AI Article Synopsis
- A new photonic method for measuring multiple radio frequencies (RF) using stimulated Brillouin scattering (SBS) has been developed, offering high accuracy and frequency resolution.
- The technique involves SSB modulation of two-tone signals on an optical carrier, allowing for effective bandwidth control and detection of RF signals.
- An experiment demonstrated the ability to measure RF frequencies between 0.3 GHz and 7.6 GHz with a high precision of less than 1 MHz error and a frequency resolution significantly better than 10 MHz.
Article Abstract
A photonic-assisted multiple radio frequency (RF) measurement approach based on stimulated Brillouin scattering (SBS) and frequency-to-time mapping with high accuracy and high frequency resolution is reported. A two-tone signal is a single-sideband (SSB) modulated on an optical carrier via a dual-parallel Mach-Zehnder modulator to construct one SBS gain and two SBS losses for SBS gain bandwidth reduction. The unknown RF signal is also SSB modulated on a carrier that has been modulated by a sweep signal, thus the unknown RF signal is converted to a sweep optical signal along with the sweep optical carrier. The bandwidth-reduced SBS gain spectrum is detected by the sweep optical signals at different specific time, mapping the RF frequencies to the time domain. An experiment is performed. RF frequencies from 0.3 GHz to 7.6 GHz are simultaneously measured with a root mean square error of less than 1 MHz. In addition, the frequency resolution of the measurement can be much lower than 10 MHz, which is now the best result in the RF frequency measurement methods employing the SBS effect.
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| http://dx.doi.org/10.1364/OL.428788 | DOI Listing |
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