Assured Capture of Transient RF Events across Extremely Wide Bandwidths

Hogan, Justin A.; Babbitt, W.R.; Benko, Craig; Bekker, Scott H.; Stiffler, Colton; Winn, Kevin; Price, Ryan; Merkel, K.D.

doi:10.1109/rapid.2019.8864412

Cited by 2 publications

(1 citation statement)

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“…However, a spectral analysis alone may not be sufficient to perform full signal recognition and could require more advanced pre-processing functions such as frequency filters, true time delays and down-converting stages [7], [11]. RF filtering in the optical domain is a valuable choice which allows to tune filters very quickly over a wide frequency band, due to the small bandwidth of the RF signals compared to optical frequencies.…”

Section: Introductionmentioning

confidence: 99%

High Rejection and Frequency Agile Optical Filtering of RF Signals Using a Rare Earth Ion-Doped Crystal

Ulrich

Welinski

Chauvet

et al. 2022

J. Lightwave Technol.

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While photonics is broadly considered as a leading solution for analog RF processing, photonic RF filters often show a limited out-of-band rejection. In this work we demonstrate a high rejection and high steepness photonic RF bandpass filter based on spectral hole burning in a rare earth ion-doped crystal. The filter is obtained by programming a frequency-selective absorption grating in the crystal. With an experimental and theoretical study we identify the optimal parameters for this filter. We achieve a remarkable rejection of 60 dB and a rejection of 45 dB at 50 MHz from the edge of the filter, 20 dB higher than most photonic RF filters and compliant with most demanding applications.

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Section: Introductionmentioning

confidence: 99%