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Opt Lett. 2007 Apr 1;32(7):736-8.

Spatial information transmission using axial temporal coherence coding.

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AIDO, Technological Institute of Optics, Colour and Imaging, C/. Nicolas Copernico, Paterna, Valencia, Spain.


We present an approach that can be used for transmission of information through space-limited systems or for superresolution. The spatial information is coded with different axial temporal coherence by interfering every spatial region in the input with the same region, but with a certain known delay in the longitudinal axis. Every spatial region has different delay. After mixing all of the spatial information, it is transmitted through the space-limited system. At the detection the information is passed through a similar interference setup containing certain axial delay. By temporally scanning along the longitudinal axis, each time a different spatial region that was coded with the corresponding axial delay is reconstructed. To allow coding of different spatial regions with different and small axial delays, we use a thermal light source that has very short coherence length. We include experimental validation of the presented approach.


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