Abstract
An electrically controlled filter for the selection of channels in a DWDM optical network is proposed. The wavelength selectivity is obtained by combining the electrical injection of free carriers in a forward biased p-i-n diode with a Bragg grating realized over the top of a Silicon on Insulator (SOI) rib waveguide. Apodization of the duty-cycle of the grating has been investigated in order to reduce the crosstalk between adjacent channels; in this way the performances of the filter in terms of spectral bandwidth for 100 GHz and 50 GHz DWDM spacing become attractive.
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