Investigation Of The Slow And Fast Light Effect On The Basis Of Stimulated Brillouin Scattering For Application In Optical Communication And Information Systems
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Investigation Of The Slow And Fast Light Effect On The Basis Of Stimulated Brillouin Scattering For Application In Optical Communication And Information Systems
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Author :
language : en
Publisher:
Release Date : 2008
Investigation Of The Slow And Fast Light Effect On The Basis Of Stimulated Brillouin Scattering For Application In Optical Communication And Information Systems written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
In today's information age demand for ultra-fast information transfer with ultra-high bandwidths has reached extraordinary levels. Hence, the transmission in the future internet-backbone will be increasingly constrained in the network nodes. At the same time, the power consumption of the network systems will increase to unsustainable levels. To overcome these constraints power-ecient photonic networks which provide ultra-fast all-optical switching and routing are essential. Nowadays, optical signal processing and switching can be implemented relatively easily. However, the realization of optical bu ers and short-term memories is still an unsolved challenge. The slow- and fast-light e ect has been investigated as one solution for the optical bu ering over the last few years. It means the slowing down and acceleration of the group velocity of light pulses in a medium. To realize this, many di erent methods and material systems have been developed but due to its signi cant advantages the nonlinear e ect of stimulated Brillouin scattering (SBS) is particularly promising. However, it also su ers from disadvantages which limit the slow- and fast-light performance. In this thesis the slow- and fast-light e ect using SBS is investigated. SBS-based slow- and fast-light utilizes the generation of arti cial resonances by the coupling of a strong pump wave inside an optical ber. This creates gain and loss regions in which a counterpropagating signal wave can be ampli ed and attenuated, but slowed down and accelerated as well. The properties of such a system depend directly on the Brillouin spectrum. Thus, the focus of this work is the analysis of opportunities to overcome the natural limits of SBS-based slow-light by the optimization of the transfer function. Therefore, di fferent novel methods for a bandwidth enhancement, an enhancement of the maximum achievable time delay and a reduction of the output pulse distortions are investigated in theory and experiment. This includes.
Integrated Micro Ring Photonics
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Author : Iraj Sadegh Amiri
language : en
Publisher: CRC Press
Release Date : 2016-12-08
Integrated Micro Ring Photonics written by Iraj Sadegh Amiri and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-12-08 with Computers categories.
Micro-ring resonators (MRRs) are employed to generate signals used for optical communication applications, where they can be integrated in a single system. These structures are ideal candidates for very large-scale integrated (VLSI) photonic circuits, since they provide a wide range of optical signal processing functions while being ultra-compact. Soliton pulses have sufficient stability for preservation of their shape and velocity. Technological progress in fields such as tunable narrow band laser systems, multiple transmission, and MRR systems constitute a base for the development of new transmission techniques. Controlling the speed of a light signal has many potential applications in fiber optic communication and quantum computing. The slow light effect has many important applications and is a key technology for all optical networks such as optical signal processing. Generation of slow light in MRRs is based on the nonlinear optical fibers. Slow light can be generated within the micro-ring devices, which will be able to be used with the mobile telephone. Therefore, the message can be kept encrypted via quantum cryptography. Thus perfect security in a mobile telephone network is plausible. This research study involves both numerical experiments and theoretical work based on MRRs for secured communication.
Photonic Technologies To Enable Slow Light Applications
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Author : Joseph E. Vornehm
language : en
Publisher:
Release Date : 2014
Photonic Technologies To Enable Slow Light Applications written by Joseph E. Vornehm and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
"Slow light is light that travels at unusual, extreme group velocities - sometimes as slow as walking speed or slower. Light waves can be described by many velocities, but for a narrow-band pulse of light (a carrier frequency modulated by an envelope), the group velocity is the speed of the pulse envelope. The term slow light also encompasses other exotic group velocities due to similar techniques, including fast light, stopped light, and backwards light. The science of slow light has been established over the past several years, and research attention is now turning to potential applications of slow light. One application of slow light is as an all-optical true-time delay. Two slow light methods in optical fibers, stimulated Brillouin scattering (SBS) and dispersive delay, are used to provide a controllable pulse delay in a prototype slow-light phased-array laser radar, called SLIDAR. These slow light methods compensate the group delay mismatch of pulses of 6 ns duration while the phased array is steered in two dimensions. A phase control system is described that maintains phase lock among three signal channels and a reference channel, each containing 2:2 km of optical fiber, while accommodating the demands of the slow light techniques. Residual phase error is kept below [pi]/5 radians (1/10 wave) RMS. Slow light can also enhance the spectral sensitivity of spectrometers and interferometers. A design for a slow-light-enhanced nanophotonic spectrometer is presented. One important use of spectrometers is to detect specific chemicals, and I describe an approach to multivariate optical computation, which can be used for automatic chemical spectrum recognition. This technique, which could one day be implemented with a slow-light-enhanced spectrometer as a single-chip chemical detection platform, is explored experimentally in the visible spectrum using a spatial light modulator"--Pages viii-ix.
Studies Of Slow Light With Applications In Optical Beam Steering
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Author : Aaron Schweinsberg
language : en
Publisher:
Release Date : 2012
Studies Of Slow Light With Applications In Optical Beam Steering written by Aaron Schweinsberg and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
"This thesis presents a variety of work on the topic of slow light. It contains research that surveys the many different physical systems capable of producing slow light, and culminates in a project that demonstrates a novel application of slow light related to all-optical phased-array beam steering. It is first shown that high-bandwidth pulses can be substantially delayed with minimal absorption and broadening when transmitted through a cesium vapor cell and tuned between the Cs D2 hyperfine resonances. Next, possibilities for the production of slow light in fiber resonator structures are explored. The delay of a pulse on transmission through a low-finesse fiber ring is measured, and coupled-resonator-induced transparency, a phenomenon analogous to the electromagnetically-induced transparency that is commonly used to create slow light, is demonstrated in a fiber-based coupled-resonator structure. It is then shown that slow light can be created using stimulated Brillouin scattering in an optical fiber, and how specific control of the pump beam's intensity and frequency spectrum can enable slowing of high bandwidth pulses as well as pulse delays and advancements that are tunable over a wide range. A series of experiments that explore the phenomenon of pulse delays and advancements using saturable media are then presented, including work with Erbium-doped fiber and PbS quantum dots. Finally, it is shown how slow light can be applied to the problem of temporal pulse mismatch in a pulsed, scanning, multi-aperture laser radar"--Leaf vii.
Study Of White Light Cavity Effect Via Stimulated Brillouin Scattering Induced Fast Light In A Fiber Ring Resonator
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Author : Ho Nam Yum
language : en
Publisher:
Release Date : 2010
Study Of White Light Cavity Effect Via Stimulated Brillouin Scattering Induced Fast Light In A Fiber Ring Resonator written by Ho Nam Yum and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Techniques to control dispersion in a medium have attracted much attention due to potential applications to devices such as ring laser gyroscopes, interferometric gravitational wave detectors, data buffers, phased array radars and quantum information processors. Of particular interest is an optical resonator containing a medium with an anomalous dispersion corresponding to fast-light, which behaves as a White Light Cavity (WLC). A WLC can be tailored to improve the sensitivity of sensing devices as well as to realize an optical data buffering system that overcomes the delay-bandwidth product of a conventional cavity. This dissertation describes techniques to tailor the dispersion for fast-light in intracavity media. We present first a demonstration of fast-light in a photorefractive crystal. When placed inside a cavity, such a medium could be used to enhance the bandwidth of a gravitational wave detector. We then describe how a superluminal laser can be realized by adding anomalously dispersive medium inside a ring laser. We identify theoretical conditions under which the sensitivity of the resonance frequency to a change in the cavity length is enhanced by as much as seven orders of magnitude. This paves the way for realizing a fast-light enhanced ring laser gyroscope, for example. This is followed by the development of a novel data buffering system which employs two WLC systems in series. In this system, a data pulse can be delayed an arbitrary amount of time, without significant distortion. The delay time is independent of the data bandwidth, and is limited only by the attenuation experienced by the data pulse as it bounces between two high-reflectivity mirrors. Such a device would represent a significant breakthrough in overcoming the delay-time bandwidth product limitation inherent in conventional data buffers. We then describe our experimental effort to create a fiber-based WLC by using stimulated Brillouin scattering (SBS). Experimental results, in agreement with our theoretical model presented here, show that the WLC effect is small under the conditions supported by current fiber optic technology. We conclude that future efforts to induce a large WLC effect would require fibers with high Brillouin coefficient and low transmission loss, as well as optical elements with very low insertion loss and high power damage thresholds.
Optics Letters
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Author :
language : en
Publisher:
Release Date : 2008
Optics Letters written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Optics categories.
Advances In Optical Fiber Technology
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Author : Moh Yasin
language : en
Publisher: BoD – Books on Demand
Release Date : 2015-02-25
Advances In Optical Fiber Technology written by Moh Yasin and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-02-25 with Technology & Engineering categories.
This book is a compilation of works presenting recent developments and practical applications in optical fiber technology. It contains 13 chapters from various institutions that represent global research in various topics such as scattering, dispersion, polarization interference, fuse phenomena and optical manipulation, optical fiber laser and sensor applications, passive optical network (PON) and plastic optical fiber (POF) technology. It provides the reader with a broad overview and sampling of the innovative research on optical fiber technologies.
Stochastic And Deterministic Fluctuations In Stimulated Brillouin Scattering
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Author : Alexander Luis Gaeta
language : en
Publisher:
Release Date : 1990
Stochastic And Deterministic Fluctuations In Stimulated Brillouin Scattering written by Alexander Luis Gaeta and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.
The dynamical behavior of stimulated Brillouin scattering (SBS) under a variety of conditions is investigated both theoretically and experimentally. Under conditions of a single continuous-wave laser field, the initiation of the SBS process is treated by including the thermal fluctuations of the material density which lead to spontaneous Brillouin scattering. Predictions are made for the threshold of the Stokes light. The spectrum of the output Stokes light is predicted to exhibit gain-narrowing as the input laser intensity is increased. Under certain conditions, the Stokes output intensity is expected to exhibit nearly 100% fluctuations even far above the threshold for SBS. Experiments performed in a single-mode optical fiber verify many of the predictions of the theory. Stimulated Brillouin scattering in the presence of two counterpropagating laser beams is studied. Under these conditions, the laser beams become temporally unstable to the growth of Stokes and anti-Stokes light. For the case when the input intensities of the two waves are comparable, the threshold for instability can be significantly lower than he threshold for usual single-beam SBS and, for the case of a broad Brillouin line, the system can show a period-doubling route to chaos. This Brillouin instability was observed experimentally using carbon disulfide as the Brillouin-active material.
Electrical Electronics Abstracts
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Author :
language : en
Publisher:
Release Date : 1997
Electrical Electronics Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Electrical engineering categories.
Recent Progress In Optical Fiber Research
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Author : Moh Yasin
language : en
Publisher: BoD – Books on Demand
Release Date : 2012-01-25
Recent Progress In Optical Fiber Research written by Moh Yasin and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-01-25 with Technology & Engineering categories.
This book presents a comprehensive account of the recent progress in optical fiber research. It consists of four sections with 20 chapters covering the topics of nonlinear and polarisation effects in optical fibers, photonic crystal fibers and new applications for optical fibers. Section 1 reviews nonlinear effects in optical fibers in terms of theoretical analysis, experiments and applications. Section 2 presents polarization mode dispersion, chromatic dispersion and polarization dependent losses in optical fibers, fiber birefringence effects and spun fibers. Section 3 and 4 cover the topics of photonic crystal fibers and a new trend of optical fiber applications. Edited by three scientists with wide knowledge and experience in the field of fiber optics and photonics, the book brings together leading academics and practitioners in a comprehensive and incisive treatment of the subject. This is an essential point of reference for researchers working and teaching in optical fiber technologies, and for industrial users who need to be aware of current developments in optical fiber research areas.