Transmission Type of Collinear Volume Holographic Storage Technology Based on LiNbO<sub>3</sub>Crystal

Jianhua, 李建华 Li; Liangcai, 曹良才 Cao; Xiaodi, 谭小地 Tan; Qingsheng, 何庆声 He; Guofan, 金国藩 Jin

doi:10.3788/aos201232.0409001

Cited by 4 publications

(2 citation statements)

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“…Different orthogonal phase keys record holograms in holographic storage materials. When a wrong phase key is used in the reconstruction, the crosstalk leads to signal leakage [27][28][29]. Such crosstalk significantly reduces the quality of HDS.…”

Section: Introductionmentioning

confidence: 99%

Reducing the Crosstalk in Collinear Holographic Data Storage Systems Based on Random Position Orthogonal Phase-Coding Reference

Song,

Li,

Lin

et al. 2023

Photonics

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Previous studies have shown that orthogonal phase-coding multiplexing performs well with low crosstalk in conventional off-axis systems. However, noticeable crosstalk occurs when applying the orthogonal phase-coding multiplexing to collinear holographic data storage systems. This paper demonstrates the crosstalk generation mechanism, features, and elimination methods. The crosstalk is caused by an inconsistency in the intensity reconstruction from the orthogonal phase-coded reference wave. The intensity fluctuation range was approximately 40%. Moreover, the more concentrated the distribution of pixels with the same phase key, the more pronounced the crosstalk. We propose an effective random orthogonal phase-coding reference wave method to reduce the crosstalk. The orthogonal phase-coded reference wave is randomly distributed over the entire reference wave. These disordered orthogonal phase-coded reference waves achieve consistent reconstruction intensities exhibiting the desired low-crosstalk storage effect. The average correlation coefficient between pages decreased by 73%, and the similarity decreased by 85%. This orthogonal phase-coding multiplexing method can be applied to encrypted holographic data storage. The low-crosstalk nature of this technique will make the encryption system more secure.

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Section: Introductionmentioning

confidence: 99%

Reducing the Crosstalk in Collinear Holographic Data Storage Systems Based on Random Position Orthogonal Phase-Coding Reference

Song,

Li,

Lin

et al. 2023

Photonics

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“…After reconstruction verification and experimental verification, we choose the eigenvector corresponding to the first 16 largest eigenvalues and visualize it as the face library. On the face, gray scale equalization and coding can improve the identification of optical correlation recognition [3] .…”

Section: Principle Of Coherent Light Processing Algorithmmentioning

confidence: 99%

Research on Face Recognition of Large Capacity Coherent Photoelectric Hybrid

Zhou¹,

Li²

2017

Proceedings of the 2017 5th International Conference on Frontiers of Manufacturing Science and Measuring Technology (FMSMT 2017

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Abstract:With the increase of the face database, the electronic computing is exponentially increasing, and the traditional face recognition method can't meet the requirement of real-time recognition. Optical actuator have parallel processing, fast features, and thus in the face recognition side and presents a huge potential. The application of photoelectric hybrid processing system in face recognition should not only follow the common law of ordinary photoelectric hybrid processing system, but also play the advantages of light calculation. The application of photoelectric hybrid processing system in human visual target recognition is to follow the common law of ordinary photoelectric hybrid processing system, but also take into account the special needs of human visual application, so its feasibility study status, research level, photoelectric hybrid processing A large number of studies selected to improve the innovation suitable for robot vision recognition hardware structure and software algorithms and other issues to explore the issue. Theoretical Introduction of Coherent LightCoherent light refers to all the parameters that can be predicted and correlated at any point in time or space, especially in a region on a plane perpendicular to the propagation direction, or at a particular point in space. The working principle of the system is more close to that of conventional radio communication systems than conventional optical fiber communication systems. In the coherent optical fiber communication system, the digital signal adopts amplitude modulation keying (ASK), frequency shift keying (FSK) and phase shift keying (PSK). In other word, the scene must be processed with a further digital algorithm to reconstruct the 3-D image in the computer's memory.High sensitivity: coherent demodulation of the signal amplitude and the local oscillator amplitude is proportional to. Since the power of the local oscillator source is much greater than the signal power, the resulting signal amplitude will be much larger than the direct detection. The photo detection quantum noise is also scaled up, and the received signal-to-noise ratio is greatly improved due to the constant thermal noise amplitude of the photo detector and the receiver, which in turn improves the reception sensitivity. In addition, the use of frequency shift keying or phase shift keying of these excellent modulation can also make the sensitivity to further improve [1] . Generally, the reception sensitivity of the coherent receiving system can be 10 ~ 20dB higher than that of the conventional optical fiber communication system. The selectivity is good: the conventional optical fiber communication system is multiplexed and must be optically filtered. Similar to the radio communication system, the local oscillator and the signal light are subjected to an intermediate frequency in the coherent optical communication system, and an electrical filter can be used at the intermediate frequency. Since the electrical filter is much more selective than the optical filter, t...

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Linear polarization holography

Wang¹,

Tan²,

Qi³

et al. 2022

OES

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Polarization holography is a newly researched field, that has gained traction with the development of tensor theory. It primarily focuses on the interaction between polarization waves and photosensitive materials. The extraordinary capabilities in modulating the amplitude, phase, and polarization of light have resulted in several new applications, such as holographic storage technology, multichannel polarization multiplexing, vector beams, and optical functional devices. In this paper, fundamental research on polarization holography with linear polarized wave, a component of the theory of polarization holography, has been reviewed. Primarily, the effect of various polarization changes on the linear and nonlinear polarization characteristics of reconstructed wave under continuous exposure and during holographic recording and reconstruction have been focused upon. The polarization modulation realized using these polarization characteristics exhibits unusual functionalities, rendering polarization holography as an attractive research topic in many fields of applications. This paper aims to provide readers with new insights and broaden the application of polarization holography in more scientific and technological research fields.

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Transmission Type of Collinear Volume Holographic Storage Technology Based on LiNbO₃Crystal

Cited by 4 publications

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Reducing the Crosstalk in Collinear Holographic Data Storage Systems Based on Random Position Orthogonal Phase-Coding Reference

Reducing the Crosstalk in Collinear Holographic Data Storage Systems Based on Random Position Orthogonal Phase-Coding Reference

Research on Face Recognition of Large Capacity Coherent Photoelectric Hybrid

Linear polarization holography

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Transmission Type of Collinear Volume Holographic Storage Technology Based on LiNbO3Crystal

Cited by 4 publications

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Reducing the Crosstalk in Collinear Holographic Data Storage Systems Based on Random Position Orthogonal Phase-Coding Reference

Reducing the Crosstalk in Collinear Holographic Data Storage Systems Based on Random Position Orthogonal Phase-Coding Reference

Research on Face Recognition of Large Capacity Coherent Photoelectric Hybrid

Linear polarization holography

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Transmission Type of Collinear Volume Holographic Storage Technology Based on LiNbO₃Crystal