International Journal of Modern Nonlinear Theory and Application, 2016, 5, 67-72 Published Online March 2016 in SciRes. http://www.scirp.org/journal/ijmnta http://dx.doi.org/10.4236/ijmnta.2016.51007 How to cite this paper: Bhattacharyya, A., Gayen, D.K. and Chattopadhyay, T. (2016) Design of 2-to-4 All-Optical Decoder with the Help of Terahertz Optical Asymmetric Demultiplexer. International Journal of Modern Nonlinear Theory and Ap- plication, 5, 67-72. http://dx.doi.org/10.4236/ijmnta.2016.51007 Design of 2-to-4 All-Optical Decoder with the Help of Terahertz Optical Asymmetric Demultiplexer Arunava Bhattacharyya 1 , Dilip Kumar Gayen 1 , Tanay Chattopadhyay 2 1 Department of Information Technology and Computer Science, College of Engineering & Management, Kolaghat, India 2 Mechanical Operation (Stage-II), Kolaghat Thermal Power Station, WBPDCL, West Bengal, India Received 10 December 2015; accepted 7 March 2016; published 10 March 2016 Copyright © 2016 by authors and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/ Abstract An all-optical 2-to-4 decoder unit with the assist of terahertz optical asymmetric demultiplexer (TOAD) is presented. The all-optical 2-to-4 decoder with a set of all-optical switches is designed which can be used to achieve a high-speed central processor unit using optical hardware. The unique output lines can be used for all-optical header processing. We attempt to develop an inte- grated all-optical circuit which can perform decoding of signal. This scheme is very simple and flexible for performing different logic operation and to design advanced complex logic. Simulated results are confirming the described methods. Keywords Terahertz Optical Asymmetric Demultiplexer, Semiconductor Optical Amplifier, All-Optical Decoder 1. Introduction By the advent of optical networks and optical communication systems need for all-optical circuits and devices has been started. Currently communication networks aim to reach very bit rates and ultrafast data transfer rates with terabit per second bit rates. In order to achieve such a high bit rate, we should have a complete optical net- work without any electronics to optical conversion. In such a network, all communication steps such as sending, receiving and data processing should be performed totally in optical domain. A decoder is important for header processing in typical core router/demultiplexer for addressing output port. There are many research areas which