High-speed signal reconstruction for an RF spectrometer based on laser speckle imaging

Matthew J. Kelley; Thomas J. Shaw; George C. Valley

doi:10.1117/12.2650459

13 March 2023 High-speed signal reconstruction for an RF spectrometer based on laser speckle imaging

Matthew J. Kelley, Thomas J. Shaw, George C. Valley

Proceedings Volume 12420, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XVI; 124200L (2023) https://doi.org/10.1117/12.2650459
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

We have previously demonstrated a microwave photonic spectrometer based on laser speckle pattern imaging in which laser is modulated with the RF signal, transmitted through a long multimode optical fiber and the speckle pattern is measured [1]. The spectrometer is calibrated by associating a set of calibration RF tones to speckle patterns. Unknown signals can then be identified by correlation with the calibration set. The spectrometer is capable of achieving MHz-level resolution over a 17-GHz frequency range, which compares favorably with the best real-time microwave spectrum analyzers. However, the speed of the instrument is wanting in comparison to conventional RF electronics and the footprint is large due to the 100 meters of potted fiber. To increase speed, we incorporate a high-speed camera capable operating at up to 800 kHz frame rate, effectively increasing the data acquisition rate by a factor of 16,000. We present updated analysis of the spectrum recovery towards an increase in spectral recovery rate. Additionally, in the interest of miniaturization, we present the results of simulations of a 50-μm wide, 40-cm long multimode waveguides in silicon nitride or silicon that suggest that they can replace the 100-m long multimode fiber can be replaced by short waveguides without degradation in performance.

Conference Presentation

Citation Download Citation

Matthew J. Kelley, Thomas J. Shaw, and George C. Valley "High-speed signal reconstruction for an RF spectrometer based on laser speckle imaging", Proc. SPIE 12420, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XVI, 124200L (13 March 2023); https://doi.org/10.1117/12.2650459

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