Multi-level read-only recording using signal waveform modulation

Tang, Yi; Pei, Jing; Ni, Yi; Pan, Longfa; Hu, Hua; Zhang, Buqing

doi:10.1364/oe.16.006156

Cited by 22 publications

(13 citation statements)

References 10 publications

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“…The code rate of proposed scheme is slightly smaller than that of RSPC that means we use the code rate of ECC to improve the correctable capability. In our signal waveform modulation (SWM) ML DVD system [5] the modulation code is bi-modulation code with code rate of 7/8 that means the constraints are imposed both on runlength and level of signals and the run-lengths of signals can be converted to the varying of levels of signal waveforms. The smallest pit in the SWM ML DVD is 2T with the length of 335nm and the T is an interval of a channel bit.…”

Section: Simunlation Resultsmentioning

confidence: 99%

New interleaving scheme for error correction code of a multilevel optical storage system

Liu

Pan

et al. 2008

Eighth International Symposium on Optical Storage and 2008 International Workshop on Information Data Storage

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Disc scratches, dusts and noise corruption et al. will cause data sequence errors including random errors and burst errors. With the recording density of multilevel (ML) optical storage system increasing, the same length of scratches on the surface of optical disc will bring more burst errors in ML DVD than conventional optical recording systems, e.g., digital versatile disc (DVD) and compact disc (CD). A new interleaving scheme based on Reed-Solomon code (RS) is proposed to solve this problem. In DVD system, the burden of the Parity of Outer-code (PO) is huge, while the Parity of Innercode (PI) has more correcting ability than needed. The new interleaving algorithm adjusts the structure of data frame and block and improves the interleaving depth of ECC block to reduce the burden of PO. The results of numerical simulations are presented to verify the performance of the new interleaving algorithm compared with RSPC. The new proposed scheme can correct maximum burst error length of the proposed code is 6912 bytes. Burst error correcting capacity of the proposed scheme is improved up to137.4% more than that of the RSPC.

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Section: Simunlation Resultsmentioning

confidence: 99%

New interleaving scheme for error correction code of a multilevel optical storage system

Liu

Pan

et al. 2008

Eighth International Symposium on Optical Storage and 2008 International Workshop on Information Data Storage

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“…Then after signal reconstruction of 2T, we can see the run length resolution ability of multi-level signal (shown in figure 4) is much higher than the case shown in figure 2, and we can easily separate the signal with different run length. In latest multi-level read-only recording system, a signal waveform modulation (SWM) ML recording in which a subland/pit is inserted to the original pit/land, leading to variations in waveform of readout signal is realized by using the waveform to differentiate the levels, and is implemented on the DVD platform [8] . While DK (1,9) modulation is used and the minimum pit length is 320nm, write strategy optimization work will be difficult and complex for the special case that four shortest pits stay next to each other surrounded by two longest pits, as the signal waveform of long length pit with high level is similar to this special case.…”

Section: Restriction Caused By Read-out Channelmentioning

confidence: 99%

“…Nowadays, OMNERC research group is going to advance the capacity to 15GB by reducing the 3T pit length and increasing the level of long pit based on the signal waveform modulation (SWM) ML recording technology which is more suitable in red laser multilevel than signal amplitude modulation (SAM) recording technology [2] .…”

Section: Introductionmentioning

confidence: 99%

Restrictions on pit length in multi-level read-only disk

Yang

Tang

et al. 2008

Eighth International Symposium on Optical Storage and 2008 International Workshop on Information Data Storage

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Nowadays, OMNERC research group is going to advance the capacity to 15GB by reducing the 3T pit length and increasing the level of long pit based on the signal waveform modulation (SWM) ML recording technology. In order to prove this method is realizable, this paper proposes the restriction points of consideration to reduce the minimum pit length which influence the basic specification design of multi-level disk and the difficulty of the following signal processing. Firstly the restriction of optical pick-up resolution is considered. Secondly, the restriction caused by read-out channel is discussed in the paper. At the same time as write strategy has its limit based on the previous research, this paper finally discuss the influence caused by minimize shortest pit length for level design of long length pit.

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“…Multilevel encoding has been demonstrated for instance in polymers but it appears that these systems are subject to significant bleaching with limited number of levels and linearity [6,7]. Multilevel encoding has also previously been demonstrated in optical discs for up to 2 bits per point storage [8,9] and in photoisomeric birefringent polymers using high power femtosecond lasers for the write step [10,11].…”

Section: Introductionmentioning

confidence: 99%

Towards rewritable multilevel optical data storage in single nanocrystals

et al. 2018

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Novel approaches for digital data storage are imperative, as storage capacities are drastically being outpaced by the exponential growth in data generation. Optical data storage represents the most promising alternative to traditional magnetic and solid-state data storage. In this paper, a novel and energy efficient approach to optical data storage using rare-earth ion doped inorganic insulators is demonstrated. In particular, the nanocrystalline alkaline earth halide BaFCl:Sm is shown to provide great potential for multilevel optical data storage. Proof-of-concept demonstrations reveal for the first time that these phosphors could be used for rewritable, multilevel optical data storage on the physical dimensions of a single nanocrystal. Multilevel information storage is based on the very efficient and reversible conversion of Sm to Sm ions upon exposure to UV-C light. The stored information is then read-out using confocal optics by employing the photoluminescence of the Sm ions in the nanocrystals, with the signal strength depending on the UV-C fluence used during the write step. The latter serves as the mechanism for multilevel data storage in the individual nanocrystals, as demonstrated in this paper. This data storage platform has the potential to be extended to 2D and 3D memory for storage densities that could potentially approach petabyte/cm levels.

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Multi-level read-only recording using signal waveform modulation

Cited by 22 publications

References 10 publications

New interleaving scheme for error correction code of a multilevel optical storage system

New interleaving scheme for error correction code of a multilevel optical storage system

Restrictions on pit length in multi-level read-only disk

Towards rewritable multilevel optical data storage in single nanocrystals

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