the data page. The pixel pitch of CMOS is 5.86 μm, and we captured twice the Nyquist size of the Fourier intensity of the input.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

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Non-interferometric phase retrieval for collinear phase-modulated holographic data storage

Hao

Ren

Zhang

et al. 2020

Opt Rev

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Because of its simple optical system setup and robust noise tolerance, non-interferometric phase retrieval is an important technique for phase-modulated holographic data storage. Usually, the iterative algorithm of non-interferometry needs hundreds of iteration numbers to retrieve phase accurately, the data transfer rate decreases severely. Strong constraints such as adding embedded data into the phase data page can reduce the iteration numbers, but this method decreases the code rate severely. In this paper, we proposed the advanced non-interferometric phase retrieval method based on the collinear system. By encoding the reference beam of the collinear optical holographic storage system with embedded data, the storage space of the signal beam data page is completely released and the encoding rate is doubled. The embedded data can provide more modulation index including phase and amplitude to shorten iterations, so the data transfer rate is also increased. In the simulation, we recorded a four-level phase pattern and retrieved the phase correctly.

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Section: Simulation Results and Discussionmentioning

confidence: 99%

“…Optical holographic storage can encode and store data information in two ways: amplitude modulation and phase modulation. Because of its signal-to-noise ratio and encoding rate are relatively low, the amplitude-modulated holography storage technology has been unable to meet the current explosive data storage requirements gradually [5,6].…”

Section: Introductionmentioning

confidence: 99%