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Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Broadband frequency agile radio-frequency spectrum analyzer based on spectral hole burning

V. Lavielle, I. Lorgeré, J.-L. Le Gouët, S. Tonda, Daniel Dolfi, J.-P. Huignard

Published Nov 15, 2004• 0 citations
Publisher

Abstract

In this paper, we demonstrate broadband frequency agile radio-frequency spectrum analyzer based on spectral hole burning with instantaneous bandwidth exceeding 2 GHz, a resolution of 500 kHz, and a dynamic range of 33 dB. The unique important features such as multiscale spectral analysis and optical carrier suppression are also demonstrated.

DOI
10.1109/cleoe.2003.1313563

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In this paper, we demonstrate broadband frequency agile radio-frequency spectrum analyzer based on spectral hole burning with instantaneous bandwidth exceeding 2 GHz, a resolution of 500 kHz, and a dynamic range of 33 dB. The unique important features such as multiscale spectral analysis and optical carrier suppression are also demonstrated.
Operation of a wideband, versatile optical spectrum analyzer for radio-frequency (RF) signals is demonstrated. The device is based on spectral hole burning (SHB). The demonstration features 2.3-GHz instantaneous bandwidth, 500-kHz resolution, and a 32-dB dynamic range. A true RF signal, transferred to the optical carrier with the help of a Mach-Zehnder modulator, is analyzed with optical carrier suppression and zooming capabilities. This is to the authors' knowledge the largest instantaneous bandwidth ever demonstrated for a SHB-based processor in rare-earth-doped crystals.
We demonstrate application of spectral hole burning to the spectral analysis of broad-band rf signals. In quite the same way as an acousto-optic spectrometer, the device operates on an optically carried rf signal and achieves angular separation of the signal spectral components. An instantaneous bandwidth of 2.5 GHz has been achieved, with a power dynamic range of 35 dB, limited by the detector. Extension to greater than 10 GHz instantaneous bandwidth with greater than 1000 channels is consistent with the active material capabilities.
We demonstrate the first 10-GHz instantaneous bandwidth radio-frequency spectrum analyzer based on spectral hole burning in Tm/sup 3+/:YAG. It exhibits 10 000 frequency channels and a resolution better than 1 MHz. Thanks to the fast and linear chirping capabilities of the laser used, it has a potential 100% probability of interception and a response time in the millisecond range. Its linear dynamic range of 16 dB is presently essentially limited by the modest amount of optical power available and can be further improved.
Summary form only given. We recently demonstrated the principle of radio frequency spectrum analysis based on the engraving of multiple monochromatic gratings in a Spectral Hole Burning (SHB) material. This device is considered for applications in radar and sub-millimeter wave astronomy. In the first experiment, the frequency scanning procedure limited the bandwidth to 35 MHz. With a new broadband setup we have achieved an instantaneous bandwidth of 2.5 GHz and demonstrated the spectral zooming capability of the analyzer.