Abstract

We report the random pattern signal characteristics of the super resolution near field structure (Super-RENS) disk in a red laser optical system. (Laser wavelength 659 nm, numerical aperture 0.6) We improved the signal quality by introducing new structure, which results in 45 dB carrier to noise ratio (CNR) at 173 nm pit length. It is equivalent to 50 GB capacity if it is converted by (Blu-ray Disc) BD specification according to the ratio of beam size. We also improved the noise characteristics and the readout power margin by optimizing the layer design and pit structure. The eye pattern under phase locked loop (PLL) state could be obtained through Equalization (EQ) adjustment. Through above improvements, we obtain the bER of 4.6⨉10^-4 at 50GB capacity level by using partial response maximum likelihood (PRML) method.

© 2005 Optical Society of America