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文件名称:fiber-optic communication
文件大小:4.15MB
文件格式:PDF
更新时间:2012-11-18 15:00:43
optic communication
A communication system transmits information from one place to another, whether
separated by a few kilometers or by transoceanic distances. Information is often carried
by an electromagnetic carrier wave whose frequency can vary from a few megahertz
to several hundred terahertz. Optical communication systems use high carrier
frequencies (∼100 THz) in the visible or near-infrared region of the electromagnetic
spectrum. They are sometimes called lightwave systems to distinguish them from microwave
systems, whose carrier frequency is typically smaller by five orders of magnitude
(∼1 GHz). Fiber-optic communication systems are lightwave systems that employ
optical fibers for information transmission. Such systems have been deployed
worldwide since 1980 and have indeed revolutionized the technology behind telecommunications.
Indeed, the lightwave technology, together with microelectronics, is believed
to be a major factor in the advent of the “information age.” The objective of
this book is to describe fiber-optic communication systems in a comprehensive manner.
The emphasis is on the fundamental aspects, but the engineering issues are also
discussed. The purpose of this introductory chapter is to present the basic concepts and
to provide the background material. Section 1.1 gives a historical perspective on the
development of optical communication systems. In Section 1.2 we cover concepts such
as analog and digital signals, channel multiplexing, and modulation formats. Relative
merits of guided and unguided optical communication systems are discussed in Section
1.3. The last section focuses on the building blocks of a fiber-optic communication
system.
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- 是2002年出的第三版