Abstract
We propose a novel photonic technique for microwave frequency measurement
based on transversal microwave filters with high resolution. Two parallel microwave
filters with sine and cosine frequency responses are obtained by cross gain
modulation in a single semiconductor optical amplifier, which introduces two
different frequency responses to achieve an amplitude comparison function. We also
demonstrate a proof-of-concept experiment. The measurement error is less than +-0.04
GHz for the first band range of 0-3.45 GHz and less than +-0.03 GHz for the second
band range of 3.45-5.8 GHz. Our scheme is found to be capable of being extended for
larger frequency range measurements using a shorter fiber length.
© 2011 Chinese Optics Letters
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