Abstract
In this paper, we aim to design a compact structure that can work both as an optical
adder and subtractor. Also, as far as we know, one of the main
disadvantages of previous optical adders or subtractors is that,
inside a single structure, the levels of optical intensity for logic 1
at different output ports are different. In this work, we aim to solve
this issue, too. For this purpose, two separate structures were
designed for the half-adder and half-subtractor. The final structure
was realized by combining these structures and adding an extra control
port. When the control port is 0, the structure can work as an optical
half-adder; however, when the control port is 1, the proposed
structure can work as an all optical half-subtractor. The simulation
results show that the rise time and ON/OFF contrast ratio are about
1.5 ps and 18.3 dB, respectively. Also the simulation results prove
that the output levels for logic at all the output ports are at
similar levels.
Funder
Research Project of University Laboratory
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering
Cited by
5 articles.
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