Delay jitter and dispersion are two important factors that impact the quality of radio over fiber transmission. In this paper, a simultaneous perception method for these two factors based on matched filtering is proposed. The proposed method effectively combines the precision of RF matched filtering process with the broadband advantages of microwave photonics technology, which can enable an accurate perception of both. The effectiveness of the proposed perception method is verified through experiments.
A photonic approach to generate dual-chirp microwave waveform based on an improved optical frequency operation module (OFOM) is proposed and experimentally demonstrated. Without altering the existing OFOM architecture and only by expanding optical filtering and setting appropriate input radio-frequency (RF) signal parameters, two optical sidebands with opposite chirp characteristics will overlap in the frequency domain. After photodetection, a dual-chirp microwave waveform with tunable central frequency and multiplying bandwidth can be generated. Experimentally, dual-chirp signals at 13.2GHz with a tunable bandwidth from 60 MHz to 6 GHz are generated. The pulse compression ratio (PCR) and the peak-to-sidelobe ratio (PSR) of the generated signals are evaluated. In addition, the tunability of the central frequency is also investigated, which verifies the feasibility of the proposed scheme.
A microwave photonic (MWP) pulse radar system for high-resolution target detection is proposed and experimentally demonstrated in this article. In the transmitter, a pulsed linearly-frequency-modulated (LFM) wave is generated based on optical frequency operation module (OFOM), which can generate LFM waves with ultra-flexibly tunable center frequency. In the receiver, optical-domain down-conversion is employed to convert the incoming echo to an intermediate frequency signal by a microwave photonic frequency mixer, which can free the receiver from high-speed ADC and provide an excellent wideband processing. Experimentally, a Ku-band pulsed LFM wave with a bandwidth of 840 MHz is generated and received through self-closed-loop and target detection test by the constructed system. The performance verifies that the proposed pulsed MWP radar has the potential of supporting high-resolution detection and recognition of distant targets.
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