Publications by authors named "Valentin Polo"
Article Synopsis
- Researchers have successfully applied chemical species tomography (CST) to image the exhaust plume of gas turbines used in commercial aircraft, focusing on a specific near-infrared absorbing species.
- The study employs advanced tunable diode laser spectroscopy to measure absorption spectra, capturing data across various thrust levels and utilizing multiple data inversion techniques for image reconstruction.
- Notably, the images reveal a consistent ring structure of high concentration in the exhaust, indicating promising applications for CST in advancing turbine combustion, engine development, and fuel research.
A novel photonic-vector modulator architecture for the generation of 16 quadrature amplitude modulation (16 QAM) millimeter-wave carriers using dual-drive Mach-Zehnder modulators is proposed. Experimental generation of 5 Gbits/s 4 amplitude shift-keying (4 ASK) and 10 Gbits/s 16 QAM modulated 42 GHz carriers is reported. The multilevel modulated millimeter-wave signals are demodulated using an electrical receiver and its error-vector magnitude (EVM) estimated from the measurements, obtaining EVMs of -21.
View Article and Find Full Text PDFA photonic vector modulator architecture for generating pure quadrature amplitude modulation (QAM) signals is presented. An electrical quadrature-modulated signal at microwave-millimeter-wave frequencies is generated from its corresponding baseband in-phase (I) and quadrature (Q) components. In the proposed scheme, no electrical devices apart from the electrical tone oscillator are needed in the generation process.
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