Accession Number:

ADA275663

Title:

Advanced Optical A/D Converter

Descriptive Note:

Final rept. 29 Apr 1988-30 Nov 1992

Corporate Author:

BOEING DEFENSE AND SPACE GROUP SEATTLE WA

Report Date:

1993-05-01

Pagination or Media Count:

58.0

Abstract:

This program demonstrated the potential of optical techniques for superior wideband analog-to-digital AD conversion. The key performance goals were a signal bandwidth of at least 1.5 GHz with precision of more than 4 bits. The approach should have potential for eventual significant extension beyond these performance levels. Signal bandwidths of more than 10 GHz, with precision of 8 bits, were long term goals. To summarize the final results, an experimental simulation of a four-channel optical analog-to-digital converter ADC operating at 4 GSs with 2-GHz bandwidth was conducted. The precision obtained in the bandpass sampling mode near 10 GHz was 3.8 bits. For baseband signals of up to 2 GHz, the measured precision was 4.6 bits. This performance exceeded the original program goals and constitutes the best known performance obtained with an optics-based ADC approach. The optical ADC technique developed offers potential performance of 10 GHz bandwidth, 20 gigasamplessec GSs sampling rate, and precision of 6 bits or more. A secondary result from the testing was the development of a data reduction methodology that revealed a previously unreported correlation between jitter and pulse-energy fluctuations. The calculated jitter was twice as small as that derived using a commonly used power spectral density analysis that assumes no correlation between these quantities.

Subject Categories:

  • Electrical and Electronic Equipment
  • Lasers and Masers
  • Electrooptical and Optoelectronic Devices

Distribution Statement:

APPROVED FOR PUBLIC RELEASE