Acousto-Optic Tunable Filter (AOTF) Revisited: Ultrashort Optical Pulses Crosstalk Studies on the Lossy Filter |
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| Authors: | C S Sobrinho A F G F Filho J C Sales A F M Neto E F De Almeida A S B Sombra |
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| Institution: | 1. Laboratório de Telecomunica??;2. es e Ciência e Engenharia dos Materiais (LOCEM) Departamento de Física , Universidade Federal do Ceará , Fortaleza , Ceará , Brazil;3. Departamento de Engenharia de Teleinformática (DETI) , Centro de Tecnologia Universidade Federal do Ceará , Fortaleza , Ceará , Brazil;4. es e Ciência e Engenharia dos Materiais (LOCEM) Departamento de Física , Universidade Federal do Ceará , Fortaleza , Ceará , Brazil |
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| Abstract: | We examine again the crosstalk level (Xtalk) and extinction ratio (Xratio) of an acousto-optic tunable filter (AOTF) operating with ultrashort light pulses (2 ps), now considering the loss effect. The compression factor was studied for the switched pulse with lossy AOTF (α dB = 4 dB/mm) considering five nonlinearity profiles. One can observe that there is always an optimum value for δ (final value of the nonlinearity) that one can obtain a switched pulse with the same time duration of the input pulse (C = 1). The compression factor for the switched pulse along the filter length shows that for the constant profile, the compression factor is around 1 all over the device. The study of the crosstalk level (Xtalk) of this device, considering the optimum values of δ obtained from the compression studies, as a function of the pump power (P 0) was done. The acousto-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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| Keywords: | acousto-optic filter optical crosstalk |
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