Optical filter is one of the most accurate and important elements in pure optical communication network which uses wavelength division multiplexing (WDM). This research includes studying Acousto Optic Tunable Filter (AOTF) in linear anisotropic mediu
m, which depends on the interaction principle between optical waves and acoustic waves.
This paper describes simulating and testing the AOTF in MATLAB/Simulink software which is a strong tool for simulating and designing various systems. We have achieved an AOTF model, and created special block which could be added to MATLAB Simulink Library. We have also evaluated the performance of this filter and its ability to select one wavelength between the set combined by WDM. Moreover, we have studied the effect of acoustic wave frequency, its velocity, the properties of the crystal used in manufacturing it, and other influent parameters, along the selected wavelength.
Studying is showed that the amount of exchanging information in the network
surprisingly grows due to developing new communication services. But, when data rates
increase the optical system performance degrades due to dispersion, which was taken in
to
account in this research. Where as the reduction of dispersion losses is important in optical
networks. Fiber Bragg Grating (FBG) is one of the most important components of optical
communication systems, and one of the effective methods used for this goal.
This article tests the effect of using FBG as dispersion compensator in optical
communication systems, where we simulate optical communication system using FBG.
And study the effect of Erbium Doped Fiber Amplifier (EDFA) and FBG and fiber optic
parameters on this system performance, and it has been finding the best values of the
system parameters. Which the simulation model depended on two Optisystem7 and Matlab
software. We evaluate performance through eye diagram and two factors Q, Bit Error Rate
(BER).
Modern and future optical networks rely on wavelength divisional multiplexing
technology, it was necessary to developed the whole network elements to keep up with the
increasing need to offer a wide band and a very short time delay and high reliabi
lity, and
replacement of electro optic equipment with optical equipment.
Optical amplifiers have taken an important part in this evolution, and the Raman amplifier
(RAMAN) had a great deal of attention, for its high gain and flattened gain.
In this paper, we have examined the effect of both fiber parameters and pump parameters
on the performance of Raman optical amplifier in terms of gain and bandwidth and the
used pump power.
This research demonstrated the effect of multi pump on this amplifier performance and its
flattening and bandwidth, and we reached a flattening gain on a wide bandwidth.
The simulation was done by using MATLAB and OPTISYSTEM program based on the
mathematical equations that describe the amplifier model for 1450nm-1650nm bandwidth.
