Media Testing

This work proposes a page differential intensity amplification for optical signal amplification in the intensity multiplexing holographic data storage system. The proposed method detects the signals of four cameras and reconstructs the intensity difference between two pages. The reconstructed intensity difference is amplified by the ratio of the readout beam amplitude to the local oscillator beam amplitude. Experiments showed that the proposed method can achieve a more stable signal amplification than the conventional amplification technique. Moreover, signal detection is possible with half the light intensity of the readout beam compared to the conventional direct detection method. This corresponds to 1.4 times the recording capacity increase if the capacity is limited by M/#, or the reduction to half the readout exposure time.

“…Next, we discuss the quantitative evaluation for the SNR of the amplified signal. The SNR is defined by 28)…”

Section: Methodsmentioning

confidence: 99%

Section: Signal Amplification Based On Pdiamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optical signal amplification between pages for holographic data storage

Yamazaki

Yamaguchi

2022

“…The volume of acceptable information can be increased by changing the incidence angle of the reference beam, enabling several pages of information to be recorded on a single point of the photopolymer. 2,3) To store and retrieve as much data as possible, a number of complex components are required, and it is difficult to align these components accurately enough for perfect recovery of data images. Rotation occurs when there is a misalignment or angular difference between the SLM and complementary metal-oxide-semiconductor image sensor (CMOS).…”

Section: Introductionmentioning

confidence: 99%

Line Tracking Applied Data Acquisition Method for Holographic Data Storage System

Lee

Kim

Lim

et al. 2012

In a holographic data storage device, data are stored and retrieved as two-dimensional images. These images can be distorted in various ways. Generally, sync marks are used to acquire exact pixel values in a distorted image. However, this inevitably results in some loss of data density. In this research, a virtual detector that follows the rows of an image like a compact disk (CD) track is used to acquire the data pixels in a distorted image without sync marks. The proposed method can compensate for image distortion without any loss of data density. The feasibility of the new technique is demonstrated by simulation. The procedure is also evaluated on the basis of signal-to-noise ratio and bit error ratio.

“…where on and off are the mean brightness intensities of the ''on'' and ''off'' dots, respectively, and 2 on and 2 off are their variances. 13) Also, SER was calculated as the probability of x < 0 in the probability distribution (Gaussian) function using…”

mentioning

confidence: 99%

Page Data Multiplexing for Vector Wave Memories Having Polarization Recording Material Doped with Aromatic Ketone Derivative

Ando

Masaki

Shimizu

2013

We have developed a new polarization recording material doped with the photodegradative aromatic ketone derivative AK1-H, modified from our conventional material AK1 for vector wave memories (VWMs) to improve signal stability as well as recording characteristics. 10-multiplex page data recording was performed for the first time in VWMs with AK1-H, exhibiting a signal-to-noise ratio of 3 or higher and an estimated symbol error rate of 10-4 or lower for most pages, respectively. VWM media having AK1-H were also found to show a much higher signal stability than those having the conventional material AK1.