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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...
The broad bandwidth and low loss-per-unit-length of photonic links make them potentially useful for the transmission of low-noise and high-frequency analog microwave signals. Such microwave-photonic links are useful in several precision radio-frequency (RF) applications including: radar antenna remoting, synchronization of distributed RF systems, and time/frequency transfer for geo-location. However,...
The optoelectronic oscillator (OEO) is a radio-frequency (RF) source that utilizes lengths of optical fiber in a ring resonator to create low-phase-noise signals. In this work, we demonstrate a novel fiber-optic acoustic sensor by measuring the modulation sidebands induced on the OEO's RF signal by an acoustic tone impinging on the fiber spool in the OEO. The narrow linewidth and high oscillating...
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...
Optical fiber induced noise limits the noise performance of several radio frequency (RF) over fiber links. In this work, we characterize the effects of Rayleigh scattering on the intensity and phase noise of RF signals transmitted via optical fibers. In addition, we investigate laser frequency modulation as a means of suppressing Rayleigh-induced RF intensity and phase noise. We find the optimal frequency...
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...
Optical fiber-length-dependent flicker phase noise has been identified as a major limit to the reduction of phase noise in optoelectronic oscillators (OEOs). We demonstrate that in our system the largest contributor to low-frequency flicker noise is from Rayleigh scattering through the fiber combined with amplitude-to-phase conversion in the RF amplifiers.
Analog radio frequency (RF) over fiber link systems have shown promise in aviation applications for RF Radar signal distribution within aircraft. These RF-photonic links usually requires relatively high optical power (0.1 to 1W) for the laser carrier in order to increase the spur-free-dynamic-range (SFDR) and reduce the noise figure of the link system. However, these high power levels lead to nonlinear...
Optical fiber-length-dependent flicker phase noise has been identified as a major limit to the reduction of phase noise in opto-electronic oscillators (OEOs). We outline a systematic approach to model the optical path of the OEO, and investigate the sources of length-dependent phase noise in the optical path and how they are effected by the dispersion and Kerr nonlinearity of the optical fiber.
We discuss possible sources for the experimentally-observed length-dependent phase noise in opto-electronic oscillators. We eliminate several possibilities and show that conversion of laser amplitude noise to phase noise is a likely candidate.
Optoelectronic oscillators are a promising source of spectrally pure, easily tunable microwave signals. These oscillators use a low-loss fiber optic delay line as a very high Q resonant cavity. However, length-dependent sources of phase noise prevent the full Q of the resonant cavity from being realized. Here we show evidence that this length-dependent phase noise is in part dependent upon the optical...
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