Abstract
We demonstrate a phase-stability radio-frequency (RF) dissemination system via fiber link with direct phase discrimination. The phase fluctuation of the RF signal is identically transferred to a 10 MHz intermediate frequency (IF) by using dual-heterodyne phase error transfer. It guarantees that the phase discrimination of the IF signals and the atomic clock frequency signal can be directly performed without the frequency division or multiplication. This scheme can enhance the frequency stability of the dissemination system by mean of higher precision phase detection and high noise suppression capability. Experimentally, the residual phase noise of compensated system with improved phase detection scheme is -50 dBc/Hz and -67 dBc/Hz at 0.01 Hz and 1 Hz frequency offset, respectively, the RMS timing jitter in the frequency range from 0.01 Hz to 1 MHz reaches about 50 fs. Compared with the frequency division and multiplication methods, the frequency stability is improved nearly one orders of magnitude to 5 × 10 -17 at 2000 s averaging time.
Highlights
The transfer of ultrastable frequency reference is required by many applications in time and frequency metrology, fundamental physics, particle accelerator, and astrophysics [1]–[3]
The phase error signal goes through a loop filter and controls the low-frequency voltage-controlled oscillator (VCO) phase, which is transferred to the transmitted RF signal with the SSB modulator, and the phase noise induced by the fiber link is canceled at the remote end
In summary, we demonstrated a RF dissemination system in which the phase error is directly detected instead of frequency division or multiplication processing
Summary
The transfer of ultrastable frequency reference is required by many applications in time and frequency metrology, fundamental physics, particle accelerator, and astrophysics [1]–[3]. X. Wang et al.: Enhanced Frequency Stability Over Fiber Link With Improved Phase Discrimination Scheme loop, since the reference frequency signal of the atomic clock is fixed, the two input signals of the phase detector often need to be divided or multiplied to achieve the same frequency phase discrimination.
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