Tunable Single Bandpass Microwave Photonic Filter With an Improved Dynamic Range


A tunable single bandpass microwave photonic filter (MPF) with an improved spurious free dynamic range (SFDR) employing a dual-parallel Mach–Zehnder modulator (DP-MZM) and a section-shifted fiber Bragg grating (PS-FBG) is proposed and experimentally demonstrated. The DP-MZM is employed to come up with the same section-modulated (EPM) signal with an adjustable optical carrier to sideband ratio. The PS-FBG is used as an optical notch filter to get rid of one sideband of the EPM signal to convert the EPM signal to a single-sideband intensity-modulated signal. At the output of a photodetector, a microwave signal is detected. The entire operation is love one passband MPF. The tunability is achieved by tuning the wavelength the optical carrier. The SFDR of the MPF is improved due to the gain enhancement by a partial suppression of the optical carrier. An experiment is performed. One bandpass MPF with a passband width of 150 MHz and a frequency-tunable vary of $sim 5.five$ GHz with an improved SFDR by 11 dB is demonstrated.

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