Abstract:
Exponential increase in the requirements of resources from internet users causes proliferation
in the internet tra c. In this regard, the optical network o ers data transmission
between sender and receiver through optical bers which is faster and reliable than any other
network i.e. wireless network and copper wired network. Due to such e ciency optical network
is known as backbone of the internet.
Although, optical networks are very optimistic solution to ful ll demands of internet
tra c but there are some optical layer constraints and physical impairments which should
be taken under consideration to cope with increasing demands. Some of these impairments
are signal degradation, inappropriate modulation scheme and ine cient algorithm scheme
etc. When signal propagates over a link from sender to receiver, this signal degrades with
the time and distance covered. erefore, to reach on its nal destination that signal must be
regenerated. Optical signal can be regenerated by placing optical regenerator on the optical
link where the signal starts to degrade. However, adding these regenerators in the network
is not a very e cient approach. So it is required to upgrade the network. In this thesis, the
optical network is enhanced by selectively upgrading the optical line amplifiers.
e outcome shows that this approach can provide a great reduction in number of regenerators
which are placed in the network topologies and makes network more transparent
and efficient.
