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Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next sampling...
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High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
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Demonstrations of analog-to-digital conversion using a frequency domain stretched processor.

Randy Ray Reibel1, Calvin Harrington, Jason Dahl

  • 1The Spectrum Lab, Montana State University, Bozeman, MT 59717, USA. rreibel@spectrum.montana.ed

Optics Express
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Summary

This study introduces a novel photonic-assisted analog-to-digital converter (ADC) using spatial spectral holography (SSH). This innovative technology processes broadband signals, paving the way for next-generation high-performance ADCs.

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Area of Science:

  • Photonics
  • Signal Processing
  • Analog-to-Digital Conversion

Background:

  • High-bandwidth analog-to-digital converters (ADCs) are crucial for modern electronics.
  • Existing electronic ADCs face limitations in speed and resolution for ultra-high bandwidth signals.
  • Photonic-assisted techniques offer potential solutions to overcome electronic limitations.

Purpose of the Study:

  • To present the first proof-of-concept demonstrations of a broadband photonic-assisted ADC.
  • To utilize spatial spectral holography (SSH) for frequency-domain signal processing.
  • To enable the use of high-performance, low-bandwidth electronic ADCs for wideband signals.

Main Methods:

  • Development of a spatial spectral holography-based analog-to-digital converter (SSH-ADC).
  • Employing the SSH-ADC as a frequency-domain stretch processor.
  • Demonstrating signal capture and conversion at various effective bandwidths.

Main Results:

  • Successful proof-of-concept demonstrations of the SSH-ADC.
  • Achieved approximately 5 effective bits of vertical resolution at 50 MHz effective bandwidth.
  • Demonstrated signal capture with a 1600 MHz effective bandwidth.

Conclusions:

  • The SSH-ADC technique effectively converts high-bandwidth signals to lower bandwidths.
  • SSH materials with broad spectral coverage and large time apertures show promise for future ADCs.
  • This photonic-assisted approach is a strong candidate for next-generation ADC development.