7715

7187

كارشناسي ارشد

الكترونيك

اصفهان: دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر

1391

ده،106ص.: مصور،جدول،نمودار﴿رنگي﴾

ص.ع.به فارسي و انگليسي

اصغر غلامي

ابوالقاسم زيدآبادي نژاد

22/2/92

ذاكر حسين فيروز، مسعود عمومي

مهندسي برق و كامپيوتر

ID7187

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Design and Implementation of 4 25Gb s Optical Fiber Receiver Based on IEEE802 3Z Gigabit Ethernet Standard Mahdi Malekane Rad m malekanerad@ec iut ac ir Date of Submission 2013 08 01 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Asghar Gholami gholami@cc iut ac ir Abstract Increasing demand of high speed digital services increases the use of optical communication systems Optical transmitter optical fiber as communication channel and optical receiver are three main parts of these systems Short haul and long haul optical communication are as application area Local Area Network LAN is one of the short haul applications that provides the capability of high speed connection between different parts of the network With increasing the data rate Gigabit Ethernet GbE network protocol has been introduced and its primary standard has adjusted by IEEE for optical fiber networks 1000Base Sx part describes the characteristics of optical fiber transceiver based on Multimode Optical Fiber MMF at 770 to 860nm wavelength for 220 to 550m distances In this thesis design and implementation of optical receiver based on 1000Base SX part of IEEE802 3Z standard of GbE networks is described Because of low cost optical elements at 850nm the use of this wavelength is common The use of Vertical Cavity Surface Emitting Laser VCSEL is common as light source in the transmitter of short haul optical communication systems VCSEL driver modulates the digital signal on the VCSEL output optical power So the input digital signal is transmitted as the VCSEL light intensity fluctuations Optical signal is transmitted by MMF and reaches to the optical receiver Photodiode converts the optical signal to the electrical current signal Due to losses in the channel and connectors the received current intensity is low and can be strongly affected by noise Amplifiers amplify and convert the current to the voltage signal In the implemented system appropriate high frequency transmission lines are needed to transmit high speed signals Scattering parameters of transmission lines have simulated by Advanced Design System ADS software and their dimensions are optimized for minimum reflection and good impedance matching between input and output ports The measurement results of implemented optical receiver show that at 4 25 Gb s bit rate and received optical power less than 17 7dBm output signal eye diagram have good quality and pass the GbE eye diagram mask Bit Error Rate BER test at 4 25Gb s bit rate 1000m fiber length 9 3dBm transmitter power and 13 66dBm received power is done to determines the receiver sensitivity The implemented optical receiver has the sensitivity better than 13 66dBm with the BER less than 10 12 Keywords Optical receiver Photodiode Limiting amplifier Sensitivity BER

اصغر غلامي

ابوالقاسم زيدآبادي نژاد

ذاكر حسين فيروز، مسعود عمومي