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We stabilized the repetition rate of an optical frequency comb with a self-referenced phase-locked loop that used a short-path-length fiber-optic interferometer to generate its error signal. In this work, we used a homodyne interferometer instead of a heterodyne interferometer, so that the architecture of the phase-locked loop was simpler than our previous implementation. We used the stabilized repetition...
We stabilized the repetition rate of a mode-locked laser (MLL) to a fiber-optic delay-line in order to generate a low-phase-noise microwave signal at 10 GHz. We designed a circuit to directly cancel the contribution of the MLL's carrier-envelope-offset (CEO-) noise to the stabilization feedback signal. The sensitivity of our feedback method is enhanced by the ratio of the optical frequency to the...
We demonstrate that double-Rayleigh-scattering-induced optical-intensity noise in separate fibers is only partially correlated. Hence, double-Rayleigh-scattering contributes to the uncorrelated fiber-induced noise that limits the performance of active feedback cancellation in two-way unidirectional RF-photonic links.
Current schemes for the photonic transfer of radio frequencies rely on bidirectional active feedback in which the optical signal must propagate in both directions through a single optical fiber. This requirement is not readily compatible with existing optical fiber networks; hence, it is important to develop alternate means of suppressing optical-fiber-induced noise. Previously, we experimentally...
Guided entropy mode Rayleigh scattering in optical fibers has been shown to have detrimental effects in optical fiber links for radio frequency transfer, optoelectronic oscillators (OEOs), and broadband analog optical fiber links. We have previously shown that GEMRS-induced noise can be suppressed via sinusoidal dithering of the laser drive current. Previously, we had hypothesized that this suppression...
External vibrations induce phase noise in low noise oscillators such as the OEO (opto-electronic oscillator). The g-sensitivity quantifies the efficiency of this process. In fiber-based OEOs, vibrations of the fiber spool dominate the generation of phase noise. In this case, we observe decreasing g-sensitivity with increasing Q-factor (i.e., fiber length). This result indicates the interplay of two...
Optoelectronic oscillators (OEOs) are hybrid RF-photonic oscillators that promise to be environmentally robust frequency sources with very low phase noise. Recent experiments have shown that the excess flicker phase noise in these systems grows with the length of the optical fiber loop. In this paper, we detail a mechanism for this length-dependent flicker noise in which Rayleigh-scattering-induced...
Stimulated Brillouin scattering (SBS) degrades the performance of ultra-low phase noise RF-photonic links by limiting the optical power that can be transmitted through the optical fiber. While SBS can be suppressed with a variety of methods, existing techniques conflict with the demands of RF-photonic links that require the lowest phase noise. In this work, we present a new technique that is compatible...
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