Stabilization of Fast Laser Chirps with Multi-Stage Correction Control for Time-Reversal of Broadband Radiofrequency Signal

• Published in: 2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) p. 1
• Main Authors: Llauze, Thomas, Louchet-Chauvet, Anne
• Format: Conference Proceeding
• Language: English
• Published: IEEE 26-06-2023
• Subjects: Chirp; Europe; Laser stability; Measurement by laser beam; Radio frequency; RF signals; Scattering
• ISSN: 2833-1052
• DOI: 10.1109/CLEO/Europe-EQEC57999.2023.10231848

Time reversal (TR) is a signal processing operation based on the time invariance of the wave propagation equation. It is notably used to focus a wave in an inhomogeneous medium, allowing to improve the signal transmission. Indeed, when propagating in an inhomogeneous medium, a radio frequency (RF) signal is distorted by multiple scattering and multiple paths. In a non-stationary propagation medium, it is necessary to minimize the latency between the impulse response measurement and the emission of the time-reversed signal in order to continuously adapt to the medium. The TR of RF signals with a digital method is limited by the latency and BW of the analog-to-digital conversion (ADC) that cannot be maximized simultaneously.