Abstract
In this paper, we investigate the switching process in a triangular (T)
and planar (P1 and P2) symmetric three-core nonlinear fiber coupler
(TNLDC) operating in the CW regime. We have numerically shown, via the
coupled nonlinear Schrodinger equations (NLSEs), that AND, NAND, OR,
NOR, XOR, NXOR and NOT logic gates can be constructed. The first
configuration, a triangular (TNLDC-T) symmetrical structure, is composed
with three cores in an equilateral-triangle arrangement and using a
control signal (CS) applied to the first core. The PI and P2
configurations presents a planar symmetrical structure with three cores
in a parallel equidistant arrangement, with different input positions of
the control signal (CS). In the Pl configuration the CS is applied to
the input of the first fiber (core 1) while for the P2 configuration the
CS is applied to the input of the central fiber (core 2). Looking at the
transmission characteristics of the device, through the direct and cross
channel, we did a study of the extinction ratio (XRatio(dB) of these
devices. In comparing the performance of all switches operating as logic
gates we will use the figure-of-merit of the logic gates (FOMELG(dB))
defined as a function of the extinction ratio of the gate outputs. (C)
2007 Elsevier B.V. All rights reserved.
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