Abstract
A continuously tunable microwave fractional Hilbert transformer (FHT) implemented
based on a nonuniformly spaced photonic microwave delay-line filter is proposed and
demonstrated. An FHT has a frequency response with a unity magnitude response and a
phase response having a phase shift between 0 and π at the center frequency. A
seven-tap photonic microwave delay-line filter with nonuniformly spaced taps is designed
to provide such a frequency response. The advantage of using nonuniform spacing is that
an equivalent negative coefficient can be achieved by introducing an additional time
delay leading to a π phase shift, corresponding to a negative coefficient. An FHT
operating at a center frequency around 8.165 GHz with a tunable order between 0.24 and 1
is implemented. A classical HT operating at a center frequency of 7.573 GHz with a
bandwidth greater than 4.5 GHz is also implemented. The use of the classical HT to
perform temporal Hilbert transform of a Gaussian-like electrical pulse is
demonstrated.
© 2012 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription