Photonic analog-to-digital coonversion using a robust symmetrical number system
Fisher, Adam S.
Pace, Phillip E.
Powers, John P.
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A photonic analog-to-digital converter (ADC) based on a robust symmetrical number system (RSNS) was constructed and tested. The analog signal to be converted is used to amplitude modulate an optical pulse from a laser using three Mach-Zehnder interferometers (MZI). The Mach-Zehnder interferometers fold the input analog signal for a three-channel RSNS encoding. The folding waveforms are then detected and amplitude-analyzed by three separate comparator banks, the outputs of which are used to determine a digital representation of the analog signal. This design uses the RSNS preprocessing to encode the signal with the fewest number of comparators for any selected bit resolution. In addition to the efficiency of its use of comparators, the RSNS encoding has inherent Gray-code properties making it particularly attractive for eliminating any possible encoding errors. The RSNS encoding is combined with an optical infrastructure that offers high bandwidth and low insertion loss characteristics. A full implementation was constructed and tested. The lack of a high-speed data acquisition device limited the results to examining the preprocessing and digital processing separately. With the system integration of a data acquisition device, a wideband direct digital antenna architecture can be demonstrated.
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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Schafer, Jeffrey L. (Monterey, California. Naval Postgraduate School, 1995-03);Significant research in high performance analog-to-digital converters (ADCs) has been directed at retaining part of the high-speed flash ADC architecture, while reducing the total number of comparators in the circuit. The ...
Esparza, Jorge A. (Monterey, California. Naval Postgraduate School, 1993-12);This thesis investigates the feasibility of implementing an analog- to-digital converter (ADC) based on a new symmetrical number system (SNS). This preprocessing architecture decomposes the analog amplitude analyzing ...
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