Abstract
We propose and demonstrate a new modified Lyot filter to independently ensure the
channel amplitude equalization and the bandwidth tuning functions. The device consists
of hybrid liquid crystal interferometers. We show numerically and experimentally that
for a modified four-stage Lyot filter, the two first interferometers ensure equalization
function with a maximum extinction ratio, while the last interferometer allows
full-width at half-maximum tuning function by using, in particular, the optical
canceling approach. Such a device is highly desirable in optical telecommunications,
especially where in the core network the optical filters must perform several other
functions in addition to their basic amplitude filtering action.
© 2012 IEEE
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