753 research outputs found
Optoelectronic Oscillators
Patrice Salzenstein (2011). Optoelectronic Oscillators, Optoelectronic Devices and Properties, Oleg Sergiyenko (Ed.), ISBN: 978-953-307-204-3, InTech, Available from: http://www.intechopen.com/articles/show/title/optoelectronic-oscillatorsOptoelectronic devices impact many areas of society, from simple household appliances and multimedia systems to communications, computing, spatial scanning, optical monitoring, 3D measurements and medical instruments. This is the most complete book about optoelectromechanic systems and semiconductor optoelectronic devices; it provides an accessible, well-organized overview of optoelectronic devices and properties that emphasizes basic principles
Complex Dynamics and Synchronization of Delayed-Feedback Nonlinear Oscillators
We describe a flexible and modular delayed-feedback nonlinear oscillator that
is capable of generating a wide range of dynamical behaviours, from periodic
oscillations to high-dimensional chaos. The oscillator uses electrooptic
modulation and fibre-optic transmission, with feedback and filtering
implemented through real-time digital-signal processing. We consider two such
oscillators that are coupled to one another, and we identify the conditions
under which they will synchronize. By examining the rates of divergence or
convergence between two coupled oscillators, we quantify the maximum Lyapunov
exponents or transverse Lyapunov exponents of the system, and we present an
experimental method to determine these rates that does not require a
mathematical model of the system. Finally, we demonstrate a new adaptive
control method that keeps two oscillators synchronized even when the coupling
between them is changing unpredictably.Comment: 24 pages, 13 figures. To appear in Phil. Trans. R. Soc. A (special
theme issue to accompany 2009 International Workshop on Delayed Complex
Systems
Harnessing optical micro-combs for microwave photonics
In the past decade, optical frequency combs generated by high-Q
micro-resonators, or micro-combs, which feature compact device footprints, high
energy efficiency, and high-repetition-rates in broad optical bandwidths, have
led to a revolution in a wide range of fields including metrology, mode-locked
lasers, telecommunications, RF photonics, spectroscopy, sensing, and quantum
optics. Among these, an application that has attracted great interest is the
use of micro-combs for RF photonics, where they offer enhanced functionalities
as well as reduced size and power consumption over other approaches. This
article reviews the recent advances in this emerging field. We provide an
overview of the main achievements that have been obtained to date, and
highlight the strong potential of micro-combs for RF photonics applications. We
also discuss some of the open challenges and limitations that need to be met
for practical applications.Comment: 32 Pages, 13 Figures, 172 Reference
Emerging applications of integrated optical microcombs for analogue RF and microwave photonic signal processing
We review new applications of integrated microcombs in RF and microwave
photonic systems. We demonstrate a wide range of powerful functions including a
photonic intensity high order and fractional differentiators, optical true time
delays, advanced filters, RF channelizer and other functions, based on a Kerr
optical comb generated by a compact integrated microring resonator, or
microcomb. The microcomb is CMOS compatible and contains a large number of comb
lines, which can serve as a high performance multiwavelength source for the
transversal filter, thus greatly reduce the cost, size, and complexity of the
system. The operation principle of these functions is theoretically analyzed,
and experimental demonstrations are presented.Comment: 16 pages, 8 figures, 136 References. Photonics West 2018 invited
paper, expanded version. arXiv admin note: substantial text overlap with
arXiv:1710.00678, arXiv:1710.0861
Optoelectronic oscillator with low temperature induced frequency drift
We demonstrate a hollow-core photonic bandgap fiber delay-line based 10 GHz Optoelectronic oscillator (OEO) with over 6 times less temperature induced frequency drift compared to a standard single mode fiber delay-line based OEO
Microwave Signal Processing over Multicore Fiber
[EN] We review the introduction of the space dimension into fiber-based technologies to
implement compact and versatile signal processing solutions for microwave and millimeter wave
signals. Built upon multicore fiber links and devices, this approach allows the realization of
fiber-distributed signal processing in the context of fiber-wireless communications, providing both
radiofrequency access distribution and signal processing in the same fiber medium. We present
different space-division multiplexing architectures to implement tunable true time delay lines that
can be applied to a variety of microwave photonics functionalities, such as signal filtering, radio
beamsteering in phased array antennas or optoelectronic oscillation. In particular, this paper gathers
our latest work on the following multicore fiber technologies: dispersion-engineered heterogeneous
multicore fiber links for distributed tunable true time delay line operation; multicavity devices built
upon the selective inscription of gratings in homogenous multicore fibers for compact true time delay
line operation; and multicavity optoelectronic oscillation over both homogeneous and heterogeneous
multicore fibers.This research was supported by the ERC Consolidator Grant 724663; the Spanish Projects TEC2015-62520-ERC, TEC2014-60378-C2-1-R and TEC2016-80150-R; the Valencian Research Excellency Award Program GVA PROMETEO 2013/012; the Spanish MECD FPU Scholarship (FPU13/04675) for J. Hervás; the Spanish scholarships MINECO BES-2015-073359 for S. GarcĂa; and the Spanish MINECO Ramon y Cajal program RYC-2014-16247 for I. Gasulla.GarcĂa Cortijo, S.; Barrera Vilar, D.; Hervás-Peralta, J.; Sales Maicas, S.; Gasulla Mestre, I. (2017). Microwave Signal Processing over Multicore Fiber. Photonics. 4(49):1-14. https://doi.org/10.3390/photonics404004911444
Simulation of optoelectronic oscillator injection locking, pulling and spiking phenomena
Complex envelope and reduced phase simulation models describing the dynamical
behavior of an optoelectronic oscillator (OEO) under injection by an external
source are described. The models are built on the foundations of a previously
reported delay integral differential equation (DDE) theory of injection locking
of time delay oscillators (TDO) such as the OEO. The DDE formulation is
particularly amenable to high precision simulation using the Simulink block
diagram environment. The correspondence between the blocks and the oscillator
components offers intuition and considerable freedom to explore different
circuit architectures and design variations with minimal coding effort. The
simulations facilitate the study of the profound effect the multimode nature of
a TDO has on its dynamical behavior. The reduced phase models that make use of
the Leeson approximation are generally successful in reproducing the results of
complex envelope models for established oscillations except for spiking
phenomena for which the Leeson approximation fails. Simulation results
demonstrating phenomena not captured by classical injection theory are
presented, including multimode oscillation, the appearance of sidemodes in the
RF and phase noise spectrum, and persistent spike trains redolent of recent
experimental observations of 2pi phase pulse trains in a broadband OEO under
injection
Optoelectronic mixer with a photoconductive switch for 1550 nm wavelengths
We demonstrate an optoelectronic mixer based on an ultrafast InGaAs photoconductive switch and its use in an innovative heterodyne detection system for Radio over Fibre transmission. The advantage of the proposed switch is its relatively flat response curve in a wide frequency range up to 67 GHz. Two mixing schemes are presented through I-Q modulated data-stream down-conversion. The data can modulate either the electrical signal or the optical signal. In case the electrical signal is modulated, a mode-locked semiconductor laser diode is used as an optical local oscillator at the self-oscillating frequency of 24.5 GHz. The InP based quantum-dash mode-locked laser emitting in the 1570 nm wavelength range is stabilized by a feedback loop and shows a low phase noise in order to increase the mixing performances of the detection apparatus. In a second experiment, the photoconductive switch is combined with a continuous wave laser to demonstrate the feasibility of down converting an optically provided data-stream with an electrical local oscillator
Optical frequency comb technology for ultra-broadband radio-frequency photonics
The outstanding phase-noise performance of optical frequency combs has led to
a revolution in optical synthesis and metrology, covering a myriad of
applications, from molecular spectroscopy to laser ranging and optical
communications. However, the ideal characteristics of an optical frequency comb
are application dependent. In this review, the different techniques for the
generation and processing of high-repetition-rate (>10 GHz) optical frequency
combs with technologies compatible with optical communication equipment are
covered. Particular emphasis is put on the benefits and prospects of this
technology in the general field of radio-frequency photonics, including
applications in high-performance microwave photonic filtering, ultra-broadband
coherent communications, and radio-frequency arbitrary waveform generation.Comment: to appear in Laser and Photonics Review
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