High-speed visible light communication(VLC)using light-emitting diodes(LEDs)is a potential complementary technology for beyond-5 G wireless communication networks.The speed of VLC systems significantly depends on the ...High-speed visible light communication(VLC)using light-emitting diodes(LEDs)is a potential complementary technology for beyond-5 G wireless communication networks.The speed of VLC systems significantly depends on the quality of LEDs,and thus various novel LEDs with enhanced VLC performance increasingly emerge.Among them,In Ga N/Ga N-based LEDs on a Si-substrate are a promising LED transmitter that has enabled VLC data rates beyond 10 Gbps.The optimization on the period number of superlattice interlayer(SL),which is a stressrelief epitaxial layer in a Si-substrate LED,has been demonstrated to be an effective method to improve Si-substrate LED’s luminescence properties.However,this method to improve LED’s VLC properties is barely investigated.Hence,we for the first time experimentally studied the impact of SL period number on VLC performance.Accordingly,we designed and fabricated an integrated 4×4 multichromatic Si-substrate wavelength-divisionmultiplexing LED array chip with optimal SL period number.This chip allows up to 24.25 Gbps/1.2 m VLC transmission using eight wavelengths,which is the highest VLC data rate for an In Ga N/Ga N LED-based VLC system to the best of our knowledge.Additionally,a record-breaking data rate of 2.02 Gbps over a 20-m VLC link is achieved using a blue Si-substrate LED with the optimal SL period number.These results validate the effectiveness of Si-substrate LEDs for both high-speed and long-distance VLC and pave the way for Si-substrate LED design specially for high-speed VLC applications.展开更多
High-speed visible light communication(VLC),as a cutting-edge supplementary solution in 6G to traditional radio-frequency communication,is expected to address the tension between continuously increased demand of capac...High-speed visible light communication(VLC),as a cutting-edge supplementary solution in 6G to traditional radio-frequency communication,is expected to address the tension between continuously increased demand of capacity and currently limited supply of radio-frequency spectrum resource.The main driver behind the high-speed VLC is the presence of light emitting diode(LED)which not only offers energy-efficient lighting,but also provides a cost-efficient alternative to the VLC transmitter with superior modulation potential.Particularly,the InGaN/GaN LED grown on Si substrate is a promising VLC transmitter to simultaneously realize effective communication and illumination by virtue of beyond 10-Gbps communication capacity and Watt-level output optical power.In previous parameter optimization of Si-substrate LED,the superlattice interlayer(SL),especially its period number,is reported to be the key factor to improve the lighting performance by enhancing the wall-plug efficiency,but few efforts were made to investigate the influence of SLs on VLC performance.Therefore,to optimize the VLC performance of Si-substrate LEDs,we for the first time investigated the impact of the SL period number on VLC system through experiments and theoretical derivation.The results show that more SL period number is related to higher signal-to-noise ratio(SNR)via improving the wall-plug efficiency.In addition,by using Levin-Campello bit and power loading technology,we achieved a record-breaking data rate of 3.37 Gbps over 1.2-m free-space VLC link under given optimal SL period number,which,to the best of our knowledge,is the highest data rate for a Si-substrate LED-based VLC system.展开更多
基金National Natural Science Foundation of China(61925104,62031011)Fudan University-CIOMP Joint Fund。
文摘High-speed visible light communication(VLC)using light-emitting diodes(LEDs)is a potential complementary technology for beyond-5 G wireless communication networks.The speed of VLC systems significantly depends on the quality of LEDs,and thus various novel LEDs with enhanced VLC performance increasingly emerge.Among them,In Ga N/Ga N-based LEDs on a Si-substrate are a promising LED transmitter that has enabled VLC data rates beyond 10 Gbps.The optimization on the period number of superlattice interlayer(SL),which is a stressrelief epitaxial layer in a Si-substrate LED,has been demonstrated to be an effective method to improve Si-substrate LED’s luminescence properties.However,this method to improve LED’s VLC properties is barely investigated.Hence,we for the first time experimentally studied the impact of SL period number on VLC performance.Accordingly,we designed and fabricated an integrated 4×4 multichromatic Si-substrate wavelength-divisionmultiplexing LED array chip with optimal SL period number.This chip allows up to 24.25 Gbps/1.2 m VLC transmission using eight wavelengths,which is the highest VLC data rate for an In Ga N/Ga N LED-based VLC system to the best of our knowledge.Additionally,a record-breaking data rate of 2.02 Gbps over a 20-m VLC link is achieved using a blue Si-substrate LED with the optimal SL period number.These results validate the effectiveness of Si-substrate LEDs for both high-speed and long-distance VLC and pave the way for Si-substrate LED design specially for high-speed VLC applications.
基金supported by the NSFC project(No.61925104,No.62031011)Peng Cheng Laboratory project(No.PCL2021A14)and Fudan University-CIOMP Joint Fund.
文摘High-speed visible light communication(VLC),as a cutting-edge supplementary solution in 6G to traditional radio-frequency communication,is expected to address the tension between continuously increased demand of capacity and currently limited supply of radio-frequency spectrum resource.The main driver behind the high-speed VLC is the presence of light emitting diode(LED)which not only offers energy-efficient lighting,but also provides a cost-efficient alternative to the VLC transmitter with superior modulation potential.Particularly,the InGaN/GaN LED grown on Si substrate is a promising VLC transmitter to simultaneously realize effective communication and illumination by virtue of beyond 10-Gbps communication capacity and Watt-level output optical power.In previous parameter optimization of Si-substrate LED,the superlattice interlayer(SL),especially its period number,is reported to be the key factor to improve the lighting performance by enhancing the wall-plug efficiency,but few efforts were made to investigate the influence of SLs on VLC performance.Therefore,to optimize the VLC performance of Si-substrate LEDs,we for the first time investigated the impact of the SL period number on VLC system through experiments and theoretical derivation.The results show that more SL period number is related to higher signal-to-noise ratio(SNR)via improving the wall-plug efficiency.In addition,by using Levin-Campello bit and power loading technology,we achieved a record-breaking data rate of 3.37 Gbps over 1.2-m free-space VLC link under given optimal SL period number,which,to the best of our knowledge,is the highest data rate for a Si-substrate LED-based VLC system.
