We report a 3.75-Gb/s visible light communication （VLC） system thatusessingle-carrier frequency-domain equalization （SC-FDE） based on a single red--green-blue （RGB） light-emitting diode （LED）, with tim measure...We report a 3.75-Gb/s visible light communication （VLC） system thatusessingle-carrier frequency-domain equalization （SC-FDE） based on a single red--green-blue （RGB） light-emitting diode （LED）, with tim measured bit error rates （BERs） under a pre-forward-error-correction threshold of 3.8 × 10-3. The fun- damental characteristics of an RGB-LED-based VLC system are measured. We also compare SC-FDE with OFDM in terms of peak-to-average power ratio and BER performance, which shows that SC-FDE outperforms the OFDM modulation scheme.展开更多
Due to its strong piezoelectric effect and photo-elastic property, lithium niobate is widely used for acousto-optical applications. However, conventional bulk lithium niobate waveguide devices exhibit a large footprin...Due to its strong piezoelectric effect and photo-elastic property, lithium niobate is widely used for acousto-optical applications. However, conventional bulk lithium niobate waveguide devices exhibit a large footprint and limited light–sound interaction resulting from the weak guiding of light. Here, we report the first acousto-optical modulators with surface acoustic wave generation, phononic cavity, and low-loss photonic waveguide devices monolithically integrated on a 500 nm thick film of lithium niobate on an insulator. Modulation efficiency was optimized by properly arranging the propagation directions of surface acoustic waves and optical guided modes.The effective photo-elastic coefficient extracted by comparing the first and third harmonic modulation signals from an on-chip Mach–Zehnder interferometer indicates the excellent acousto-optical properties of lithium niobate are preserved in the thin film implementation. Such material property finding is of crucial importance in designing various types of acousto-optical devices. Much stronger amplitude modulation was achieved in a high Q(>300,000) optical resonator due to the higher optical sensitivity. Our results pave the path for developing novel acousto-optical devices using thin film lithium niobate.展开更多
基金supported by the National Natural Science Fundation of China(No.61177071)the NHTRDP of China(No.2013AA013603)the Key Program of Shanghai Science and Technology Commission(No12dz1143000)
文摘We report a 3.75-Gb/s visible light communication （VLC） system thatusessingle-carrier frequency-domain equalization （SC-FDE） based on a single red--green-blue （RGB） light-emitting diode （LED）, with tim measured bit error rates （BERs） under a pre-forward-error-correction threshold of 3.8 × 10-3. The fun- damental characteristics of an RGB-LED-based VLC system are measured. We also compare SC-FDE with OFDM in terms of peak-to-average power ratio and BER performance, which shows that SC-FDE outperforms the OFDM modulation scheme.
基金Defense Advanced Research Projects Agency(DARPA)(N66001-16-1-4025)
文摘Due to its strong piezoelectric effect and photo-elastic property, lithium niobate is widely used for acousto-optical applications. However, conventional bulk lithium niobate waveguide devices exhibit a large footprint and limited light–sound interaction resulting from the weak guiding of light. Here, we report the first acousto-optical modulators with surface acoustic wave generation, phononic cavity, and low-loss photonic waveguide devices monolithically integrated on a 500 nm thick film of lithium niobate on an insulator. Modulation efficiency was optimized by properly arranging the propagation directions of surface acoustic waves and optical guided modes.The effective photo-elastic coefficient extracted by comparing the first and third harmonic modulation signals from an on-chip Mach–Zehnder interferometer indicates the excellent acousto-optical properties of lithium niobate are preserved in the thin film implementation. Such material property finding is of crucial importance in designing various types of acousto-optical devices. Much stronger amplitude modulation was achieved in a high Q(>300,000) optical resonator due to the higher optical sensitivity. Our results pave the path for developing novel acousto-optical devices using thin film lithium niobate.
