Abstract
We have investigated the improvement in the phase noise of a 10 GHz
optoelectronic oscillator using all-photonic gain as compared to using an electronic
amplifier in the cavity. The optoelectronic oscillator achieves the necessary RF gain
for oscillation by using the carrier-suppression technique of a low-biased Mach-Zehnder
modulator (MZM) followed by optical amplification. The measured RF gain due to this
all-photonic technique is as high as 15 dB and matches well with theoretical
predictions. The phase noise of the generated 10 GHz signal is at least 10 dB lower than
the signal from the same oscillator using an electronic amplifier. The improvement in
the phase noise is due to the lower RF noise figure of the all-photonic gain process as
compared to the electronic amplifier configuration.
© 2009 IEEE
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