Abstract
In this paper, we investigate the switching process in triangular
symmetric and planar symmetric three-core nonlinear fiber coupler
(TNLDC) and we have numerically shown, via the coupled nonlinear
Schrodinger equations (NLSEs), that logic gates AND, OR and NXOR can be
constructed from a triangular TNLDC while the planar TNLDC produced
logical gates AND, NAND, OR, and XOR. We consider two basic models. The
first, one triangular symmetrical structure with three cores in an
equilateral-triangle arrangement and using a control signal (CS) applied
to the first core and the second model present a transverse symmetrical
structure with three cores in a parallel equidistant arrangement (or
planar symmetrical structure), however the position of the control
signal (CS) is applied to the input of the first fiber (core 1). Looking
at the transmission characteristics of the device, through the direct
and cross channel, we did a study of the extinction ratio (Xratio) of
these devices. In comparing the performance of both 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.
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