A Photonics-enabled Compressed Sensing (PCS) system for sparse Radio Frequency (RF) signals acquiring is proposed and experimentally validated, utilizing an optical pulse stretching and compression structure. A pulse train is first stretched by a dispersion module to carry the signal under measurement and a bipolar Pseudo-Random Binary Sequence (PRBS), then the pulse is compressed by another complementary dispersion module to perform integration process. The measurement matrix can be directly obtained from the envelope of the stretched pulse, avoiding the necessity of accurately obtaining the link impulse response including the Low-Pass Filter (LPF) in the traditional systems. A preliminary proof-of-concept experiment has been successfully carried out. A two-tone signal with frequencies of 400MHz and 800MHz is successfully reconstructed using a sampling rate of 100MHz, which is 1/16th of the Nyquist rate of the input two-tone signal.
A novel method to perform high-resolution and wideband optical vector analysis (OVA) by using fixed low-frequency detection is proposed and demonstrated. In the proposed OVA, an optical superheterodyne structure is employed to down-convert the frequency-sweeping probe signal into a fixed low-frequency photocurrent. An electrical low-speed and high-sensitivity receiver is used to extract the complex amplitude of the photocurrent accurately, which can improve the sensitivity and dynamic range of the measurement system. Besides, by using the asymmetrical double-sideband modulation (AODSB), the measurable frequency range will be expanded to twice the bandwidth of the electro-optic modulator and microwave synthesizer. Moreover, the high-speed photodetector and wideband phase-magnitude detector are omitted, which can greatly reduce the hardware cost. In an experiment, the electrical receiver works at 199 MHz and 201 MHz, respectively. The measurement range is 80 GHz, and the resolution is 200 kHz.
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