Photonic generation of background-free millimeter-wave ultra-wideband signals

We review the recent progress of photonic generation of millimeter wave(MMW)-ultra-wideband(UWB) signals. To fully satisfy the standard defined by the Federal Communications Commission(FCC), the baseband signal(background signal) and the residual local oscillator(LO) signal should be well controlled. We discuss several schemes in this work for generating background-free MMW-UWB signals that are fully compliant with the FCC requirement.