Vibration of Ultrasonic has used for scaling
and periodontal curettage, it is also has used for metal crown and
metal-ceramic crown removal, subsequently, using the tips whether for
scaling or removing crown, they will be in direct contact with th
is crown,
This research aimed to evaluate the surface of metal-ceramic crown
after exposure to Vibration of Ultrasonic tips.
The acousto-optic filters that depend on the interaction technology between the
optical and ultrasonic waves are considered a high- performance filters as they have the
largest tuning range compared to other filters types. These filters can be used
in optical
WDM (Wavelength Division Multiplexing) networks.
This work aims to study two types of these filters, one operates according to the
non-collinear type of interaction, whereas the other type operates according to the quasicollinear
type of interaction, and compare between these two filters types from the
practical side. Thus, this work aims to show the tilt angle effect of the acoustic wave on the
filter's design and its efficiency in electing the desired optical wave length, in addition to
compare the frequency curves related to these angles in terms of their sensitivity to the
changes of the incidence angle.
The importance of this work lies in proving the efficiency of the filters operating
according to the quasi-collinear type of interaction and their ability to achieve the high
values of quality factor.
This research proposes the development of Optical Network Units by introducing an
all optical Filter. This optical filter can treat WDM and PDM technology at the same time
enabling us to send a channel on the horizontal and vertical of the same wav
elength .The
hybrid WDM-PDM technology allows to delivery double channels for users without any
changing in infrastructure between optical central office and user . Firstly , this article
prove the idea of hybrid WDM-PDM technology by OptiSystem7.0 simulator, secondly we
study proposed all optical Filter for three cases of optical access: WDMPDM(
Downstream), WDM(Downstream)/( TDM(Upstream) , WDM(Downstream)/
WDM(Downstream) recommended by the international communication federation, ICF.
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.
