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We present an experimental study on two key elements to design a low phase noise coupled optoelectronic oscillator (COEO). Fiber lengths and dispersions are investigated to highlight the differences between the optical and optoelectronic loops. After optimization, a 10 GHz COEO at 1.5 μm with a total of 590 m of fiber exhibits phase noise levels of −125 dBc/Hz at 1 kHz and −140 dBc/Hz at 10 kHz.
We present our recent results on a 10 GHz coupled optoelectronic oscillator (COEO). With a total of 550 m of fiber, the COEO exhibits phase noise level of −140 dBc/Hz at 10 kHz and −137 dBc/Hz for the first spur.
We present a direct measurement of the intracavity dispersion of a coupled optoelectronic oscillator (COEO). The measurement can be performed while the COEO is oscillating, taking into account the dispersion of the modulator and the saturated active medium, without any other component than the ones composing the oscillator. It eases the dispersion management before the detection stage for minimal...
We present two dual loop optoelectronic oscillators using short fibers (1 km range). Fiber lengths are optimized using a simple model which predicts both configurations ultra-low phase noise results, improving either the close-to-carrier phase noise, or the spur level.
Contrast and finesse of a 19-cell hollow-core photonic bandgap fiber resonator are experimentally investigated. The results show compatibility with medium to high performance rotation sensing applications, while minimizing the Kerr effect.
The gas Ring Laser Gyroscope is an excellent inertial rotation sensor. Nevertheless, its accuracy at low angular velocities is limited by the (very small) imperfections of the mirrors forming its optical cavity. In this paper, we propose to compensate the effect of these imperfections thanks to an online estimation of the system parameters. The estimator is designed on a suitable simplification of...
We present a 10 GHz dual loop optoelectronic oscillator (OEO), with very low phase noise (−144.7 dBc/Hz at 10 kHz) and low spur level (−145 dBc/Hz), despite using short fibers (1 km/100 m). The OEO is designed thanks to a simple model, which shows good agreement both with single and dual loop configurations.
Dual-frequency solid-state lasers are attractive for a large number of applications such as microwave photonics, spectroscopy, and metrology. As far as dual-frequency lasers are considered, the intensity noise spectrum of each eigenmode exhibits two peaks lying at the well-known in-phase and anti-phase eigen-frequencies of two coupled oscillators. The in-phase noise, which corresponds to the standard...
Strong anti-phase intensity noise reduction is experimentally and theoretically shown for dual-frequency Nd:YAG lasers. This phenomenon is obtained by aligning the two orthogonally polarized modes along the crystallographic axes of a (100)-cut Nd:YAG crystal.
We have experimentally and theoretically explored the degree of correlation of intensity noises of two orthogonally polarized modes in a dual frequency VECSEL for different values of coupling by changing spatial separation between the modes.
We report the experimental observation of an ultranarrow resonance, as narrow as EIT ones, due to the transfer of coherent population oscillations to the lower states of a Λ-system.
We investigate the decay time of a cavity containing strong dispersion achieved through electromagnetically induced transparency (EIT) in 4He*. We show that this concept is no longer relevant in the case of strong negative dispersion.
We present a technique allowing us to optimize the output coupling of the resonant wave of a singly resonant optical parametric oscillator (SRO). By inserting a silica plate inside the cavity and tilting it around the Brewster angle, the output coupling of the SRO can be easily varied. This technique combines in principle the advantage of an efficient output coupling together with the possibility...
Electromagnetically induced transparency (EIT) in a three-level Λ-system is a phenomenon leading to high dispersion and thus significant changes in the group velocity inside a medium. Some authors have proposed introduction of such highly dispersive medium into a cavity in order to reduce its linewidth, or enhance the sensitivity of an interferometer. These proposals are usually made considering that...
Coherent population oscillations (CPO), an ubiquitous mechanism inducing slow and fast light (SFL), is present in any active medium provided that a strong optical beam saturates this medium. Thus, CPO must be present in any single frequency laser since the oscillating beam acts as a strong pump which saturates the active medium. This effect could be observed using an external probe whose angular frequency...
Quantum manipulation using the optical transition (3H4→1D2) of Pr3+ embedded in solid state host materials requires a visible source emitting at 606 nm with a linewidth at the kHz level [1]. In a previous work, we have reported the stabilization of a continuous wave intracavity frequency doubled singly resonant optical parametric oscillator (cw-SHG-SRO) by locking it onto the side of the transmission...
The role of coherent population oscillations is evidenced in the noise spectrum of an ultra-low noise laser. The coherent population oscillations manifest themselves through their associated dispersion probed by the non-lasing side modes.
We investigate the decay time of a cavity containing strong dispersion achieved through EIT in 4He∗ with linear polarizations. The photon lifetime is shown to be governed by the group velocity of light.
We show that forced coherent population oscillations (CPO) constitute an alternative set-up to conceive a controllable RF phase shifter, and that wave-mixing in SOAs opens the possibility to conceive optical tunable delay lines beyond the carrier lifetime limit.
We present an experimental and numerical investigation of the influence of filtering the red-shifted modulation on the linearity of a microwave-photonics link with a CPO-based phase shifter. Different behavior versus SOA bias current are evidenced.
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