Abstract
In this paper, we report on an integrated optical wavelength filter device in
LiNbO$_{3}$. A sequence of individually addressable polarization converters enables
programmable spectral response and continuous wavelength tunability.
Wavelength-selective polarization conversion is obtained using in-phase and
quadrature-driven electro-optic converters. A model based on coupled-mode analysis is
presented that allows to determine the filter performance. Examples of tailoring the
spectral response to obtain strong sidelobe suppression and flat-top responses are
discussed. Predicted theoretical results are confirmed by experiments. A 2.3 nm wide
bandpass filter with more than 20 dB sidelobe suppression and a tuning range of about 20
nm are demonstrated. Moreover, even a flat-top characteristics with 4.9 nm bandwidth and
about 15 dB sidelobe suppression could be demonstrated with the same device.
© 2010 IEEE
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