3 November 1998 Improved resolution of photonic A/D conversion using oversampling techniques
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Abstract
The majority of the signals encountered in nature ar analog while the preferred method of processing these signals is digital. Digital signal processors provide higher resolution, improved flexibility and functionality, and improved noise immunity over its analog counterparts. As a result, the analog-to-digital, (A/D) interface is generally considered to be the most critical part of any signal acquisition and processing systems. Because of the difficulty in achieving high-resolution and high-speed A/D converters, this A/D interface has been and continues to be a barrier to the realization of high-speed, high-throughput systems. Electronic A/D techniques have been investigated but appear to be limited. (Sigma) (Delta) techniques have been successful in providing high-resolution converters but only for audio frequency signal. Optical approaches have also ben investigated to leverage the wide bandwidth and parallelism of optics but most have been limited by the component linearity, device speed, or dynamic range. We previously proposed and demonstrate an optical approach to A/D conversion based on oversampling techniques using a modification of the (Sigma) (Delta) architecture and multiple quantum well modulators as the optical devices. Here we describe other approaches to oversampling A/D conversion incorporating space-time processing of optical signals leading to ultra-high resolution at very high speed.
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Barry L. Shoop, Barry L. Shoop, Pankaj K. Das, Pankaj K. Das, Daniel M. Litynski, Daniel M. Litynski, } "Improved resolution of photonic A/D conversion using oversampling techniques", Proc. SPIE 3463, Photonics and Radio Frequency II, (3 November 1998); doi: 10.1117/12.330386; https://doi.org/10.1117/12.330386
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