M. Bolea, J. Mora, B. Ortega, and J. Capmany (Spain)
Signal processing, UWB Radio, Reconfigurable Radio
We demonstrate experimentally an optical architecture to generate high-order Ultra-Wideband pulses over optical fiber. The system is based on a 4-tap reconfigurable microwave photonic filter by using phase inversion in a Mach-Zehnder modulator. Conventional pulses such as monocycle and doublet pulses are experimentally implemented. However, we consider the possibility to extend the system to a larger number of positive and negative coefficients for generating high-order UWB pulses. This reconfiguration capability permits the generation of Ultra-Wideband pulses satisfying successfully the FCC regulation. Moreover, the photonic Ultra-Wideband pulse generator can be adapted to support different pulse modulation formats since the amplitude, polarity and time delay of generated pulses can be controlled with a reconfiguration time up to tens of nanoseconds. Therefore, Pulse Position Modulation, Pulse Polarity Modulation or Bi-Phase Modulation, Pulse Amplitude Modulation, On-Off Keying modulation and Orthogonal Pulse Modulation (OPM) are simultaneously achieved in our approach.
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