Abstract
We propose and demonstrate a photonic approach to instantaneous frequency measurement
with an extended range based on phase modulation. In the measurement system, two optical wavelengths
and two dispersion fiber segments are used to construct the frequency-dependent amplitude comparison
functions (ACFs). Several ACFs can be utilized jointly to determine the microwave frequency without
ambiguities beyond a monotonic region of the lone conventional ACF. The measurable range of
microwave frequency can be extended and the accuracy can be improved by selecting an ACF with a
large slope. The experimental results show that the errors are limited within ±140 MHz of a
frequency measuremental range from 8 to 20 GHz.
© 2013 Chinese Optics Letters
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