Abstract:
The optical communication system can transmit video, voice, data, and multimedia services
across long distances. The performances of all optical fiber communications systems affected
by factors like chromatic dispersion, polarization mode dispersion, attenuation, and non-linear
effects at the time of transmitting information are from one place to another. Therefore, it is
vital to minimize the dispersion and amplify all the light signals at the same time after a certain
interval of light propagation to recover the original signal.
In this thesis, investigation done to improve the overall system of the optical transport network
performance by using optimally placed Fiber Bragg Grating for dispersion compensation and
an optical amplifier to increase the attenuated signal power. In this thesis, performance analysis
of different channels of the Dense Wave Division Multiplexing network at different parameters
done based on fiber Bragg grating and erbium-doped fiber amplifier as dispersion
compensation and amplification mechanism using opti-system software. Here first we analyzed
the fiber communication system without Erbium Doped Fiber Amplifier and Fiber Bragg
Grating dispersions compensations techniques. Secondly, optical communications systems
evaluated by using different dispersions compensator techniques of Fiber Bragg grating and
Erbium Doped Fiber Amplifier.
The performances of the three dispersions compensators of the FBG has been evaluated based
on various parameters like input power, distance, Q factor, Bit Error Rate, eye height, and
threshold level at the receiving end. It is possible to observe and easily take the best dispersions
compensators for new deployment of DWDM systems for a given distance, data rate,
transmission power, and capacity, especially for campus, huge private and public service that
needs long haul high traffic network. In our work Symmetry FBG dispersions compensators
are the best compensators than pre and post FBG dispersions compensators for long distance
communications. Symmetry FBG dispersions compensators have a good quality factor and
BER than pre and post FBG desperations compensators for a given four, eight, thirty and forty
numbers of channels. For four channels, quality factor improved using Mix-FBG and EDFA
for 2.5, 5 and 10Gbps to the maximum / minimum of 65.6/57.9, 57.9/4.6 and 4.6 respectively.
From the result, Mix-FBG dispersion compensators for four channels DWDM systems have a
good quality factor than pre and post FBG dispersions compensators.
In addition, I suggest for the future work to do for higher data rate transmissions by different
configurations of dispersions compensations techniques of FBG for a number of channels
