9551

8818

كارشناسي ارشد

برق - الكترونيك

اصفهان: دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر

1393

[نه]،91ص.: مصور

ص.ع.به فارسي و انگليسي

مسعود عمومي

29/11/93

اصغر غلامي

مهندسي برق و كامپيوتر

ID8818

Analytical And Comparative Evaluation Of Electrooptics Effects In The External Optical Modulators Sayed Mohsen Mohseni Kahangi Sm mohseni@ec iut ac ir Date of Submission 22 9 2014 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisor omoomi@cc iut ac ir AbstractModulation is the process in which high frequency carrier wave parameters arealtered corresponding to changes in a lower frequency data signal It is obviousthat using a carrier signal in the optical frequency range increases the bandwidthusage and decreases the size of elements So it can increase the volume of datatransmission in optical fibers Modulator role in this system is reshaping ofinformation in the form of digital or analog signal from a continuous wave laserof LED source Optical modulator as one of the main components in opticalcommunication systems can be divided in two types of external and internal direct modulators Due to devastating effects and restrictions like chirp effect inthe internal modulators external modulators are used for large distances Thiskind of modulators is based on the electro optic and magneto optic effects Evaluation and comparison of different types of external modulators are discussedin this thesis Also the waveguide photonics crystal modulators are introduced andsimulated and some proposals for the improvement of their structures arementioned Keyword polarization External modulator Anisotropic medium Electro optic and Magneto optic effects Photonic crystal

مسعود عمومي

اصغر غلامي