KEYWORDS: Signal detection, Sensors, Signal processing, Binary data, Signal generators, Interference (communication), Data centers, Optical storage, Modulation transfer functions, Optical discs
We report the new data reproducing scheme for high density over 40GB per layer with a commercial Blu-ray
recordable disc. bER of 10-5 and 10-4 with 42.5GB and 45GB were experimentally obtained respectively using this new
data reproducing scheme which shows the possibility of achieving 50GB with a commercial single-layer Blu-ray disc.
We also propose a new evaluation parameter which is necessary for high density.
We report the error rate improvement of super-resolution near field structure (Super-RENS) write-once read-many (WORM) disk at a blue laser optical system. (Laser wavelength 405nm, numerical aperture 0.85) We used a disk of which carrier level (CL) of 75nm is improved from -26.3 dBm to -19.0 dBm. We controlled the equalization (EQ) profile characteristics and used the adaptive 5 symbol write strategy and advanced high tap partial-response maximum likelihood (PRML) technique in order to improve the bit error rate (bER) characteristics of the super-RENS random signal. As a result, we obtained bER of 10-4 level with new signal processing techniques and bit error analysis process. This result shows high feasibility of super-RENS technology for practical use in the near future.
KEYWORDS: Sensors, Signal processing, Optical storage, Data storage, Clocks, Digital filtering, Optical discs, Laser applications, Digital video discs, Target detection
We have studied an increasing areal density with applying novel signal processing and pulse erasing writing strategy on the BD dual layer optical disc and demonstrated the feasibility for recording 66GB and 70GB per disc. As a result, we confirmed that applied technologies would allow increase recording density by 30% with commercially available disc.
An advanced PRML data recovery system is presented for a high-density recording. The system consists of three major hardware units, which are DC offset compensator, adaptive equalizer, and Viterbi detector with level adaptation scheme. The experiment based on an improved PRML scheme and FPGA hardware realization shows highly reliable performance of data detection up to 35GB recording density. The SER experiment result for 35GB shows that the detector using the proposed PRML yields a result to meet the SER limit of 4.0x10-3 with a margin of 0.45° for tangential and 0.55° for radial tilt. And the base SER marks 7.0x10-5 when there is no tangential and radial tilt error.
KEYWORDS: Eye, Quality measurement, Detection and tracking algorithms, Signal detection, Sensors, Quality systems, Astatine, Digital video discs, Channel projecting optics, Binary data
In this paper, a new method using an eye pattern is proposed to measure the signal quality for high-density recording systems. The experiment shows that the new method has a strong relation to SER of the system using PRML algorithm.
KEYWORDS: Sensors, Detection and tracking algorithms, Signal detection, Data acquisition, Clocks, Binary data, Digital video discs, Optical discs, Data processing, Radio optics
A new fast and accurate digital frequency detection algorithm for the optical drive system is presented. The proposed algorithm, which is based on the analysis of data histograms, improves the initialization time and the detection resolution.
KEYWORDS: Eye, Signal detection, Laser stabilization, Laser marking, Laser systems engineering, Laser applications, Disk lasers, Clocks, Laser optics, Signal processing
We report the random pattern signal characteristics of the super resolution near field structure (Super-RENS) disk in a blue laser optical system. (Laser wavelength 405 nm, numerical aperture 0.85) We introduced new structure for blue laser system, which results in 43 dB carrier to noise ratio (CNR) at the 75 nm mark length signal (which is equivalent to 50 GB capacity with 0.32 micrometer track pitch) and much better readout stability were obtained. The relatively clear eye pattern, phase locked loop (PLL) state and data to clock jitter of around 20% for a 50 GB (2T:75 nm) random pattern signal were realized.
A receiver structure referred to as piecewise maximum likelihood (PML) is proposed in order to reduce the complexity of the PRML receiver. A channel response of optical disk is used for the performance evaluation. The channel distortion such as tangential tilt effect of optical disk also considered. The hardware implementation complexity between the PML and adaptive PRML is compared.
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