|Book Details :|
- Electromagnetics and Optics.
- Optical Fiber Transmission.
- Optical Modulators and Modulation Schemes.
- Optical Receivers.
- Optical Amplifiers.
- Transmission System Design.
- Performance Analysis.
- Channel Multiplexing Techniques.
- Nonlinear Effects in Fibers.
- Digital Signal Processing.
The field of fiber-optic communications has advanced significantly over the last three decades. In the early days, most of the fiber’s usable bandwidth was significantly under-utilized as the transmission capacity was quite low and hence,
there was no need to apply techniques developed in non-optical communication systems to improve the spectral efficiency. However, with the recent revival of coherent detection, high spectral efficiency can be realized using advanced modulation formats.
This book grew out of our notes for undergraduate and graduate courses on fiber-optic communications.
Chapters 1 to 6 discuss, in depth, the physics and engineering applications of photonic and optoelectronic devices used in fiber-optic communication systems.
Chapters 7 to 11 focus on transmission system design, various propagation impairments, and how to mitigate them.
Chapters 1 to 7 are intended for undergraduate students at the senior level or for an introductory graduate course. The sections with asterisks may be omitted for undergraduate teaching or they may be covered qualitatively without the rigorous analysis provided.
Chapters 8 to 11 are intended for an advanced course on fiber-optic systems at the graduate level and also for researchers working in the field of fiber-optic communications.
Throughout the book, most of the important results are obtained by first principles rather than citing research articles.
Each chapter has many worked problems to help students understand and reinforce the concepts. Optical communication is an interdisciplinary field that combines photonic/optoelectronic devices and communication systems.
The study of photonic devices requires a background in electromagnetics. Therefore, Chapter 1 is devoted to a review of electromagnetics and optics.
The rigorous analysis of fiber modes in Chapter 2 would not be possible without understanding the Maxwell equations reviewed in Chapter 1.
Chapter 2 introduces students to optical fibers. The initial sections deal with the qualitative understanding of light propagation in fibers using ray optics theory, and in later sections an analysis of fiber modes using wave theory is carried out.
The fiber is modeled as a linear system with a transfer function, which enables students to interpret fiber chromatic dispersion and polarization mode dispersion as some kind of filter.
Two main components of an optical transmitter are the optical source, such as a laser, and the optical modulator, and these components are discussed in Chapters 3 and 4, respectively.
After introducing the basic concepts, such as spontaneous and stimulated emission, various types of semiconductor laser structures are covered in Chapter 3.
Chapter 4 deals with advanced modulation formats and different types of optical modulators that convert electrical data into optical data.
Chapter 5 deals with the reverse process – conversion of optical data into electrical data. The basic principles of photodetection are discussed.
This is followed by a detailed description of common types of photodetectors. Then, direct detection and coherent detection receivers are covered in detail.
Chapter 6 is devoted to the study of optical amplifiers. The physical principles underlying the amplifying action and the system impact of amplifier noise are covered in Chapter 6.
In Chapters 7 and 8, the photonics and optoelectronics devices discussed so far are put together to form a fiber-optic transmission system.
Performance degradations due to fiber loss, fiber dispersion, optical amplifier noise, and receiver noise are discussed in detail in Chapter 7.
Scaling laws and engineering rules for fiber-optic transmission design are also provided. Performance analysis of various modulation formats with direct detection and coherent detection is carried out in Chapter 8.
To utilize the full bandwidth of the fiber channel, typically, channels are multiplexed in time, polarization and frequency domains, which is the topic covered in Chapter 9.
So far the fiber-optic system has been treated as a linear system, but in reality it is a nonlinear system due to nonlinear effects such as the Kerr effect and Raman effect.
The origin and impact of fiber nonlinear effects are covered in detail in Chapter 10. The last chapter is devoted to the study of digital signal processing (DSP) for fiber communication systems, which has drawn significant research interest recently.
Rapid advances in DSP have greatly simplified the coherent detection receiver architecture – phase and polarization alignment can be done in the electrical domain using DSP instead of using analog optical phase-locked loop and polarization controllers.
In addition, fiber chromatic dispersion, polarization mode dispersion and even fiber nonlinear effects to some extent can be compensated for using DSP. About a decade ago, these effects were considered detrimental.
Different types of algorithm to compensate for laser phase noise, chromatic dispersion, polarization mode dispersion and fiber nonlinear impairments are discussed in this chapter.
Supplementary material including PowerPoint slides and MATLAB coding can be found by following the related websites link from the book home page at http://eu.wiley.com/WileyCDA/WileyTitle/productCd -0470518677.html.
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