Increasing data rate in optical communication systems leads to nonlinear electromagnet phenomenon in optical signal along fiber, and causes distortion in it.Thefiber dispersion is a linear phenomenon that causes difficulties toachieve high bit rate a
nd distance product.The limiting of nonlinear effects requireslow input power level, but this induces lowsignal to noise ratio. So, we search another solutions.
This paper studies Split Step Fourier Transform Algorithm (SSFTM) used to solve partial differential nonlinear Schrödinger equation (NLSE).Then, we use it for simulating optical signal propagating in fiber by using MATLAB program, and designing fiber optic block could add it to MATLAB Simulink Library. Finally ,in this paper, we achieved results for selecting important parameters in single mode fiber for high bit rate, for improving bit error rate and Qcoefficient.
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.
The aim of this study is to study the possibilities of obtaining materials with a material
shift to the higher wavelengths that fall within the C-Band window currently used in fiber
optic communication systems. This is done by mixing pure SiO2 with
different materials
and different percentages. We find the evidence of refraction of the core material in an
optical fiber and study the change of these clues by sequential wavelength of light from the
solimer constants obtained from the OptiFiber program. We then calculated the physical
dispersion factor DM for each of the studied materials by writing a special matlab program
for this study and thus studying the change in the physical dispersion of these materials by
the sequential wave length.
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.
