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Photorefractive spatial solitons have been recently implemented to achieve electro-optically activated beam manipulation functions, such as intensity modulation and two channel routing, the devices themselves self-integrated in the bulk. The basic idea is to first generate a soliton in an otherwise homogeneous crystal, and then to use the refractive index pattern to guide longer wavelength, nonphotorefractively active, beams, for which it is effectively permanent. At this stage, a quadratic electro-optic response allows the activation and alteration of the original pattern, by changing the external bias, a process which provides device functionality during readout. This is the result of the beating between the traces of the soliton-supporting space-charge field and the now controlling external bias.

Claudio Crognale and Luigi Rosa, “Vector Analysis of the Space-
Charge Field in Nonconventionally Biased Photorefractive Crystals”
, Journal of Lightwave Technology, Vol. 23, No. 6, pp. 2175-2185, June 2005.
Claudio Crognale and Luigi Rosa, “Non-conventional biasing scheme for re-configurable bulk optical beam polarization converters based on centrosymmetric photorefractive crystals”, U.S. Patent, pending.

For a complete list of publications concerning spatial soliton-based applications please visit http://edelre.tripod.com/thebircuitpage/id9.html . In order to obtain the complete source code for the numerical simulation of photorefractive crystals please click here. For any further information please email us.
New - AI Trader
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New - Speaker Verification System
 Text-Independent Speaker Authentication There are two major applications of speaker recognition technologies and methodologies. If the speaker claims to be of a certain identity and the voice is used to verify this claim, this is called verification or authentication.
 
New - Java Face Recognition
 Java-based Biometric Authentication System Face recognition is essential in many applications, including mugshot matching, surveillance, access control and personal identification, and forensic and law enforcement applications.
 
New - Software References
 Papers and lectures A list of papers that included Advanced Source Code .Com in the references section. If you have written a paper where our software is cited in the references list please email us and your work will be published at our web site.
 
New - White Papers
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New - WebCam Face Identification
 Face Recognition Based on Fractional Gaussian Derivatives Local photometric descriptors computed for interest regions have proven to be very successful in applications such as wide baseline matching, object recognition, texture recognition, image retrieval, robot localization, video data mining, building panoramas, and recognition of object categories.
 
New - Speaker Recognition System
 Source code for speaker recognition
Speaker recognition is the process of automatically recognizing who is speaking on the basis of individual information included in speech waves.
 
New - Speech Recognition System
 Source code for isolated words recognition
Speech recognition technology is used more and more for telephone applications like travel booking and information, financial account information, customer service call routing, and directory assistance. Using constrained grammar recognition, such applications can achieve remarkably high accuracy.
 



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