Abstract
A scheme for the photonic generation of frequency-tunable millimeter wave and
terahertz wave signals based on a highly flat optical frequency comb is proposed and
demonstrated experimentally. The frequency comb is generated using two cascaded
phase modulators (PMs) and an electro-absorption modulator (EAM). The frequency comb
covers a 440-GHz frequency range, with 40-GHz comb spacing and less than 2-dB
amplitude variation. By filtering out two of the comb lines with 50 dB out of the
band suppression ratio, high frequency-purity and low phase noise millimeter wave or
terahertz wave signals are successfully generated, with frequencies ranging from 40
to 440 GHz.
© 2012 Chinese Optics Letters
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