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Communication Dans Un Congrès Année : 2014

20 GHz instantaneous bandwidth RF spectrum analyzer with high time-resolution

Résumé

We report on the experimental demonstration of a multi-gigahertz bandwidth RF spectrum analyzer exhibiting a resolution below 20 MHz, based on spectral hole burning in a rare-earth ion-doped crystal. To be compatible with demanding real-time spectrum monitoring applications, our demonstrator is designed to reach a high time resolution. For this purpose, we implemented the so-called "rainbow" architecture in which the spectral components of the incoming signal are angularly separated by the crystal, and are then acquired with a pixelated photodetector. The Tm 3+ :YAG crystal is programmed with a semiconductor DFB laser which frequency scan is servo-controlled and synchronized with the angular scan of a resonant galvanometric mirror, while a high-speed camera is used to acquire the spectra. In the perspective of future implementation within a system, the crystal is cooled below 4 K with a closed-cycle cryostat. With this setup, we have been able to monitor and record the spectrum of complex microwave signals over an instantaneous bandwidth above 20 GHz, with a time resolution below 100 µs, 400 resolvable frequency components and a probability of intercept of 100 %.
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Dates et versions

hal-02108553 , version 1 (24-04-2019)

Identifiants

  • HAL Id : hal-02108553 , version 1

Citer

Perrine Berger, Muriel Schwarz, Stéphanie Molin, Daniel Dolfi, Loïc Morvan, et al.. 20 GHz instantaneous bandwidth RF spectrum analyzer with high time-resolution. 2014 International Topical Meeting on Microwave Photonics (MWP) jointly held with the 2014 9th Asia-Pacific Microwave Photonics Conference (APMP), Oct 2014, Hokkaido, France. pp.331-334. ⟨hal-02108553⟩
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