Phase shifter and phase response of PD in phased-array antennas

摘要

We study the phase requirement in phased-array antennas. Firstly, we present a tunable and wideband microwavephotonic phase shifter based on polarization-dependence of the LiNbO_3 Mach-Zehender modulator (MZM).With theproposed device, the phase of the optical microwave signal output from the polarizer can be tuned from 0 to 360 degreeby simply adjusting the polarization direction of the lights whereas the amplitude keeps constant. A full range tunablephase shifting in the frequency range of 10 - 35 GHz is achieved. Secondly, we focus on the photodetector (PD) phaseresponse with different input optical power and different PD. We study the Phase Retardation in InGaAs Photodetectors.The phase response of different PDs will affect the phased-array antennas.