Design and Experimental Evaluation of an Electro-Optical, Sigma-Delta Modulator for Wideband Digital Antennas

Abstract

Electro-optical sigma-delta analog-to-digital converters (ADCs) use a pulsed laser to oversample an input signal at two Mach-Zehnder interferometer modulators. A fiber lattice accumulator is embedded within a feedback loop around a single-bit quantizer to spectrally shape the quantization noise to fall outside the signal band of interest. Applications of electro-optical sigma-delta ADCs include digitizing wideband radio frequency signals directly at an antenna (digital antenna). The design considerations, construction process and experimental evaluation of the electro-optical sigma-delta ADC are presented. The experimental results are compared with a computer model of the electro-optical sigma-delta sampling and digitization process.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2000
Accession Number
ADA386636

Entities

People

  • William U. Gillespie

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Distributed Feedback Lasers
  • Electronics Laboratories
  • Frequency Bands
  • Laser Diodes
  • Lasers
  • Light Sources
  • Mach Zehnder Interferometers
  • Modulation
  • Modulators
  • Optics
  • Pulsed Lasers
  • Quantum Cascade Lasers
  • Radio Frequency
  • Refractive Index
  • Semiconductor Lasers
  • Semiconductors
  • Test And Evaluation

Fields of Study

  • Physics

Readers

  • Integrated Circuit Design and Technology.
  • Optical Physics and Photonics.
  • Radar Systems Engineering.

Technology Areas

  • Directed Energy