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In this paper, we analyze the nonlinearity in the photonic time stretch (PTS) system and present exact expressions for the intermodulation products and harmonics at the system output. Based on the nonlinearity analysis of the PTS system, the spurious-free dynamic range of the PTS system is also investigated.
Compressive sensing (CS) is a novel technology to realize sub-Nyquist sampling for measuring of sparse signals. Due to the advantages of high bandwidth offered by photonics, realization of compressive sensing in a photonic link is of great interest. In this paper, we discussed the limitations of CS in a conventional photonic link A potential solution is proposed. To further reduce sampling rate, we...
In this paper, a microwave spectrum sensing system based on photonic time stretch with large stretch factor beyond 80 is designed and experimentally demonstrated. A 10 GHz input signal is turned into a 122 MHz signal after stretching and the signal spectrum is successfully reconstructed by a DSP. The mean square error for spectrum sensing of X-band microwave signal in the experiment is measured to...
An approach to realizing photonic analog-to-digital conversion based on photonic time stretch and compressive sensing (CS) technique is proposed. A multi-tone signal (spectrally sparse) within a 20 GHz bandwidth is investigated. The wideband signal is firstly stretched in the time domain by a photonic time-stretcher and then reconstructed by CS based on random demodulator (RD). The random mixing in...
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