Article | REF: E3334 V1

Microwave Photonics Optical processing of microwave signals

Authors: Jean CHAZELAS, Daniel DOLFI

Publication date: October 10, 2017

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ABSTRACT

Optical signal processing of microwave signals is a major application field for photonics technologies, especially in the architectures of electromagnetic sensors. Since the beginning of the second millennium, numerous research activities have been devoted to producing photonic architectures that can implement signal processing functions with performance objectives in terms of frequency selectivity, simplified architectures and spectral bandwidth. This article reviews the different optical architectures for time delay synthesis, filtering microwave signals, and associated signal processing functions.

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AUTHORS

  • Jean CHAZELAS: Scientific Director Thales DMS, Élancourt, France

  • Daniel DOLFI: Head of Physics Group Thales research and technology France, Palaiseau, France

 INTRODUCTION

Given the availability of optoelectronic components operating at very high frequencies (> 20 GHz), it is now possible to envisage microwave signal processing architectures covering the following functions: antenna control architectures, delay lines, microwave signal filtering functions, spectral analysis.

Microwave signal filtering is a basic building block in the architecture of electromagnetic sensor transmission/reception chains for telecommunications and radar systems. Whether they are rejection or bandpass filters, filter functions increase in complexity according to the number and frequency range of the signals to be filtered, and their respective bandwidths. In the early 2000s, a great deal of research was carried out into optical architectures capable of implementing filtering functions, with the main objectives being performance in terms of frequency selectivity, architectural simplification and bandwidth. The main challenge of the 2000s has been to develop optical architectures with negative coefficients, enabling us to overcome the main limitations of optical architectures. In this article, we describe these architectures and review the different types of optical architectures for filtering microwave signals and the signal processing functions associated with them.

At the end of the article, readers will find a glossary and a table of the symbols and acronyms used.

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KEYWORDS

optical architectures   |   optical filtering of microwave signals   |   true time delay synthsesis   |   wavelength multiplexing


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