Single-mode fibers are the most advanced means of transmitting
information, since they provide extremely low attenuation and very high
bandwidths. At present, long distance communication by single-mode
fibers is cheaper than by conventional copper cables, and in the future
single-mode fibers will also be used in the subscriber loop. Since
single-mode fibers have many applications, a variety of people need to
understand this modern transmission medium. How- ever, waveguiding in
single-mode fibers is much more difficult to understand than waveguiding
in copper lines. A single-mode fiber is a dielectric waveguide operated
at optical wave- lengths. Since 1961, I have been involved in
experimental and theoretical re- search on dielectric rod waveguides in
the microwave region. From the experi- ments, I learned much about the
properties of a wave guided by a dielectric rod or a glass fiber,
especially about its behavior at waveguide discontinuities like bends,
gaps, or the waveguide end. Since 1972, my co-workers and I have also
been investigating dielectric waveguides at optical frequencies, and
since 1973 I have lectured on "Optical Communications". These activities
have shown that there is a need for a tutorial introduction to the new
technical field of single- mode fibers. In this book the physical
fundamentals are emphasized and the mathematics is limited to the
absolutely necessary subjects. Besides presenting a physical explanation
of waveguiding in single-mode fibers, it is also the aim of this book to
give an overview of the knowledge accumulated in this field.