Ultra-Wideband gaussian monocycle and doublet pulse generation using a reconfigurable photonic microwave delay-line filter

Ultra-Wideband (UWB) pulse generation using a reconfigurable photonic microwave delay-line Alter is proposed and demonstrated. When the Alter is configured as a two-tap delay-line Alter with coefficients of (1, -1) or a three-tap delay- line Alter with coefficients of (1, -2, 1), Gaussian monocycle or doublet pulses are generated. The proposed photonic microwave delay-line Alter is implemented using a polarization modulator (PoIM), a length of polarization maintaining Aber (PMF), and a balanced photo-detector (BPD). In the experiment, Gaussian monocycle and doublet pulses with a fractional bandwidth of about 170 % and 130 % are obtained. Since the pulse shape is related to the time-delay difference in the microwave delay-line filter, the influence of the time-delay difference on shape of the generated monocycle and doublet is also studied.