When the light incident on a multilayer planar mound, it is reflected, transmitted, and absorbed in the method that derived the Fresnel equations. The metal used in this work is the thin film of gold put on the glass. The properties of the preparation of waveform for dielectric charged surface Plasmon polariton structure of the bearing surface of the carrier plasma were studied using a simple transport matrix method(TMM), The Transfer Matrix Method (TMM) used to calculate the reflection, transmission & absorption for both TE (transverse wave) and TM (magnetic browser for the oblique incident plane wave. The relation between the incident angle with the Fresnel coefficient plotted at the different wavelength regimes (300nm,700nm,1200nm) was plotted using the program of the TMM written in Matlab (R2013). The best result for this Fresnel coefficient in the visible incident plane wave with wavelength = 700nm.

Fiber Bragg Grating FBG Works as a filter within a specific range to counteract the light whose wavelength is within the filter range and allows the light whose wavelength is outside the range of the filter to pass through the carrier light-medium. In communications (fiber-optic) the FBG is used to separate the optical signals. In this paper, the nonlinear optical properties study for optical transmission that consists of an optical transmitter that is transmitting the signal to two different fiber design first is single-mode fiber and second is Coarse Wavelength division multiplexing (CWDM) fiber. Then we enter the Bragg Grating on these two fiber and studies the effect of the Bragg on them. The nonlinear optical characteristic (Q factor and bit error rate BER) is calculated for different fiber length (Km) and input power (dBm) applied on these two fibers and found the best fiber type that has a high Q factor and zero BER. By using optiwave software and matlab (R2015) software program to measure the quality factor, eye diagram and BER of the received signal at the receiver, Results are obtained and installed with graphs and tables.

This study is to obtain a better understanding of how to shape the pulse laser spectrum by varying the material properties of the photonic crystal fiber (PCF). This includes the ability to obtain spectral power in particular wavelength regions, and obtaining a broad bandwidth.. Numerical modeling of the split step Adaptive Fourier method has been used to solving a form of nonlinear Schrödinger equation, which describes the propagation of pulses in PCF. It was investigated how the spectrum can be controlled through dispersion property. The electromagnetic wave that send from IR laser diode source through the PCF to the observer. the optical properties of this electromagnetic wave, normalized power, intensity, dispersion, and group delay dispersion will be studied for the input, output and observer laser pulse. The compared of the different two materials of PCF (fused silica and Barium-fluoride BaF2) that be used and studies.

The mode group diversity multiplexing (MGDM) multicast technology uses optical multiple input and output (O-MIMO) technology to provide greater capacity and the ability to transmit information over multi-mode fiber (MMF). The MGDM system has a benefit in terms of capacity expansion, which led to interest in its use in most optical communications. The MGDM exploits the optical fiber bandwidth by inserting spatial light detection, which increases the capacity of the MMF. This research aims to study the optical systems used for the MGDM technology, and to identify the methods of their analysis and design of O-MIMO systems to increase the amplitude of this signal. The conditions of light entry into the optical fiber such as typical spot size, radial displacements, angle, wavelength, and radius of the detectors sections are improved. Numerical MATLAB simulation is used to improve the amplitude of graded index multimode fiber (GI-MMF) and compared to the existing aggregation systems. Moreover, this method was simulated to improve the input and detection conditions to increase the O-MIMO capacity using the MGDM technique. Finally, the capacity of the MGDM system was studied and compared with different channels, and it is noticed that the capacity of the system increases with increasing the number of channels.