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The twentieth century has witnessed phenomenal growth in
silicon-based semiconductor technology. This revolution, however,
will be dwarfed by photonics technology in the twenty-first
century. In this respect, erbium (a rare-earth element of the
lanthanide series ), will be to photonics technology what silicon
is to semiconductor technology. In this book, spotlight shines on
the novel usage of erbium in amplifying optical signals V, a much
desired phenomenon implemented in optical communication systems.
Due to various loss mechanisms, there is a gradual reduction in the
power of light as it propagates through a communication channel,
and to recover that, amplification of light becomes vital. Further,
this remains very important in order for the information carried by
the light to be discernible at the receiving end as there exists a
minimum threshold power which the light must always possess.
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