الفهرس 
acknowledgmentOnly 14 pages are availabe for public view
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Abstract
The farsight of Charles K. Kao on the use of glass optical fibers for
long distance optical information transmission has proved to be one of the
most remarkable events in the history of modem science and
technology [1, 2, 3]. His ideas and predictions have essentially all been
embodied in the present optical fiber communication systems.
Historically, after a period of studying step-index single-mode fibers
(the first low-loss fiber made, as reported by the Coming group in 1970,
was a single-mode fiber) [I], the attention turned to large core size graded-
index multi-mode fibers, because of the uncertainty about the
manufacturing and the practical use of single-mode fibers whose cores
were about 5 times smaller.
The richness of theoretical problems associated with analysis of
graded-index multi-mode fibers had attracted many early researchers to
work on the multi-mode fiber waveguides. However, the difficulty ill
realizing the theoretically-possible bandwidth in the actual manufacturing
and the uncertainty in predicting the effective bandwidth of the
concatenated multi-mode optical fibers soon discouraged any significant
further effort on graded-index multi-mode fibers.