Line Tracking Applied Data Acquisition Method for Holographic Data Storage System

Abstract

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.

Improvement of Bit Error Rate in Holographic Data Storage Using the Extended High-Frequency Enhancement Filter

“…[11][12][13][14] In addition, the compensation for mechanical problems was studied, including the compensation of two-dimensional misalignment, 15,16) the oversampling method to recover the mechanical misalignment, 17,18) the reduction method of interpixel interference, [19][20][21] and the tracking method using sync marks. 22,23) However, these studies are based on the signal processing methods, i.e., modulation code and channel code, or mechanical control with a servo system, and these studies are based on the adaptation of conventional ODD technologies to HDS.…”