Objective
We propose to develop a new and challenging concept for optical storage, in which the information written on the disc fundamentally has a TWO-DIMENSIONAL CHARACTER. We call this new concept "TwoDOS" (Two-Dimensional Optical Storage). The aim is to generate the key-technologies that realize an increase with a factor of two in DATA DENSITY and a factor of 10 in DATA RATE for an optical read-only system, based on innovative 2D channel modulation and advanced signal processing, in combination with a read-channel using a parallel readout via a multi-spot light path. We will show the proof-of-concept on a read-only disc using binary modulation: this will lead to a capacity of 50 GB for a 12 cm disc, and a 300 Mb/s data rate. A next step in the project is a theoretical study of multi-level modulation for 2D optical storage. Multi-level modulation in 2D has the potential of an overall gain of a factor of four in DATA DENSITY.
Objectives:
The further growth of information society will require larger storage capacities and faster access of growing databases and digital content. The classical roadmap for optical storage seems to come to an end, both in capacity and in data rate. We propose to develop a new/challenging concept for optical storage, in which the information written on the disc has a 2D-CHARACTER. We call this TwoDOS (Two-Dimensional Optical Storage. The aim is to generate key technologies realizing an increase over the 3rd gen: of optical storage with a factor 2 in DENSITY and a factor 10 in DATA RATE for an read-only system, based on 2D-dimensional channel coding and advanced signal processing, in combination with a read-channel consisting of a multi-spot light path realizing a parallel readout. TwoDOS will achieve a capacity of at least 50GB for a 12 cm disc, with data rate of at least 300Mb.
Work description:
The format of a TwoDOS disc will be based on a broad spiral, in which the information is recorded in the form of 2D features. Parallel read-out is realized using a single laser beam which passes through a grating producing an array of laser spots. The information is written as a honeycomb structure and is encoded with a 2D channel code, facilitating bit-detection. The array of spots scans the full width of the broad spiral. The light from each laser spot is reflected by the 2D pattern on the disc, and is detected on a photo-detector IC, generating a number of high-frequency signal waveforms. The set of signal waveforms is used as input of the 2D signal processing. The main challenges are advanced signal processing, and comprise innovative solutions for 2D channel coding, 2D timing recovery, 2D adaptive equalization and bit-detection. Major physical challenges include the mastering of discs and the design of a complete test-player with a multi-spot light-path with new lenses and gratings. Manufacturing of 2D optical discs will require a mastering technology that is capable of writing the information preferably in a single pass of the 2D broad spiral: this can only be achieved by an electron beam recorder since it allows for fast deflections of there cording beam. As part of the risk management, an alternative route using a traditional laser beam recorder for mastering will also be followed, using multiple passes to record the broad spiral. The signal processing algorithms of the TwoDOS receiver are first generated and evaluated in software; after, they are implemented in efficient low-complexity hardware. The electronics are further integrated with the test-player. The final proof-of-concept will evaluate the system margins at the target capacity of 50GB. A feasibility study will analyse the further improvement that may be expected from the combination of TwoDOS with the promising multi-level technology.
Milestones:
Major achievements to be expected are:
1) the mastering of 50 GB discs with a 2D broad spiral using an electron beam recorder;
2) the realization to double data capacity, via 2D channel coding and signal processing;
3) the integration of the signal processing hardware with the test-player;
4) the final demonstrator, showing system margins compatible with current optical drives, yet at 50 GB capacity and 300 Mb/s data rate;
5) a feasibility study of multi-level modulation for TwoDos.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences computer and information sciences software
- natural sciences computer and information sciences databases
- engineering and technology electrical engineering, electronic engineering, information engineering electronic engineering signal processing
- social sciences sociology governance crisis management
- natural sciences physical sciences optics laser physics
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Coordinator
5621 JG EINDHOVEN
Netherlands
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