S. Shi
20 Papers
4 Citations
S. Shi is an academic researcher. The author has contributed to research in topics: Computer science & Photonics. The author has an hindex of 3, co-authored 10 publications.
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Papers
Tunable bandpass microwave photonic filter with largely reconfigurable bandwidth and steep shape factor based on cascaded silicon nitride micro-ring resonators
Cheng Wei,Dongdong Lin,Pengfei Wang,S. Shi,Mengjia Lu,Chenxi Guo,Yifei Chen,Zhuang Tian,Guohua Hu,Binfeng Yun +9 more
Abstract: Bandpass microwave photonic filter (MPF) can be achieved based on the well-known phase to intensity conversion method by using phase modulation and single micro-ring resonator (MRR) notch filter. Since MRR could introduce residual phase in handling one optical sideband, the out-of-band radio frequency (RF) rejection ratio and the shape factor of the bandpass MPF are very limited. Here, by introducing another MRR to handle the other optical sideband, the residual phase can be greatly suppressed, thus the filter's performance can be greatly improved. The proposed bandpass MPF was both verified theoretically and experimentally. Compared with the single MRR, the out-of-band RF rejection ratio and the shape factor were improved by 20 dB and 1.67, respectively. Furthermore, the bandpass MPF's bandwidth is reconfigurable by adjusting the optical carrier's frequency or the two MRRs' amplitude coupling coefficients. The bandpass MPF's center frequency is also tunable by changing the resonant wavelengths of two MRRs in the opposite direction simultaneously. Experimentally, bandwidth reconfiguration from 0.38 GHz to 15.74 GHz, the shape factor optimization from 2 to 1.23, and frequency tuning from 4 GHz to 21.5 GHz were achieved. We believe that the proposed bandpass MPF has great potential for microwave photonic signal processing.
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Low loss silicon nitride 1×4 microwave photonic beamforming chip.
Dongdong Lin,S. Shi,Pengcheng Liu,Wei Chen,Mengjia Lu,T. Lin,Guohua Hu,Binfeng Yun,Yiping Cui +8 more
TL;DR: In this paper , an ultra-low loss 1×4 microwave photonic beamforming chip was designed and fabricated based on the low loss double strip silicon nitride platform, which contains a 1 ×4 beam splitter and four 5-bit optical delay lines.
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Tunable microwave frequency comb generation using a Si3N4-MDR based actively mode-locked OEO.
Pengcheng Liu,S. Shi,Mengjia Lu,Dongdong Lin,Wei Chen,T. Lin,Guohua Hu,Binfeng Yun,Yiping Cui +8 more
TL;DR: In this paper , a low-frequency electrical signal was injected into a tunable optoelectronic oscillator (OEO) to tune the MFC's center frequency and comb spacing.
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Improving Performance of Silicon Thermo-Optic Switch by Combing Spiral Phase Shifter and Optimized Pulse Driving
Dongdong Lin,Wei Chen,S. Shi,Pengcheng Liu,Mengjia Lu,T. Lin,Guohua Hu,Yun Binfeng,Yiping Cui +8 more
TL;DR: In this article , the authors designed and fabricated a silicon thermo-optic switch with spiral optical phase shifters, which can reduce the switching power from 21.5 mW to 8.73 mW.
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