Optical Generation and Distribution of UWB Signals

In this paper, we present two different approaches to generating and distributing UWB pulse signals in the optical domain based on optical phase modulation. In the first approach, the combination of the EOPM and the SMF link forms an all-optical microwave bandpass filter that can be designed to shape the input Gaussian pulses into UWB doublet pulses that meet the UWB spectral requirement. In the second approach, optical pulses can be generated by a Q-switched or a mode-locked laser. The phase modulation to intensity modulation (PM-IM) conversion is achieved by use of a fiber Bragg grating (FBG) that serves as a frequency discriminator. By locating the phase-modulated optical carrier at the linear slope or the quadrature slope of the FBG reflection spectrum, monocycle or doublet pulses can be obtained at the output of the PD. The experimental measurements are shown which have good agreement with the theoretical analysis