16 September 2014 Variable-chirped microwave waveform generator based on reconfigurable microwave photonic filter
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An optical approach to generating chirped microwave signal using a photonic microwave delay-line filter (PMDLF) with a quadratic phase response is proposed and demonstrated. In this scheme, a narrow band Gaussian pulse is used as the original signal. In order to eliminate the need for a wideband original microwave chirped-free signal, a mixer and a radio frequency signal are used to up-convert the spectrum of the original signal and the dispersion curve is tuned to minimize the attenuation caused by the fiber dispersion. Then the required frequency response can be reconstructed by a nonuniformly spaced PMDLF. Since the majority of the power of the original signal can bypass the filter, the power of the generated chirped microwave signal will be increased. A reconstruction example of a desired frequency response with a central frequency of 10 GHz is provided, and the generation of the corresponding chirped microwave signal is demonstrated by numerical simulations.
© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
Dalei Chen, Dalei Chen, Rong Wang, Rong Wang, Tao Pu, Tao Pu, Tao Fang, Tao Fang, Peng Xiang, Peng Xiang, Jiling Zheng, Jiling Zheng, Zhihu Wei, Zhihu Wei, Jintian Xiong, Jintian Xiong, } "Variable-chirped microwave waveform generator based on reconfigurable microwave photonic filter," Optical Engineering 53(9), 095106 (16 September 2014). https://doi.org/10.1117/1.OE.53.9.095106 . Submission:

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