Abstract
We show a simple, convenient, and cost-effective scheme for tunable frequency
upconversion at millimeter-wave band without a local oscillator. By launching a
2.5-Gb/s directly modulated baseband signal into a Fabry-Pérot laser diode (FP-LD),
the mode of the FP-LD is locked by the high-order sideband of the injected signal.
The beating frequency of the injection-locked mode and the injected signal can
generate upconversion subcarriers. In our experiment, tunable frequency subcarriers
of 28.4, 29.3, and 30.5 GHz are obtained without any radio-frequency local
oscillator. The single sideband phase noises of ?83.88, ?76.36, and ?78.54 dBc/Hz @
10 kHz (at 28.4-, 29.3-, and 30.5-GHz subcarriers, respectively) are shown. The
proposed scheme has potential to generate much higher frequency carriers.
© 2014 Chinese Optics Letters
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