Demonstrations of analog-to-digital conversion using a frequency domain stretched processor.


The first proof-of-concept demonstrations are presented for a broadband photonic-assisted analog-to-digital converter (ADC) based on spatial spectral holography (SSH). The SSH-ADC acts as a frequency-domain stretch processor converting high bandwidth input signals to low bandwidth output signals, allowing the system to take advantage of high performance, low bandwidth electronic ADCs. Demonstrations with 50 MHz effective bandwidth are shown to highlight basic performance with approximately 5 effective bits of vertical resolution. Signal capture with 1600 MHz effective bandwidth is also shown. Because some SSH materials span over 100 GHz and have large time apertures (approximately 10 micros), this technique holds promise as a candidate for the next generation of ADCs.

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@article{Reibel2009DemonstrationsOA, title={Demonstrations of analog-to-digital conversion using a frequency domain stretched processor.}, author={Randy Ray Reibel and Calvin Harrington and Jason R. Dahl and Charles Ostrander and Peter Aaron Roos and Trenton Jeffery Berg and R. Krishna Mohan and Mark A. Neifeld and Wm Randall Babbitt}, journal={Optics express}, year={2009}, volume={17 14}, pages={11281-6} }