Abstract
A microwave bandpass differentiator implemented based on a finite impulse
response (FIR) photonic microwave delay-line filter with nonuniformly-spaced
taps is proposed and experimentally demonstrated. To implement a microwave
bandpass differentiator, the coefficients of the photonic microwave delay-line
filter should have both positive and negative coefficients. In the proposed
approach, the negative coefficients are equivalently achieved by introducing
an additional time delay to each of the taps, leading to a π phase shift to the tap. Compared
with a uniformly-spaced photonic microwave delay-line filter with true negative
coefficients, the proposed differentiator features a greatly simplified implementation.
A microwave bandpass differentiator based on a six-tap nonuniformly-spaced
photonic microwave delay-line filter is designed, simulated, and experimentally
demonstrated. The reconfigurability of the microwave bandpass differentiator
is experimentally investigated. The employment of the differentiator to perform
differentiation of a bandpass microwave signal is also experimentally demonstrated.
© 2011 IEEE
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