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International Topical Meeting on Microwave Photonics

Wide Band&high resolution, RF spectral analysis using a high purity frequency agile laser oscillator

Vincent Crozatier, Guillaume Gorju, Fabien Bretenaker, J.-L. Le Gouët, I. Lorgeré

Published Oct 1, 2006• 0 citations
Publisher

Abstract

We report on the demonstration of the chirp transform algorithm for the optical processing of wide band RF signals. The process uses photon echoes in an Er3+:YSO crystal at 1536 nm. The analysis covers a 1.5 GHz instantaneous bandwidth together with more than 20,000 independent channels. These performances require a frequency agile laser source that is phase-locked in order to take advantage of the high coherence of the system

DOI
10.1109/mwp.2006.346535

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We present experimental results for what is to our knowledge the first spectral-hole-burning based rf spectrum analyzer to cover 10 GHz of rf analysis bandwidth. The rf signal of interest is modulated onto an optical carrier, and the resultant optical sidebands are burned into the inhomogeneously broadened absorption band of a Tm3+:YAG crystal. At the same time a second, frequency-swept laser reads out the absorption profile, which is a double-sideband replica of the rf spectrum, and thus the rf spectrum can be deduced after spectral calibration of the nonlinear readout chirp. This initial demonstration shows spectral analysis covering 10 GHz of bandwidth with >5500 spectral channels and provides 43 dB of dynamic range.