In this paper we propose a method to improve the optical resolution for reading out optical discs, without making the spot size on the disc smaller than the diffraction limit. The idea is to reconstruct the bit pattern from the complete field profile (including amplitude and phase) of the light reflected from the disc. Phase and amplitude information are measured by picking up the wave front into different modes of a bimodal waveguide. Once picked up, these modes can be split by a photonic integrated circuit to be measured by separate detectors. By combining the information from the responses from the different modes, the bit error rate can be improved substantially.
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