Title :
Unitary matrices for phase-coded holographic memories
Author :
Horn, W. ; Berger, G. ; Dietz, M. ; Zhang, X. ; Denz, C.
Author_Institution :
Westfalische Wilhelms Univ., Munster
Abstract :
Volume holographic data storage based on phase-code multiplexing is a promising technology for next generation optical storage devices. Volume holographic memories offer high storage capacities and short data access times through multiplexing and a page-oriented storage principle. Multiple holograms can be recorded in the storage media through various multiplexing techniques, such as angular, phase-code, wavelength or shift multiplexing. Among the different methods, deterministic phase-code multiplexing has been widely investigated since it entails several advantages. This method allows recording and retrieval of data pages without introducing moving parts or frequency-shifting elements into the setup, which results in a fast access speed. Crosstalk analyses have shown that the signal-to-noise ratio (SNR) of phase-code multiplexing is significantly higher than those of wavelength or angle multiplexing. In addition, phase-code multiplexing offers the potential of performing parallel optical operations of stored images, associative data search and enables powerful address based encryption techniques. this contribution, we present a novel type of matrices - unitary matrices (U-matrices) for phase-code multiplexed holographic memories.
Keywords :
holographic storage; matrix algebra; multiplexing; phase coding; address based encryption techniques; associative data search; crosstalk analyses; next generation optical storage devices; page-oriented storage; parallel optical operations; phase-code multiplexing; phase-coded holographic memories; signal-to-noise ratio; unitary matrices; volume holographic data storage; Frequency; Holographic optical components; Holography; Information retrieval; Memory; Optical crosstalk; Optical devices; Optical recording; Signal analysis; Signal to noise ratio;
Conference_Titel :
Lasers and Electro-Optics, 2007 and the International Quantum Electronics Conference. CLEOE-IQEC 2007. European Conference on
Conference_Location :
Munich
Print_ISBN :
978-1-4244-0931-0
Electronic_ISBN :
978-1-4244-0931-0
DOI :
10.1109/CLEOE-IQEC.2007.4386038