Abstract
In this paper, we study the transmission characteristics of an AOTF
operating with ultra-short light pulses (2 ps). Initially, one considers
the performance of the device, operating in the nonlinear regime without
loss. It was observed that the effect of dispersion and nonlinearity has
a strong influence on the pulse propagation when one increases the
length of the AOTF. For a shorter length device, the switched pulse
presents time broadening. For a higher length device, pulse break up was
observed. Regarding the AOTF with loss, one considers a device of 0.25
mm length with a loss of 4 dB/mm constructed with an increasing
nonlinearity profile. It was observe that the increase in beta (increase
of the final value of the profile Q(xi) of the nonlinearity) changes the
switched pulse from broadening to optical compression. One can say that
the AOTF can be operated in a configuration that avoids pulse break up
and has a switched pulse with a shorter time duration compared with the
lossy AOTF. The study of the AOTF operating with ultra-short optical
solitons provides possibilities for achieving high efficiency in
ultra-fast all-optical signal processing, especially for optical
switches, filters, and optical transistors. The acousto-optic tunable
filter (AOTF) has attracted great attention in recent years, in part
because it appears to be a suitable basis for multiwavelength optical
cross connects. It is probably the only known tunable filter that is
capable of selecting several wavelengths simultaneously. This capability
can be used to construct a multiwavelength router. (C) 2001 John Wiley
& Sons, Inc.
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