Abstract
A center frequency-tunable multi-tap bandpass microwave photonic filter
(MPF) is proposed and experimentally demonstrated. A specially designed multi-wavelength
fiber ring laser, in which a windowed Fabry-Pérot (FP) filter is used
as the wavelength selection and power control component, has been developed
to serve as the optical source for the MPF. By adjusting the windowed FP filter,
both the wavelength spacing and power profile of the multi-wavelength laser
can be changed. The output of the optical source is phase modulated by a microwave
signal. 25 km of single-mode fiber (SMF) is then used to act as a dispersive
medium to introduce time delays between taps. Thus, a tunable bandpass response
is obtained at the output of a high-speed photodetector (PD). In addition,
the passband centered at DC is removed due to the use of phase modulation.
The experimental results show that more than 45 wavelengths can be generated
in the multi-wavelength ring laser. With the electronic tuning of the wavelength
spacing, tuning of the passband center frequency of the MPF by 3 GHz is achieved.
© 2011 IEEE
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