that are orthogonally polarized are generated which are sent to
the polarizer to make the two signals projected to the same polarization direction and then beat at another 25-GHz PD with a
responsivity of 0.5 A/W (Newport, model 1414). The power
of the input light wave is about 0 dBm. A phase-coded or
frequency-chirped microwave signal is thus generated. The tem-
poral waveform of the signal is monitored by a real time oscillo-
scope (Agilent, DSO-X93204A, 80Gsa/s). By programming the
phase-coding or frequency-chirping signal from the AWG, an
arbitrary phase coded or a frequency-chirped microwave wave-
form is generated.