Photonic Generation of Reconfigurable Orders Ultrawideband Signals by Using Cascaded RSOAs

We experimentally demonstrate an ultrawideband (UWB) signals generation scheme with reconfigurable orders using cascaded reflective semiconductor optical amplifiers. Through controlling the gain saturation effect of this cascaded structure, a quasi-high-pass radio frequency filter with tunable cutoff frequency is realized. After passing through this filter, the coded Gaussian like pulse is converted to first-, second-, and third-order UWB signals. All achieved UWB signals accord with the Federal Communications Commission regulations and the third-order UWB signal can eliminate interference with other wireless communications in low frequency range.