This paper reviews the analyses and the experimental results of Micro-reflector optical disc system. In Micro-reflector
optical disc, data are recorded on multiple virtual planes in a monolithic holographic medium. We have demonstrated
the possibility of huge capacity from our analyses of readout characteristics of the Micro-reflector. In addition, we have
developed the five-axis servo control system in order to achieve precise control of two counter-propagating light spots in
recording media. Using this system, we succeeded in four-layer recording/readout.
KEYWORDS: Signal detection, Optical discs, Digital video discs, Modulation, Signal processing, Quadrature amplitude modulation, Digital modulation, Data conversion, Data storage, Eye
We propose a method to record a multilevel signal onto an optical read only memory disc. In this method, we use the signal processing to generate the multilevel recording signal, which satisfies zero-intersymbol interference condition and zero-direct current condition. The resultant multilevel signal is emboss recorded as position displacement of groove walls. To playback a disc, the push- pull detection and the adaptive equalizer is used. Experimental disc of 0.6 micron trackpitch and a 0.28 micron/bit of density is made. When a DVD equivalent optical pickup is used to playback this disc, we confirm the error rate of 3 X 10-4 and a clear 2D eye pattern of 16 levels.
Single carrier independent pit edge recording (SCIPER) stores data by modulating the position of the leading and trailing pit edges in very small (0.04 micrometers ) discrete steps. With this method we are able to achieve double the compact disc recording density while using a standard CD pick up. In this paper we review the principles of the SCIPER optical disc system and describe a noise reduction method based on the BCH error correction code. Incorporating of this noise reduction circuit improves the robustness of the SCIPER system against additive noise by 2.8 dB. The possibility of applying more advanced coding techniques such as Trellis coded modulation is also discussed.
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