Tridstore IP LLC

Andrey Mikhailov

Eugene Levich

Nikolay Magnitskii

Sergei Magnitskii

An EET (&ldquo;eight-to-ten&rdquo;) method has been proposed for two-dimensional spatial encoding of information stored in two- or three-dimensional, in particular fluorescent optical carriers. The method specifically ensures the same writing density as DVD carriers with EFM (&ldquo;eight-fourteen modulation&rdquo;) modulation code but for 0.8&times;0.4&mgr; information pit (fluorescent mark), i.e. as in CD data carriers. The larger&mdash;as compared to the DVD format&mdash;pit size enables a simpler technology for manufacturing fluorescent multilayer carriers, for instance of ROM type, and a stronger fluorescent signal in reading. The high writing density is ensured through virtually 100% filling of the information layer area with fluorescent marks in a gap-free manner. In addition, this allows application of the parallel data reading procedure and a ten-fold higher reading speed than in DVD systems. Increasing the size of the channel bit to 0.4 &mgr;m&mdash;which is 1.5 and 3 times higher than for CD and DVD formats, respectively&mdash;allows a significant reduction in the frequency band and hence in photoreceiver noises. For equal values of the reading radiation wavelength and numerical aperture of the objective lens used, the proposed ETT (&ldquo;eight-to-ten&rdquo;) method of two-dimensional encoding in fluorescent carriers enables a significant lower magnitude of reading error probability in contrast to existing optical information carriers of DVD-type. It is also applicable to other write-once and rewritable optical data carriers based on various physical and chemical principles of forming information pits.

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Moscow, Russia

Andrey Mikhailov