Abstract
In this paper, we did a study of the transmission characteristics of the AOTF operating with ultrashort light pulses (2ps). Initially one consider the performance of the device, with several lengths, operating in the nonlinear regime without loss. It was observed that the effect of dispersion and nonlinearity has strong influence on the pulse propagation when one increase the length of the AOTF. For shorter length of the device the switched pulse is presenting time broadening. For higher length of the device, pulse breakup was observed. Considering the AOTF with 4 dB/mm of loss, one consider the device of length 0.25 mm constructed with an increasing nonlinearity profile. It was observed that the increase in β (increase of the final value of the profile Q(ξ) of the nonlinearity) lead the switched pulse from broadening to optical compression. One can say that one can operate the AOTF in a configuration that one can avoid the pulse break up and have a switched pulse with a shorter time duration compared with the lossy AOTF. The second AOTF present a higher length (0.76 mm) with higher loss (40 dB/mm) is leading the switched pulse to a strong broadening. In the presence of the nonlinear profile configuration we start having pulse break up. With the increase of the β parameter the pulse is showing break-up where the more intense pulse is shorter than the input pulse. One can say that is possible to operate the AOTF in a situation where the switched pulse present a less intense satellite pulse. The study of the AOTF operating with ultra short optical solitons provides possibilities for achieving, high efficiency in ultrafast all-optical signal processing, especially for optical switches, filters and optical transistors. The acoustic-optic tunable filter (AOTF) has attracted great attention in recent years, in part because it appears to be a suitable basis for multi-wavelength 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 multi-wavelength router.
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