3623

3422

كارشناسي ارشد

مخابرات

اصفهان :دانشگاه صنعتي اصفهان ،دانشكده برق و كامپيوتر

1386

هشت ،80،[II]ص. :مصور ،جدول

ص.ع.بهفارسي و انگليسي

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8/5/86

ابوالقاسم زيد آبادي ،امير برجي

مهندسي برق و كامپيوتر

ID3422

به فارسي و انگليسي :قابل رويت به صورت نسخه ديجيتال

AbstractWDM is a technology which multiplexes multiple optical carrier signals on a single opticalfiber by using different wavelengths of light to carry different signals With this techniqueachievable bandwidth is about 320 Gbps Many bandwidth intensive applications such asvideo conferencing and video on demand services require multicast services for efficiencypurposes WDM Optical networks are the best candidate for this type of applications Avoiding O E O conversion to have all optical network is one of the most important issuesin this networks In all optical networks each message is transmitted from the source to thedestination by using a single wavelength if there is no same wavelength in all of the linksof the path connection is blocked To increase network performance we can usewavelength converter in the switching nodes If we use full wavelength converter blockingprobability is significantly decreased but by introducing these O E O conversion basedwavelength converters into networks we loses the advantages of all optical transmissionand switching Instead we can use all optical wavelength converter which is able toconvert any given input wavelength to a limited number of output wavelengths In thisthesis first we study previous works on multicasting in WDM optical networks andcommon routing algorithms Then we add limited or all optical wavelength converter tothe switching nodes and according to simulation result compare performance of tworouting algorithms and network performance under different wavelength conversioncapability We can see that limited wavelength conversion with small conversion degreesprovides a considerable fraction of the performance improvement obtained by fullwavelength conversion over no wavelength conversion

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