Author: Sepideh T. Naimi
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The future optical switched wavelength division multiplexed (WDM) networks will require all optical wavelength conversion to avoid contention in a node when two signals on the same wavelength are being switched to the same output fiber. These future networks will also employ advanced modulation formats in order to increase the capacity of optical networks. In order to perform wavelength conversion operations on advanced modulation formats, a coherent nonlinear process, such as four-wave mixing (FWM), is required to preserve the amplitude and phase information. The phase noise transfer problem has crucial significance for the exploitation of FWM-based wavelength converters for advanced modulation formats because the phase noise transfer degrades the overall system performance. In this work, the required optical signal to noise ratio (OSNR) and laser phase noise (linewidth) limits are calculated via Monte Carlo simulations for the wavelength conversion of advanced modulation formats including DQPSK and M-QAM. Due to the sensitivity of M-QAM signals with respect to phase noise, the conversion performance is investigated using two different decision-directed phase-locked loop carrier phase recovery algorithms. In order to develop a validated numerical model for all-optical wavelength conversion of advanced modulation formats, the required OSNR versus pump linewidth at two values of bit error rate (BER) of 10-3 and 10-4 for DQPSK, 16-QAM and 64-QAM are reported for degenerate and non-degenerate FWM. With these calculations, the performance of wavelength conversion of advanced modulation formats will be guaranteed by selecting lasers with linewidths below these linewidth limits. As a next step of this work, All-optical wavelength conversion of Nyquist-WDM Superchannel using FWM in an SOA based on advanced modulation formats such as DQPSK, 16 and 64- QAM are demonstrated.
Author: Benoît Filion (Chercheur)
Publisher:
ISBN:
Category :
Languages : en
Pages : 119
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Book Description
Wavelength converters are essential building blocks of future all-optical wavelength-routed optical networks. Wavelength converters based on four-wave mixing in semiconductor optical amplifiers have been proposed since they possess many of the features required for the implementation of such networks. In the literature, they have been extensively studied in the context of direct detection optical communication systems. With the recent emergence of commercial coherent systems together with the advances in digital signal processing, there is an imperative need to study the performance of wavelength converters for advanced modulation formats. The objective of this thesis is to investigate the feasibility of wavelength converters based on four-wave mixing in semiconductor optical amplifiers for advanced modulation formats and subsequently propose a digital signal processing technique that aims to improve their performance. An experimental investigation of m-ary quadrature amplitude modulation (QAM) wavelength conversion is first performed. In particular, wideband wavelength conversion of 10 Gbaud 16-QAM and, for the first time, 5 Gbaud 64-QAM signals is successfully achieved over the whole C-band using a commercial semiconductor optical amplifier. The results show that the induced nonlinear distortions on the wavelength converted signal lead to a different optimal wavelength converter operating condition compared to wavelength conversion of intensity modulation formats. For wavelength conversion of advanced modulation formats, the tradeoff between the wavelength converted signal power and the nonlinearities dictates the optimal wavelength converters operating condition. The digital signal processing capabilities of coherent receivers renders possible the compensation of the signal impairments in the digital domain after detection. Making use of this, a digital post-compensation technique based on a small-signal analysis of the equations governing the gain dynamics of semiconductor optical amplifiers is developed in order to mitigate the nonlinear distortions imposed on the wavelength converted signal. The proof of concept is realized both via numerical simulations and experimental measurements of 10 Gbaud 16-QAM and 5 Gbaud 64-QAM: the post-compensation technique significantly improve the wavelength converter especially in the case of high-order advanced modulation formats such as 64-QAM. Finally, a thorough experimental investigation of the post-compensation technique performance for 5 Gbaud 64-QAM wavelength conversion is done. The results indicate that the signal quality is still improved even in the presence of a noisy signal at the wavelength converter input. Furthermore, it is shown that the optimal wavelength converter operating condition varies upon the amount of optical loss that follows. In a wavelength-routed optical network, the signal will likely pass through multiple wavelength conversion stages. The experimental investigation is extended to cascaded wavelength conversion stages and, for the first time, dual stage wavelength conversion of 5 Gbaud 64-QAM signal is performed. In this context, the proposed post-compensation technique still successfully improves the wavelength converter performance. The results of this thesis strongly suggest that wavelength converters based on four-wave mixing in semiconductor optical amplifiers, together with the use of digital signal processing techniques, is a promising candidate for advanced modulation formats wavelength conversion in future wavelength routed optical networks.
Author: Leif Katsuo Oxenløwe
Publisher: Elsevier Inc. Chapters
ISBN: 0128060719
Category : Technology & Engineering
Languages : en
Pages : 100
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Book Description
The serial optical data format has attracted attention for decades now, because of its promise to reduce the number of active components in a communication system. Indeed, historically increasing the serial bit rate by a factor of 4, reduced the cost per bit by 40%. Going beyond the available electronic bandwidth (roughly 100GHz today) can be obtained using optical time division multiplexing (OTDM), and symbol rates up to 1.28Tbaud per polarization have been demonstrated. As most optical signal processing devices operate on a per channel basis, it is advantageous to aggregate the data in a serial format, since this allows for optical signal processing of many bits in a single device. This chapter gives an overview of the state-of-the-art of OTDM systems to reach multi-Tbit/s serial data and means to handle these ultra-high bit rate signals using for instance nonlinear silicon waveguides for e.g. serial-to-parallel conversion.
Author: Stefan Wabnitz
Publisher: Springer
ISBN: 331914992X
Category : Science
Languages : en
Pages : 525
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Book Description
This book provides a comprehensive review of the state-of-the art of optical signal processing technologies and devices. It presents breakthrough solutions for enabling a pervasive use of optics in data communication and signal storage applications. It presents presents optical signal processing as solution to overcome the capacity crunch in communication networks. The book content ranges from the development of innovative materials and devices, such as graphene and slow light structures, to the use of nonlinear optics for secure quantum information processing and overcoming the classical Shannon limit on channel capacity and microwave signal processing. Although it holds the promise for a substantial speed improvement, today’s communication infrastructure optics remains largely confined to the signal transport layer, as it lags behind electronics as far as signal processing is concerned. This situation will change in the near future as the tremendous growth of data traffic requires energy efficient and fully transparent all-optical networks. The book is written by leaders in the field.
Author: René Bonk
Publisher: KIT Scientific Publishing
ISBN: 3866449569
Category : Technology & Engineering
Languages : en
Pages : 280
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Book Description
In this book, semiconductor optical amplifiers (SOAs) are studied with a view to linear and nonlinear applications in next-generation optical networks. Quantum-dot SOAs can be optimized for linear amplification of signals with different modulation formats and multiplexing techniques. Conversely, bulk SOAs can be easily optimized for operation in the nonlinear regime. However, due to the fast carrier recovery times in QD SOAs we also look into nonlinear applications with these devices.
Author: Peng Yu
Publisher: John Wiley & Sons
ISBN: 352734912X
Category : Technology & Engineering
Languages : en
Pages : 389
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Book Description
Helps readers understand the important advances in nanophotonics materials development and their latest applications This book introduces the current state of and emerging trends in the development of integrated nanophotonics. Written by three well-qualified authors, it systematically reviews the knowledge of integrated nanophotonics from theory to the most recent technological developments. It also covers the applications of integrated nanophotonics in essential areas such as neuromorphic computing, biosensing, and optical communications. Lastly, it brings together the latest advancements in the key principles of photonic integrated circuits, plus the recent advances in tackling the barriers in photonic integrated circuits. Sample topics included in this comprehensive resource include: Platforms for integrated nanophotonics, including lithium niobate nanophotonics, indium phosphide nanophotonics, silicon nanophotonics, and nonlinear optics for integrated photonics The devices and technologies for integrated nanophotonics in on-chip light sources, optical packaging of photonic integrated circuits, optical interconnects, and light processing devices Applications on neuromorphic computing, biosensing, LIDAR, and computing for AI and artificial neural network and deep learning Materials scientists, physicists, and physical chemists can use this book to understand the totality of cutting-edge theory, research, and applications in the field of integrated nanophotonics.
Author: Sudhakar Radhakrishnan
Publisher: BoD – Books on Demand
ISBN: 9535121901
Category : Computers
Languages : en
Pages : 200
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Book Description
This book is recommended to readers who can ponder on the collection of chapters authored/co-authored by various researchers as well as to researchers around the world covering the field of digital signal processing. This book highlights current research in the digital signal processing area such as communication engineering, image processing and power conversion system. The entire work available in the book mainly focusses on researchers who can do quality research in the area of digital signal processing and related fields. Each chapter is an independent research, which will definitely motivate young researchers to further study the subject. These six chapters divided into three sections will be an eye-opener for all those engaged in systematic research in these fields.
Author: Jason P. Jue
Publisher: Springer Science & Business Media
ISBN: 0387237607
Category : Computers
Languages : en
Pages : 161
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Book Description
Next-generation high-speed Internet backbone networks will be required to support a broad range of emerging applications which may not only require significant bandwidth, but may also have strict quality of service (QoS) requirements. Furthermore, the traffic from such applications are expected to be highly bursty in nature. For such traffic, the allocation of static fixed-bandwidth circuits may lead to the over-provisioning of bandwidth resources in order to meet QoS requirements. Optical burst switching (OBS) is a promising new technique which attempts to address the problem of efficiently allocating resources for bursty traffic. In OBS, incoming data is assembled into bursts at the edges of the network, and when the burst is ready to be sent, resources in the network are reserved only for the duration of the burst. The reservation of resources is typically made by an out-of-band one-way control message which precedes the burst by some offset time. By reserving resources only for the duration of the burst, a greater degree of utilization may be achieved in the network. This book provides an overview of optical burst switching. Design and research issues involved in the development of OBS networks are discussed, and approaches to providing QoS in OBS networks are presented. Topics include: - Optical burst switching node and network architectures - Burst assembly - Signaling protocols - Contention resolution - Burst scheduling - Quality of service in OBS networks
Author:
Publisher: Academic Press
ISBN: 0080864570
Category : Science
Languages : en
Pages : 351
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Book Description
Since its inception in 1966, the series of numbered volumes known as Semiconductors and Semimetals has distinguished itself through the careful selection of well-known authors, editors, and contributors. The "Willardson and Beer" Series, as it is widely known, has succeeded in publishing numerous landmark volumes and chapters. Not only did many of these volumes make an impact at the time of their publication, but they continue to be well-cited years after their original release. Recently, Professor Eicke R. Weber of the University of California at Berkeley joined as a co-editor of the series. Professor Weber, a well-known expert in the field of semiconductor materials, will further contribute to continuing the series' tradition of publishing timely, highly relevant, and long-impacting volumes. Some of the recent volumes, such as Hydrogen in Semiconductors, Imperfections in III/V Materials, Epitaxial Microstructures, High-Speed Heterostructure Devices, Oxygen in Silicon, and others promise that this tradition will be maintained and even expanded.Reflecting the truly interdisciplinary nature of the field that the series covers, the volumes in Semiconductors and Semimetals have been and will continue to be of great interest to physicists, chemists, materials scientists, and device engineers in modern industry.
Author: Mário Fernando Santos Ferreira
Publisher: CRC Press
ISBN: 0429557191
Category : Technology & Engineering
Languages : en
Pages : 98
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Book Description
This book provides an updated description of the most relevant types of highly nonlinear fibers. It also describes some of their actual applications for nonlinear optical signal processing. Multiple types of highly nonlinear fibers are considered, such as silica-based conventional highly nonlinear fibers, tapered fibers, photonic crystal fibers, and fibers made of highly nonlinear materials, namely lead-silicate, tellurite, bismuth oxide, and chalcogenide glasses. Several nonlinear phenomena occurring on such highly nonlinear fibers are described and used to realize different functions in the area of all-optical signal processing. Describes several nonlinear phenomena occurring on optical fibers, namely nonlinear phase modulation, parametric and stimulated scattering processes, optical solitons, and supercontinuum generation. Discusses different types of highly nonlinear fibers, namely silica-based conventional highly nonlinear fibers, tapered fibers, and photonic crystal fibers. Examines fibers made of highly nonlinear materials, namely lead-silicate, tellurite, bismuth oxide, and chalcogenide glasses. Describes the application of several nonlinear phenomena occurring on highly nonlinear fibers to realize different functions in the area of all-optical signal processing, namely optical amplification, multiwavelength sources, pulse generation, optical regeneration, wavelength conversion, and optical switching. Mário F. S. Ferreira received his PhD degree in 1992 in physics from the University of Aveiro, Portugal, where he is now a professor in the Physics Department. Between 1990 and 1991, he was at the University of Essex, UK, performing experimental work on external cavity semiconductor lasers and nonlinear optical fiber amplifiers. His research interests have been concerned with the modeling and characterization of multisection semiconductor lasers, quantum well lasers, optical fiber amplifiers and lasers, soliton propagation, nanophotonics, optical sensors, polarization, and nonlinear effects in optical fibers. He has written more than 400 scientific journal and conference publications and several books in the area of mathematical physics, optics, and photonics. He has served as chair and committee member of multiple international conferences, as well as guest editor and advisory board member of several international journals.
