Abstract

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 $\pm {0.5}\;{\rm GHz}$. 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.

© 2022 Optica Publishing Group

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