This book covers the recent progress in fiber-optic communication systems with a main focus on the impact of fiber nonlinearities on the system performance. Over the past few years, there has been significant progress in coherent communication systems mainly because of the advances in digital signal processing techniques. This has led to renewed interest in fiber linear and nonlinear impairments and techniques to mitigate them in electrical domain. In this book, the reader will find all the important topics of fiber optic communication systems in one place with in-depth coverage by the experts of each subtopics. Pioneers from each of the sub-topics have been invited to contribute. Each chapter will have a section on fundamentals, review of literature survey and the recent developments. The reader will benefit from this approach since many of the conference proceedings and journal articles mainly focus on the authors’ research work without spending space on preliminaries.

Nowadays, dynamic traffic demands — including high-definition video streaming requested by mobile devices and large bulks of data transfers taking place between data centers — continue to increase in volume over time. The present networks are struggling to meet the dramatic data rate increase over the next decade. Optical networks form the backbone of modern communication systems and are evolving to be able to offer transmission rates as high as 1~Tbps per channel (wavelength). Since the usable optical spectrum is limited, how to increase the bandwidth efficiency to accommodate all the requests while considering the transmission impairments that degrade the optical signal quality is also a big challenge. With network traffic being more dynamic, one important issue is the signal quality fluctuation over the time when other optical circuits (lightpaths) are set up and torn down. The quality of transmission (QoT) must be satisfied and ensured during the entire lifetime of any lightpath. Physical layer models are used to evaluate the signal quality. These models need to be efficient in order to estimate the QoT in real time, considering the current network status. In this dissertation, several models for estimating the physical layer impairments (PLIs) and the signal quality with the feasibility to deal with dynamic traffic are analyzed. Network layer solutions and algorithms are proposed to improve the QoT. Three models and their applications are studied: 1) legacy models with non-coherent detection in extended Generalized Multi-Protocol Label Switching (GMPLS) based WDM networks, in which race conditions from both normal traffic and restoration requests when fiber link failures happen are analyzed and efficiently used to improve the acceptance rate; 2) a modeling framework to estimate signal power and channel optical signal-to-noise ratio (OSNR) accounting for realistic characterization, i.e., uneven gain and noise figure, of optical amplifiers is introduced and its accuracy and efficiency in both line networks and meshed networks are analyzed; 3) Gaussian Noise (GN) model in transmission systems with coherent detection and its application with spectrum assignment constraints to improve channel OSNR in GMPLS based networks are studied. With the above models, network operators would be able to accurately estimate the signal power and channel OSNR to ensure the QoT of all the channels is well maintained within the receiver's sensitivity region. Moreover, the improved acceptance rate and signal quality can significantly increase the network throughput and bandwidth efficiency.

This book covers the recent progress in fiber-optic communication systems with a main focus on the impact of fiber nonlinearities on the system performance. Over the past few years, there has been significant progress in coherent communication systems mainly because of the advances in digital signal processing techniques. This has led to renewed interest in fiber linear and nonlinear impairments and techniques to mitigate them in electrical domain. In this book, the reader will find all the important topics of fiber optic communication systems in one place with in-depth coverage by the experts of each subtopics. Pioneers from each of the sub-topics have been invited to contribute. Each chapter will have a section on fundamentals, review of literature survey and the recent developments. The reader will benefit from this approach since many of the conference proceedings and journal articles mainly focus on the authors’ research work without spending space on preliminaries.

This book is a collection of works dealing with the important technologies and mathematical concepts behind today's optical fiber communications and devices. It features 17 selected topics such as architecture and topologies of optical networks, secure optical communication, PONs, LANs, and WANs and thus provides an overall view of current research trends and technology on these topics. The book compiles worldwide contributions from many prominent universities and research centers, bringing together leading academics and scientists in the field of photonics and optical communications. This compendium is an invaluable reference edited by three scientists with a wide knowledge of the field and the community. Researchers and practitioners working in photonics and optical communications will find this book a valuable resource.

Volume B is devoted to light wave systems and system impairments and compensation. Some of the topics include growth of the Internet, network architecture, undersea systems, high speed TDM transmission, cable TV systems, access networks, simulation tools, nonlinear effects, polarization mode dispersion, bandwidth formats, and more. This book is an excellent companion to Optical Fiber Telecommunications IVA: Components (March 2002, ISBN: 0-12-395172-0). Fourth in a respected and comprehensive series - Authoritative authors from a range of organizations - Suitable for active lightwave R&D designers, developers, purchasers, operators, students, and analysts - Lightwave components reviewed in Volume A - Lightwave systems and impairments reviewed in Volume B - Up-to-the minute coverage