Photonic generation of millimeter-wave ultra-wideband monocycle signal using up-conversion based on stimulated Brillouin scattering effect

摘要

We propose a novel scheme for photonic generation of millimeter-wave (MMW) ultra-wideband monocycle signal free of strong local oscillation (LO) and low-frequency component. A theory and a mathematical model are built to investigate the proposed scheme. Firstly, a differentiator is implemented using a dual-drive Mach-Zehnder modulator to attain monocycle pulses by differentiating a series of Gauss pulses. Subsequently, a dual-parallel Mach-Zehnder modulator and stimulated Brillouin scattering effect are employed to realize single-sideband modulation for up-converting the monocycle pulses to the MMW band. In the calculation, the generated signal is centered at 26GHz with 10-dB bandwidth of 7GHz and its power efficiency is about 50.08%. In addition, on-off keying modulation, amplitude modulation (PAM) and pulse position modulation monocycle pulses are generated. The spectrum of the generated signal meets with the FCC mask efficiently, so this technique has a potential application in MMW radar communication systems.