Haidar N. Al-Anbagi, Sadeq Adnan Hbeeb, Ahmad S. Abdullah, Enhancement the Performance of 2×2 MZI Electro Optical Switch based on Lithium Tantalate LiTaO3, Journal of Engineering and Applied Sciences, Volume 14,Issue 18, 2019, Pages 6885-6889, ISSN 1816-949x, jeasci.2019.6885.6889, (https://makhillpublications.co/view-article.php?doi=jeasci.2019.6885.6889) Abstract: This research presents a technique of an electro optic effect and electro-refractive which considered as one of the important techniques in the optical communication systems. In this study, a method is introduced to solve the problem of large length of 2×2 MZI electro-optical switch forlithium tantalate LiTaO . By using 3 mathematical model for designing MZI electro-optical switch by analyzing the effect of external electrical field on the refractive index with better electro-optical coefficient and refractive index. Finally, in this research, the researchers achieved better performance with low driving electrical field, small size of switch and wide band using near infrared wavelength. Keywords: Lasersource;2×2 Mach-Zehnder interferomet erelectro-optical switch;electro-optic effect (pockelseffect);electro-refractive technique;electro-optic material;analyzing