| 摘要 |
Thus, in conventional, one-dimensional optical storage, the data is arranged in a linear fashion and is read out by a single spot (102). In order to increase data rates and storage capacity, it has been proposed to arrange the data in an isotropic, hexagonal lattice (200) and employ multiple spots (202) for read-out. Due to the high bit-intensity, 2D inter symbol interference (ISI) has a significant effect on bit detection. Aberrations in the readout spots (202) can change the form of ISI and, therefore, hamper 2D bit detection. Thus, a method and apparatus is proposed, wherein by evaluating the ISI of the readout spots (202) by scanning over a known calibration pattern, i.e. a bit pattern selected such that its optical response is characteristic of the shape of the readout spot, the aberrations in the readout spot can be determined and beneficially compensated for, as required. ® KIPO & WIPO 2007
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