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Conference on Lasers and Electro-Optics

Broadband operation of a radio frequency spectrum analyzer based on spectral hole burning

I. Lorgeré, V. Lavielle

Published Jun 25, 2003• 0 citations
Publisher

Abstract

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.

DOI
10.1109/cleo.2002.1033486

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Journal of Modern Optics•Nov 1, 2002•26 citations
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.
Summary form only given. We report on the first experimental demonstration of a broad bandwidth radio frequency spectrum analyzer 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. A set of monochromatic gratings is engraved in a SHB material. Each grating diffracts a single spectral component, with a resolution ultimately determined by the homogeneous line width of the SHB medium. A large number of gratings can coexist within the inhomogeneous width of the absorption line. By varying the engraving laser frequency in synchronism with the angle of incidence, one associates a specific diffraction angle with each specific spectral component. Therefore, the different spectral components of an incident polychromatic probe beam are diffracted and simultaneously retrieved in different directions. The grating set works as a spectrometer that is expected to exhibit MHz resolution and of GHz bandwidth.
Spectral hole-burning (SHB) technology is considered for >10-GHz instantaneous bandwidth signal-processing applications. In this context we report on what is believed to be the first demonstration of a SHB microwave spectrometer. A set of gratings engraved in a SHB crystal is used to filter one sideband of the optically carried microwave signal. The setup is confined to narrow-bandwidth operation, over a 35-MHz-wide interval. The first findings confirm the validity of the architecture in terms of spectral resolution, angular channel separation, and simultaneous detection of multiple spectral lines.
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.