7996

7431

كارشناسي ارشد

الكترونيك

اصفهان: دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر

1391

ده،106ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

اصغر غلامي

رضا صفيان

9/7/92

مهندسي برق و كامپيوتر

ID7431

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

108 Design and Implementation of 4 25 Gbps Fiber Optic Transmitter in Accordance with 1000BASED SX Gigabit Ethernet Standard Zahra Mazaheri z mazaheri@ec iut ac ir Date of Submission 2013 01 23 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 Optical communication had an very high growth through the modern communication systems Particularly optical fiber communication plays an important role in development of high speed telecommunication systems optical communication systems are divided into free space and fiber optic communication systems Free Space Optics FSO is a line of sight technology that uses lasers to provide optical bandwidth connections Fiber optic communication systems use fiber optic as communication channel and have many applications in high speed data transmission for short and long haul systems Today optical fibers are also used in the Internet and local area networks LAN to transfer very high data rates Gigabit Ethernet is a standard for high speed telecommunication systems which is defined in the IEEE802 3z standard 1000BASED SX is a part of the Gigabit Ethernet standard which defines short haul multimode optical fiber communication systems In this thesis optical transmitter parameters and components for a short haul multi mode optical fiber communication system have been studied and an optical transmitter in accordance with 1000BASE SX standard has been designed and implemented The transmitter can send data at 4 25 Gbps bit rate over 1000m MMF on the 850 nm wavelength The input electrical signal with 4 25 Gbps have a wideband spectrum To transfer this high frequency signal from input terminals to the amplifier and from amplifier to the laser input transmission lines are used Different transmission lines as differential coupled microstrip and CPWG Coplanar Waveguide with Ground lines are designed and optimized using ADS software Vertical Cavity Surface Emitting Laser VCSEL due to its low cost and high power and coupling efficiency is a good selection as the light source for short haul multimode fiber communication systems But VCSEL parameters are temperature dependent which cause output optical power be highly sensitive to the temperatur Therefore a control circuit is designed to keep the VCSEL s average power constant with feedback mechanism All components are assembled onto a 4 layerd FR 4 printed circuit board PCB Finally the parameters of the transmitter are measured and are compared with standard values Since BER test is the best way to ensure the correct functioning of a transceiver system this test is performed to ensure the verification system Keywords Optical transmitter VCSEL Vertical Cavity Surface Emitting Laser driver Extinction Ratio ER optical power power penalty Transmission line Differential coupled microstrip CPWG Coplanar Waveguide with Ground PDF created with pdfFactory trial version www pdffactory com

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