A novel measurement of instantaneous frequency in channelized receiver based on OFC is proposed and demonstrated. The result shows that the microwave frequencies within dozens of gigahertz can be measured.
A microwave photonics instantaneous frequency measurement scheme with
14 channels based on an optical frequency comb (OFC) is proposed. In
this scheme, a 14-line flat OFC is generated by cascading a
dual-parallel Mach–Zehnder modulator (DPMZM) with a Mach–Zehnder
modulator (MZM). The intercepted microwave signal with
multiple-frequency components can be measured by using DPMZM,
Fabry–Perot filter (FPF), wavelength division multiplexer (WDM), and
optical power detector array. This scheme can measure and analyze the
frequency of microwave signals in the ranges of 0.5–13.5 GHz,
13.5–26.5 GHz, and 26.5–39.5 GHz with the measurement accuracy of
±
0.5
G
H
z
. The reconfigurability of the system
can be realized by adjusting the comb-line spacing of the OFC and the
free spectral range (FSR) of the FPF.
A novel microwave photonic channelized receiver and multi-band frequency conversion system based on optical frequency comb (OFC) is proposed and demonstrated. In the proposed scheme, the RF signal is modulated by a polarization modulator to generate 6-line OFC on the upper branch, and the microwave signal is modulated by the polarization modulator to generate ±st order sidebands on the lower branch. The upper and lower signals are coupled by an optical coupler and channelized by a wavelength division multiplexer to realize instantaneous frequency measurement and multi-band frequency conversion of microwave signals. The result shows that microwave signals from 0GHz to 29GHz can be measured by adjusting the comb spacing to 10GHz. When the microwave signal is 22GHz, the frequency conversion of microwave signal can also be completed by this system after the completion of frequency measurement, and it can be down-converted to 1.98GHz (L band), 8.05GHz (X band), 18.05GHz (K band) and can be up-converted to 28.05GHz (Ka band), 38.05GHz (Ka band), 48.05GHz (U band).
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