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We demonstrate that by inserting bi-layer graphene inside silicon waveguide, the modulation ability of the overall waveguide can be greatly enhanced. A Mach-Zehnder modulator based on this structure is proposed and the calculated results show the modulator exhibits an excellent performance in terms of small footprint (35 μm2) and high extinction ration (31 dB). Besides, it requires low applied voltage...
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.
An approach to realizing wideband analog-to-digital conversion based on the techniques of photonic time stretch (PTS) and compressive sensing (CS) is proposed. In the system, a multitone signal within a wide bandwidth (spectrally sparse) signal is slowed down in the time domain by a photonic time stretcher. The stretched signal is then down-sampled and reconstructed by a random-demodulator-based CS...
Bias control of Mach-Zehnder electro-optic modulator is important for the performance of radio-over-fiber links. In this paper, a digital controller has been developed in order to keep the bias point at any target value, making the modulator exhibiting great long-term stability. Furthermore, this method was applied in radio-over-fiber links to optimize their performance, such as RF gain, noise figure,...
A simple and low-cost method for improving RF performance in phase modulation radio-over-fiber (RoF) systems by using stimulated Brillouin scattering (SBS) is proposed and demonstrated. We present a simple analytical model to assess the relationship between performance improvement of the phase-modulation RoF link and the carrier suppression ratio x. The experiment results show good agreement with...
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