Abstract
Ultra-low phase noise performance is required for frequency agile
local oscillators, which are the core for high resolution imagers,
spectrum analyzers, and high speed data communications. A forced
opto-electronic oscillator (OEO) benefits from frequency stabilization
techniques for realizing a clean and low phase noise source at microwave
and millimeter wave frequencies. Forced oscillation techniques of
self-injection locking and self-phase lock loop are combined to provide an
ultra-low oscillator phase noise both close-in and far-away from the
carrier frequency, while a tunable yttrium iron garnet microwave filter
combined with a wavelength tuned transversal filter are employed to
implement both coarse and fine frequency tuning for a tunable X-band OEO.
A phase noise of −137 dBc/Hz at an offset frequency of 10 kHz is achieved
covering the frequencies of 9 to 11 GHz with a fine frequency tuning
resolution of 44 Hz/pm and coarse tuning of 25 MHz/mA. Moreover, the long
term stability of the output signal is tested, and a maximum frequency
drift of 2 kHz is measured within 60 min for the X-band
synthesizer.
© 2017 Chinese Laser Press
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