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Register a new userThe acoustic wave tilt angle effect on the interaction type and quality factor of the tunable acousto-optic filters
تأثير زاوية انحراف الموجة فوق الصّوتيّة على نمط التّداخل و عامل الجودة للمرشّحات فوق الصّوتيّة - الضّوئيّة المولّفة
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Added by
Tishreen University ورقة بحثية
Publication date
2016
fields
Communication Engineering
and research's language is
العربية
Authors
فرح جنيكه( باحث )
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Shamra Editor
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تعدّ المرشّحات فوق الصّوتيّة-الضّوئيّة المعتمدة على تقنيّة التّداخل بين الأمواج فوق الصّوتيّة و الضّوئيّة مرشّحات عالية الأداء، حيث أنّها تملك مجال انتخابي هو الأكبر مقارنة مع الأنواع الأخرى من المرشّحات و هذا مايتيح استخدامها في شبكات التّجميع بتقسيم طول الموجة (WDM: Wavelength Division Multiplexing) البصرية، و يهدف البحث إلى دراسة نموذجين لهذه المرشّحات أحدهما يعمل وفق نمط التّداخل غير المتوازي و الآخر يعمل وفق نمط التّداخل شبه المتوازي و ذلك بهدف المقارنة بينهما من الناحية العمليّة. يهدف البحث إلى إظهار تأثير زاوية الانحراف للموجة فوق الصّوتيّة على تصميم المرشّح و فعاليته في انتخاب طول الموجة الضّوئيّة المرغوب بالإضافة إلى مقارنة منحنيات التّردد الموافقة لهذه الزوايا من حيث حساسيتها لتغيرات زاوية الورود، كما تكمن أهمية البحث في إثبات فعالية المرشّحات التي تعمل وفق النّمط شبه المتوازي للتّداخل و قدرتها على تحقيق القيم العالية جداً لعامل الجودة.
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.
References used
SADOT, D.; BOIMOVICH , E. Tunable Optical Filters for Dense WDM Networks. IEEE Communications Magazine, Vol. 36, No.12, 1998 ,50-55
SAPRIEL ,J. ; CHARISSOUX, D.;VOLOSHINOV ,V.; MOLCHANOV, V. Tunable Acoustooptic Filters and Equalizers for WDM Applications. Journal of Light Wave Technology, Vol. 20, No.5, 2002, 892-899
MOLCHANOV,V.;MAKAROV,O.Quasi collinear acousto optic filters using strong acoustic anisotropy in tellurium dioxide crystal.Journal of Physics: Conference Series92, 2007
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incidence and long term complications. These complications are mainly a consequence of
macro-vascular and microvascular damages of the target organs. The incidence of
several
pulmonary abnormalities during the course of Diabetes Mellitus because the presence of
an extensive microvascular circulation and abundant connective tissue in the lungs , raises
the possibility that lung tissue may be a target organ in diabetic patients.
Objectives: This research is designed to study the impact of DM and both the
duration of the disease and the glycemic control on pulmonary function tests.
Methodology: This is a cross-sectional study carried out on 75 patients with type II
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Conclusion: The findings of the present study suggest that, the lung is a target organ
for damage in DM and diabetics show a decrease in PFTs with a restrictive pattern lesion
compared with non-diabetics . And this deterioration is exaggerated in uncontrolled
diabetics and with the long duration of DM .
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