A Continuously-Tunable Optoelectronic Oscillator With Full Locking Range Utilizing Three Frequency Tuning Mechanisms
IEEE Transactions on Circuits and Systems I: Regular Papers(2023)
摘要
A continuously tunable optoelectronic oscillator (OEO) with three frequency tuning mechanisms is proposed to enable frequency locking covering the whole working band. Three frequency-tuning mechanisms are employed simultaneously in the OEO, including a course tuning of microwave photonic filter, a fine tuning of phase shifter and a frequency calibration of direct digital synthesizer (DDS). The introduction of frequency compensation signal achieved by DDS increases the locking range of OEO so that the lock-out problem caused by mode hopping can be effectively solved. In the proof-of-concept experiment, a 3–6 GHz tunable RF oscillating signal has been successfully verified. The locking range of the proposed OEO is extended over 11 times compared to conventional OEO. With a 500 m optical fiber inserted in the loop, the phase noise is measured to be −110 dBc/Hz at 10 kHz offset. The Allan deviation is improved from
$1.7\times 10 ^{-8}$
to
$1.6\times 10 ^{-11}$
at 1000 s averaging time. To the best of the authors’ knowledge, this is the first time that a frequency tunable OEO with full locking range has been implemented.
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关键词
Optoelectronic oscillator, phase-locked loop (PLL), frequency stability, full locking range, frequency calibration
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