This invention enables the low cost fabrication of an optical-electronic semiconductor device for that operates at wavelengths above 1.2 microns, particularly for optical communication systems. This technology overcomes many of the current problems facing optical communications systems. This GaInNAs materials system is very promising for this application as it allows the fabrication of VCSELs at 1.3 um by combining a 1.3 um active region with the already well-developed AlAs/GaAs mirror technology.
This invention increases the storage capacity for video images in holographic media by reducing the crosstalk between adjacent images. The method uses a differential approach, where changes with respect to a base image are recorded rather than the images themselves. The technique eliminates the recording of redundant images, such as background images, and thus reduces the average intensity of the stored pages. Reduced image intensities lead to reduced interpage crosstalk and increased data storage capacities. The differential technique also enables coherent video compression, which eliminates the need for the time-consuming encoding and decoding steps required in electronic compression. Thus, the invention enables a high capacity video image storage system with rapid readout capabilities.
Ginzton Laboratory - AP 207 - Stanford University - Stanford, CA 94305-4088
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Email: photonics@stanford.edu
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