Fiber optics is a transmission technique that uses electrical signals to
modulate a light source and thereby produce an optical signal
proportional to the electrical signal. These optical signals contain
information that is transmitted via a glass waveguide to a
light-sensitive receiver. Fiber optics has a distinct advantage over
copper networks for some applications. The objective of this book is to
explore monomode, as opposed to multimode, applications of fiber optics
to local area networks (LANs), which have become a rather important
aspect of this technology because of the ever-increasing growth of LANs.
Monomode fiber optics requires the use of coherent light sources such as
laser diodes, YAGs, and HeNe lasers, to name just a few. It has some
distinct advantages over multimode that this text will investigate in a
cursory manner. (The author's previous book on multimode fiber optics,
Fiber Optic Design and Applications, published by Reston, would be
helpful but not necessary to aug- ment this text.) Monomode (or
single-mode) fiber optics is the present direction of the state-
of-the-art because of its superior performance. Since a few problems
existed that limited the growth of monomode technology at the time this
book was being written, several sections of the text will be devoted to
examining the shortcom- ings as well as the performance advantages of
this technology.