Abstract
A simple scheme to generate a frequency and bandwidth-doubling dual-chirp microwave waveform based on a dual-polarization Mach–Zehnder modulator (DPol-MZM) is presented, and the influence of fiber chromatic dispersion during transmission is analyzed in detail. In this scheme, the lightwave is split into two beams in the DPol-MZM, and one beam is modulated via sub-MZM1 by the RF signal to generate two second-order sidebands along with the optical carrier, while the other beam is modulated via sub-MZM2 by a single-chirp microwave with single sideband modulation. By adjusting the angle between the PBC and the principal axis of Pol, the output lightwave from the DPol-MZM is linearized and the optical carrier is eliminated. After optical to electrical conversion, a dual-chirp microwave waveform with doubled carrier frequency and doubled bandwidth is generated. The generated waveform can effectively avoid the power fading caused by chromatic dispersion as it is transmitted through the fiber. According to the simulation, the ambiguity function and autocorrelation of the generated waveforms show that the generated dual-chirp microwave waveforms at 20 GHz with 4 GHz bandwidth have good performance even after 30km fiber transmission. The simulation results agree well with our theoretical prediction. The system has a simple structure, good reconfigurability and tunability, and is expected to use in the radar systems.
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