Table of Contents
Advances in Optical Technologies
Volume 2014, Article ID 275083, 13 pages
Review Article

All-Optical Logic Gates: Designs, Classification, and Comparison

1Department of Electronics and Communication, University of Allahabad, Allahabad 211002, India
2Department of Physics, S. D. (PG) College, Muzaffarnagar, India

Received 20 September 2013; Revised 1 February 2014; Accepted 9 February 2014; Published 19 March 2014

Academic Editor: Zoran Ikonic

Copyright © 2014 Pallavi Singh et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The paper reviews the current status and designs of all-optical gates. Various schemes with and without semiconductor optical amplifiers are discussed and compared. The optical gates are classified according to their design structures. It is divided into two major divisions that is, nonsemiconductor optical amplifier based gates and semiconductor optical amplifier based gates. In nonsemiconductor optical amplifier based gates, different schemes have been proposed to create non-linearity which is discussed. The semiconductor optical amplifier based gates of different design structures are discussed to show the probe pulse that is modulated in different ways to obtain results.