A Gray Level Weighting Method to Reduce Optical Aberration Effect in Holographic Data Storage System

作者：Ou Yang Mang; Chen Yu Ta^*

来源：IEEE Transactions on Magnetics, 2011, 47(3): 546-550.

DOI：10.1109/TMAG.2010.2096462

• Alignment method
• fiducial point
• gravity center
• holographic data storage

An alignment method for holographic data storage system (HDSS) is proposed in this paper. Due to several types of noises encountered in the HDSS, the signal-to-noise ratio (SNR) is degraded. Errors can be corrected using a channel code for some sorts of noise, while it may require a high quality optical system to reduce the error probability for the other types of noise. A checkerboard pattern is proposed using intensity weighting to find the fiducial points, which could work in a lower SNR system and thus reduce the error likelihood effectively. Reed-solomon (RS) code and oversampling are both made available in the HDSS. As a consequence, the aberration effects are eliminated using the fiducial points, leading to a low SNR system clear of errors after performing decoding. The lowest SNR system is out of error-free recovery condition, so that all the alignment methods proposed in this paper could not reduce the aberration effects to restore the images into the original data.

• 出版日期2011-3
• 单位中央民族大学