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Effects of chromatic dispersion in a waveguide Bragg grating prism based true time-delay beamforming module

Phased array antennas (PAAs) is an enabling technology in high-performance radars and wireless communications systems. The technique of photonic true time-delay (TTD) beamforming for these antennas has been studied intensively for the last few years and is considered as a key technique for wideband applications. In this paper, the effects of chromatic dispersion on a photonic TTD beamforming module are presented for the first time. The simulation results consider a true time-delay (TTD) beamforming network using a Bragg grating prism (BGP) on Ge-doped silica-on-silicon planar integrated optical waveguide. The effect of chromatic dispersion is considered on a true time-delay module using chirped Bragg gratings to introduce the time delays