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Frontiers of Optoelectronics

ISSN 2095-2759

ISSN 2095-2767(Online)

CN 10-1029/TN

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Front. Optoelectron.    2014, Vol. 7 Issue (4) : 467-474    https://doi.org/10.1007/s12200-014-0477-4
RESEARCH ARTICLE
Optimized multi-dimensional optical storage reading strategy
Hequn WANG1,Jing PEI2,*(),Longfa PAN2
1. Division of Nanometrology and Measurement for Advanced Materials, National Institute of Metrology, Beijing100029, China
2. Optical Memory National Engineering Research Center, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
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Abstract

A novel multi-dimensional (MD) optical storage was presented, which was realized by utilizing the space between tracks. Based on scalar diffraction theory, the channel bits parameters of the multi-dimensional optical storage were optimized, and the linear and nonlinear signals were analyzed accurately. Therefore, the format of the multi-dimensional optical disc was obtained, which makes the detection of readout signal easier. With respect to servo, coding and readout physics parameter of channel, the multi-dimensional optical disc is compatible with traditional disc such as Blu-ray disc (BD). Also, the novel multi-dimensional optical storage is able to achieve a doubled density and a ten-fold readout data rate compared with traditional optical discs.
Keywords multi-dimensional (MD)      optical storage      scalar diffraction model      partial response     
Corresponding Author(s): Jing PEI   
Just Accepted Date: 03 November 2014   Online First Date: 03 December 2014    Issue Date: 12 December 2014
 Cite this article:   
Hequn WANG,Jing PEI,Longfa PAN. Optimized multi-dimensional optical storage reading strategy[J]. Front. Optoelectron., 2014, 7(4): 467-474.
 URL:  
https://academic.hep.com.cn/foe/EN/10.1007/s12200-014-0477-4
https://academic.hep.com.cn/foe/EN/Y2014/V7/I4/467
Fig.1  Schematic format of multi-dimensional (MD) optical storage. (a) Schematic format for the first format of the MD optical storage; (b) schematic format for the second format of the MD optical storage
Fig.2  Channel bit of the sub-track is 0.5 channel bit behind the channel bit of the track
Fig.3  Channel bits parameter of the track and sub-track
Fig.4  Coefficients cj of the track, when chl = 80/90/100 nm, for BD pick-up unit (λ=405 nm, NA=0.85)
Fig.5  Coefficients cj of the sub-track (sub-T), when chw = 110/120/130 nm, for BD pick-up unit (λ =405 nm, NA=0.85)
Fig.6  All possibilities of the partial response (PR) channel bits of the sub-track, when the PR channel bits of the track is “0 0 0 0”
Fig.7  Signal patterns for the partial response (PR) channel bits. (a) Signal patterns for the PR channel bits, when pw = 80 nm. L(1,10) represent 10 signal pattern curves, and all 8 signal patterns in every signal pattern curve are obtained by the same PR channel bits of the track and different PR channel bits of the sub-track. The PR channel bits of the track in every signal pattern curve are shown. Correspond?with?all point of L6, all possibilities of the PR channel bits of the sub-track are shown. The several signal patterns in the dotted frame are merged into one point because of their similarity; (b) and (c) signal patterns for the PR channel bits, when pw = 40 and 130 nm
channel bitwidth/nm channel bit length/nm pit area width/nm sub-track round diameter/nm
130 90 80 80
Tab.1  Channel bits parameter
position j=1.5 j=1.0 j=0.5 j=0 j=-0.5 j=-1.0 j=-1.5
sub-track 3 4 3
track 5 9 9 5
sub-track 3 4 3
Tab.2  Coefficients of partial response (PR)
Fig.8  Nonlinear coefficient. (a) Nonlinear coefficient among the channel bits of the track; (b) nonlinear coefficient among the channel bits of the sub-track; (c) nonlinear coefficient among the channel bits of the sub-track and track
Fig.9  Simulated signal waveform according to the model of a BD pick-up unit (λ=405 nm, NA=0.85). Channel bit length, chl = 90 nm; channel bit width, chw = 130 nm. The channel bit sequence of the track is -8T-4T-4T-2T-2T-8T-, and the channel bit sequence of the sub-track is comprised only by 2T. The full signal waveform, the linear approximation (with constant term 1 and the linear contributions with cj), and the nonlinear (NL) contributions related to ej,k
Fig.10  Comparison of bER performances for different chl
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[1] Shenggang WAN,Qiang CAO,Changsheng XIE. Optical storage: an emerging option in long-term digital preservation[J]. Front. Optoelectron., 2014, 7(4): 486-492.
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