Abstract
We perform a detailed theoretical and experimental study on the impact
of the finesse (<i>F</i>) of
a multiple wavelength channel optical filter on output microwave filter transfer
function in a spectrum slicing-based photonic microwave finite-impulse response
(FIR) filter. For this paper, we use the combination of a digital micromirror
device-based spatial light modulator and a continuous-wave, depolarized supercontinuum,
since it allows us to perform flexible reconfiguration of output filter transfer
function. It is found that the superimposed broadband, low-pass RF transfer
function induced by the wide linewidth single-wavelength channel effectively
suppresses higher order, periodic resonance peaks as the <i>F</i> is reduced. The optical filters with <i>F</i> = 2 are found to provide
the most effective suppression of higher order peaks, whatever the single
channel waveform is: sinusoidal or Gaussian.
© 2008 IEEE
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