Abstract
In this paper, a novel technique to realize frequency quadrupling and
upconversion in a radio over fiber (RoF) link is proposed and experimentally
demonstrated. The frequency quadrupling is achieved by using two cascaded
Mach–Zehnder modulators (MZMs) that are biased at the minimum transmission
point, with a tunable optical delay line placed between the MZMs. By properly
adjusting the time delay between the two MZMs, a pair of optical wavelengths
with a wavelength spacing corresponding to four times the frequency of the
microwave drive signal is generated. The two wavelengths are then sent to
a third MZM to which an intermediate-frequency (IF) signal is applied. At
the output of the third MZM, a frequency-upconverted signal at the millimeter-wave
(mm-wave) band is obtained. The advantages of the technique are that a relatively
low-frequency local oscillator (LO) signal is used to generate a high-frequency
LO signal and the upconverted signal is more tolerant to the dispersion-induced
power fading compared with a conventional RoF link based on double-sideband
(DSB) modulation. Experiments are performed to verify the technique.
© 2008 IEEE
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