CROSS-TALK NOISE-REDUCTION IN VOLUME HOLOGRAPHIC STORAGE WITH AN EXTENDED RECORDING REFERENCE

We propose and analyze a novel method of reducing cross-talk noise in angle-multiplexed volume holographic optical storage. The method recor ds each hologram by using a reference beam that extends uniformly with in a narrow spatial frequency bandwidth but reads the memory by using a plane wave. Our result shows that the signal-to-noise ratio obtained by the proposed method can be 20 dB higher than that obtained by the conventional method with planar reference waves. In addition, the exte nded reference method has a larger tolerance for angle misalignment du ring readout than the conventional method. Results of numerical simula tion are presented and discussed. (C) 1995 Optical Society of America