Line Tracking Applied Data Acquisition Method for Holographic Data Storage System

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 rese...

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Bibliographic Details
Published inJapanese Journal of Applied Physics Vol. 51; no. 8; pp. 08JD07 - 08JD07-6
Main Authors Lee, Jae-Seong, Kim, Nakyeong, Lim, Sung-Yong, Kim, Jang Hyun, Park, Kyoung-Su, Park, No-Cheol, Yang, Hyunseok, Park, Young-Pil
Format Journal Article
LanguageEnglish
Published The Japan Society of Applied Physics 01.08.2012
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Summary: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.
Bibliography:Sync mark usage: (a) data image with sync mark, (b) example of sync mark --- the specific pattern of a few pixels, and (c) displacement of sync mark. Concept of data acquisition method for HDS using tracking method: (a) track of conventional ODD and (b) each row of data image is considered as one track of conventional ODD. The distortion of data image can be considered as detrack of ODD. Examples of various frequencies (period/100 pixels). Overall algorithm. Shape of virtual detector. Optical system for simulation. Feedback block diagram. Small part of simulation results. SNR graph with respect to the variation in angle. Raw BER graph with respect to the variation in angle.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.51.08JD07