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Like volume IIIA, volume IIIB consists of chapters written by different authors. Although many of the chapter authors come from Lucent and/or Bell Labs, they do a good job of keeping the book at an academic level that is largely devoid of excess or offensive commercialism. This is a first-rate book that needs to be read and understood by anyone seriously engaged in engineering activities related to optical fiber telecommunications.
Each chapter is written in what is an essentially self-contained manner (though many chapters make reference from time to time to other chapters in either of the two volumes - a welcome thing as it brings continuity to the two-volume set). After a nice overview by Kaminow, volume IIIB dives right into what is arguably the single most important optical component to be developed for telecommunications in the 90's: the erbium-doped fiber amplifier. As with most chapters, chapter 2 does not overwhelm the reader with long mathematical derivations. Instead, it places at the engineer's disposal the relevant mathematical equations necessary for important analysis, as well as a wealth of references at the end of the chapter that facilitate further reading and the most quantitative analysis. This chapter covers all the important features of amplifier design, from gain to saturation, noise figure, coupling loss, polarization effects, pumping schemes, components, and various ways in which the amplifier may be used (in-line amplifier, power amplifier, etc.).
Chapter three covers transmitter and receiver design for amplified lightwave systems. The material in this chapter is high level. Topics include things like extinction ratio, rise/fall time, chirp, mode partitioning, and polarization mode dispersion. The emphasis is on how specific attributes of the transmitter and receiver interact with other components in the transmission system to affect overall system performance. Thus, the chapter not only discusses what laser chirp is, what causes it, and how to reduce it, it also delves into the system implications of chirp and describes why it is bad, and how to determine how much you can tolerate.
Chapters four, five, and six are something of a trilogy. Chapter four introduces the idea of laser sources in general for amplified and WDM lightwave systems. Chapter 5 continues the subject by describing advances in semiconductor laser growth and fabrication technology. Chapter 6 goes into more specific detail regarding vertical-cavity surface-emitting lasers. Of these three chapters, chapter four is the most generic, and (at least for me) by far the easiest to follow. Chapter four covers subjects like direct modulation of DFB lasers, external modulation, integration of modulator and laser, making DFB lasers with discrete and stable wavelengths for WDM systems, fiber-based lasers using fiber-Bragg gratings (FBGs), tunable lasers, and a smattering on waveguide gratings and DFB array WDM sources.
While chapter 4 was easy for me to follow, I found chapters 5 and 6 rather difficult. Both these chapters are very well written, and the authors are clearly quite expert in their fields. The material, however, is sufficiently specific to the details of design that I found myself lacking much of the prerequisite information and knowledge expected by the authors. I think that chapters 5 and 6 will be of most use to people who actually work in or very closely with semiconductor laser growth technology and/or vertical-cavity surface-emitting lasers. I did come away knowing lots more about these technologies than I did going into the chapters (things like how and why lattice strain is used in the design of semiconductor lasers, for example) but a more basic introduction would have helpful to me.
Chapter 7 put me back into more familiar territory with discussions about optical fiber components and devices. Topics include fiber dispersion compensators, fiber gratings, gratings in planar waveguides, and high-power fiber lasers and amplifiers. This chapter tends to be at a high level, with little specific information or mathematical equations.
Chapter 8 is really quite interesting. The title is "Silicon Optical Bench Waveguide Technology." Like chapters 5 and 6, chapter 8 gets into more detail about specific design and manufacturability issues. Since I have more background in this area, though, I found the chapter at about the right level for me (it did not leave me feeling as lost as chapters 5 and 6 did). One of the most interesting developments in this chapter (for me, at least) was the section on Fourier filter multiplexers. The chapter also has a relatively good quantitative description (you will need to fill in some of the derivations yourself) of couplers as well as star couplers and waveguide grating routers.
Chapter 9 is a good discussion on lithium niobate integrated optics, covering issues of design as well as performance and specification. It also highlights their applications as switches, modulators, and polarization scramblers/controllers as well as wavelength filters. Chapter 10, the last chapter, reviews photonic switching technologies. There is some useful information about switching fabrics, along with generic information about important specifications.
Both volumes have a good index and extensive chapter references, making this one of the best general-purpose desk reference volumes I've found for engineers involved in lightwave communications systems.
This text is best described as an engineer's desk reference. The scope is large, necessitating breaking the book into two volumes. Volume III A deals mostly with system issues and concerns, delving into more esoteric component issues primarily to illustrate the wider network implications. Volume III B deals more with specific component design issues, such as sources, detectors, and erbium-doped fiber amplifiers (EDFAs).
As a desk reference, there are few derivations of equations from first principles. Perhaps the closest derivation is that of the nonlinear Schrodinger equation in chapter 12 on soliton transmission. Even here, however, the derivation is sketchy at best. For the most part the book simply places the equations at the reader's disposal. I found most of the equations are explained well, and most of the chapter authors included numeric examples, charts, and graphs. This helps immensely in understanding the implications of the many equations presented throughout the text. For those interested in derivations, each chapter comes with extensive endnotes so that anyone interested in reviewing the original work can easily do so.
One problem with the text revolves around definitions of mathematical variables and constants. Though they are all defined as introduced to the reader, there is no glossary of these terms. I constantly found myself writing in the books margins little notes like "alpha is the total loss coefficient, first used in equation x on page y." Since different authors write each chapter in the book, it may not be practical to have a glossary of terms for the entire volume - usage will probably overlap. Still, it would be nice had the editors suggested that each chapter have a glossary of mathematical variables. It would make the book far more practical and useful as a desk reference. On a more positive note, however, the book does contain a detailed and useful index.
Even without derivations, the book contains a plethora of equations and charts to satisfy the needs of most quantitatively oriented engineers. It's a good introductory book for those with a modest background in optical telecommunications technology. It's also a useful book for those more familiar with the technology, but needing a handy reference source with most of the pertinent information conveniently bound between two covers. Volume A contains 15 chapters in roughly 600 pages. Volume B is slightly smaller, having 10 chapters in roughly 500 pages.
For me, the two most interesting and useful sections of the book were chapter 8, "Fiber nonlinearities and their impact on transmission systems," and chapter 12, "Solitons in high bit-rate, long-distance transmissions." Chapter 12 is probably one of the best written. Although the subject matter is among the most difficult covered in the book, L. F. Mollenauer, J.P. Gordon, and P. V. Mamyshev have done a remarkable job of explaining solitions in a quantitative, accurate, yet clear and concise manner.
The first chapter in the book, a brief overview by Ivan P. Kaminow, provides some interesting historical insights and background, but has relatively little pertinent information for the design engineer. The second chapter deals at a high level with SONET and ATM technologies, explaining the requirements that led to the development of these standards and some of their topologies such as chains and self-healing rings. Chapter 3 deals with coding and error correction in optical fiber. This chapter was interesting in its use of fundamental physics (such as quantum noise) to examine the need for coding.
The next chapters move from coding and protocol to issues in the physical layer. Chapter 6 deals with polarization effects, the origin of polarization mode dispersion (PMD) and how to measure PMD. On a similar theme, chapter 7 deals with the subject of chromatic dispersion and, perhaps more importantly, the subject of dispersion compensation. One of the interesting facts about DWDM is that elimination of dispersion is no longer a design goal, as it is with single-wavelength transmission systems. In DWDM systems the designer wants just the right amount of dispersion - not too much, and not too little. There are even situations in which the dispersion map matters - in other words, you cannot always count on being able to place large bulk amounts of compensating dispersion just in front of the optical receiver. Sometimes you need to distribute it along the fiber's length.
Two chapters, 9 and 10, deal with the specific design concerns of terrestrial and undersea lightwave systems, while chapter 14 deals with the substantial concerns of analog video transmission over optical fibers. Chapter 11 deals with advances in high bit-rate transmission systems (this chapter tends to be somewhat dated, and the situation will only get worse with passing time). Chapter 13 surveys the types of fiber architectures in current and possibly future networks. Finally, Ivan P. Kaminow finishes the book with a chapter on advanced multi-access lightwave networks, which is primarily the switched DWDM network (another chapter subject to dating).
This is an extremely valuable book for anyone involved in Photonics in the telecommunications network. I highly recommend it. Whether you read it cover to cover, or simply keep it handy as a desk reference, I'm sure you will find it well worth the cover price.
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#1: short book, (you know how intimidating those tomes can be)
#2: lots of diagrams
#3: end-of-chapter questions (with answers & explanations)
If you want to understand the Kidney, no matter where you are in your studies or practice, I wholeheartedly recommend this text.
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