Abstract
Photonic generation of a phase-coded or frequency-chirped microwave waveform with a tunable microwave
carrier frequency using a frequency-tunable optoelectronic oscillator (OEO) is proposed and experimentally
demonstrated, for the first time to the best of our knowledge. In the proposed system, the tunable OEO has functions
to generate a frequency-tunable microwave signal and to output an optical sideband. The optical sideband and a portion
of the light wave from the OEO laser source are sent to a polarization modulator (PolM), with their polarization
directions aligned with the two principal axes of the PolM. An electrical signal is applied to the PolM, and two
complementary phase-coded or frequency-chirped light waves are generated which are converted to an electrical signal
by beating the light waves at a high-speed photodetector. The key significance of the technique is that a phase-coded
or frequency-chirped microwave waveform with a tunable microwave carrier frequency and a reconfigurable phase-coding
or frequency-chirping pattern can be generated without using a separate microwave source. The technique is
experimentally verified. The generation of a binary- and a polyphase-coded microwave waveform with a microwave carrier
frequency at 10 and 15 GHz is demonstrated. The generation of a linearly frequency-chirped microwave waveform
with a chip rate of 20.98 GHz/ns at a 10-GHz carrier frequency and 22.5 GHz/ns at a 15-GHz carrier frequency
is also achieved.
© 2013 IEEE
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