Аннотация
In this paper we propose the operation of an all-optical logical gate
based in an acousto optical tunable filter (AOTF) operating with a pulse
position modulation (PPM). The performance of an AOTF realizing
two-input AND/OR logical functions, which can be applied in transmission
and processing of signals in all-optical form in TDM systems, was
examined. This novel integrated acousto optical logical gate operates
with two ultrashort soliton light pulses (2 ps), which are modulated in
agreement with the technique of pulse position modulation (PPM).
Initially, we evaluated the effect resulting of an increment in the
acousto optical interaction length, for the temporal position of the
output pulse, considering the anomalous group velocity dispersion (GVD),
nonlinear self phase modulation (SPM) and without loss propagation
regime of TE and TM input pulses not modulated. We have analyzed the
four possible situations for the two-input logical gate, modulating the
TE and TM input pulses through temporal displacement and allowing a
variation in the coding parameter offset (epsilon). We can conclude that
is possible to get AND/OR logical operations for the modes TM or TE,
without to insert PPM error, since a phase control (Delta phi) exists
(applied on the TM input pulse) in agreement with each situation in the
truth table. Finally we defined the truth table, considering the
adequate phase difference and coding parameter offset for the operation
of the AND/OR logical gate based in the AOTF. (c) 2007 Elsevier B.V. All
rights reserved.
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