We proposed two kinds of visible light communication(VLC)systems which respectively based on 64QAM/square geometrical shaping(SGS)128QAM time domain hybrid modulation scheme(SGSHY)and 64QAM/128QAM time domain hybrid m...We proposed two kinds of visible light communication(VLC)systems which respectively based on 64QAM/square geometrical shaping(SGS)128QAM time domain hybrid modulation scheme(SGSHY)and 64QAM/128QAM time domain hybrid modulation scheme(REGHY).These two systems can operate around specific forward error correction(FEC)threshold and maximize the achievable information rate(AIR)of the system.The principles of SGSHY and REGHY are proposed in detail,which has very low computation complexity compared with probabilistic shaping.The SGSHY outperforms REGHY at high peak to peak voltage(Vpp).Experimental results show that at high Vpp like 1.4V,which means the system is suffering from high nonlinear distortion,the AIR of SGSHY outperforms that of REGHY by 0.12Gb/s at the 2×10-2 FEC threshold.The AIR of the REGHY is at most 0.36Gb/s higher than that of 64QAM at 0.8V Vpp and 7%FEC threshold,while the(achievable information rate)AIR of SGSHY is at most 0.40Gb/s higher than that of 64QAM at 1.4V Vpp and 20%FEC threshold.展开更多
Visible-light communication(VLC)stands as a promising component of the future communication network by providing high-capacity,low-latency,and high-security wireless communication.Superluminescent diode(SLD)is propose...Visible-light communication(VLC)stands as a promising component of the future communication network by providing high-capacity,low-latency,and high-security wireless communication.Superluminescent diode(SLD)is proposed as a new light emitter in the VLC system due to its properties of droop-free emission,high optical power density,and low speckle-noise.In this paper,we analyze a VLC system based on SLD,demonstrating effective implementation of carrierless amplitude and phase modulation(CAP).We create a low-complexity memory-polynomial-aided neural network(MPANN)to replace the traditional finite impulse response(FIR)post-equalization filters of CAP,leading to significant mitigation of the linear and nonlinear distortion of the VLC channel.The MPANN shows a gain in Q factor of up to 2.7 dB higher than other equalizers,and more than four times lower complexity than a standard deep neural network(DNN),hence,the proposed MPANN opens a pathway for the next generation of robust and efficient neural network equalizers in VLC.We experimentally demonstrate a proof-of-concept 2.95-Gbit/s transmission using MPANN-aided CAP with 16-quadrature amplitude modulation(16-QAM)through a 30-cm channel based on the 442-nm blue SLD emitter.展开更多
The rapid rise of artificial intelligence(AI)has catalyzed advancements across various trades and professions.Developing large-scale AI models is now widely regarded as one of the most viable approaches to achieving g...The rapid rise of artificial intelligence(AI)has catalyzed advancements across various trades and professions.Developing large-scale AI models is now widely regarded as one of the most viable approaches to achieving general-purpose intelligent agents.This pressing demand has made the development of more advanced computing accelerators an enduring goal for the rapid realization of large-scale AI models.However,as transistor scaling approaches physical limits,traditional digital electronic accelerators based on the von Neumann architecture face significant bottlenecks in energy consumption and latency.Optical computing accelerators,leveraging the high bandwidth,low latency,low heat dissipation,and high parallelism of optical devices and transmission over waveguides or free space,offer promising potential to overcome these challenges.In this paper,inspired by the generic architectures of digital electronic accelerators,we conduct a bottom-up review of the principles and applications of optical computing accelerators based on the basic element of computing accelerators–the multiply-accumulate(MAC)unit.Then,we describe how to solve matrix multiplication by composing calculator arrays from different MAC units in diverse architectures,followed by a discussion on the two main applications where optical computing accelerators are reported to have advantages over electronic computing.Finally,the challenges of optical computing and our perspective on its future development are presented.Moreover,we also survey the current state of optical computing in the industry and provide insights into the future commercialization of optical computing.展开更多
Visible light communication based on light-emitting diodes(LEDs) has become a promising candidate by providing high data rates, low latency, and secure communication for underwater environments. In this paper,a self-d...Visible light communication based on light-emitting diodes(LEDs) has become a promising candidate by providing high data rates, low latency, and secure communication for underwater environments. In this paper,a self-designed common-anode GaN-based five-primary-color LED(RGBYC LED) on a Si substrate is proposed and fabricated. The design of a common anode is used to mitigate the saturation effect for a low-frequency component. Additionally, compared with commercially available LEDs that suffer from nonlinearity distortion,applying the designed LED can provide much better and broader linearity according to the measurement results.Therefore, the modulation depth and system performance can be further improved to implement a high-speed underwater visible light communication(UVLC) system. There is no nonlinearity compensation algorithm applied due to the good linearity of the proposed LED;thus, the offline digital signal processing is simplified. We experimentally demonstrate 14.81 Gbit/s 64 quadrature amplitude modulation(QAM)-discrete multitone(DMT)and 15.17 Gbit/s bit-loading-DMT transmissions through a 1.2-m-long underwater channel based on the proposed RGBYC LED with an intrasymbol frequency-domain averaging channel estimation and zero-forcing equalization.As far as we know, this is the highest data rate for an LED-based UVLC system.展开更多
Visible light communication(VLC) shows great potential in Internet of Vehicle applications. A single-input multi-output VLC system for Vehicle to Everything is proposed and demonstrated. A commercial car headlight is ...Visible light communication(VLC) shows great potential in Internet of Vehicle applications. A single-input multi-output VLC system for Vehicle to Everything is proposed and demonstrated. A commercial car headlight is used as transmitter. With a self-designed 2 × 2 positive-intrinsic-negative(PIN) array, four independent signals are received and equalized by deep-neural-network post-equalizers, respectively. Maximum-ratio combining brings high signal-to-noise ratio and data rate gain. The transmission data rate reaches 1.25 Gb/s at 1 m and exceeds 1 Gb/s at 4 m. To the best of our knowledge, it is the first-time demonstration of beyond 1 Gb/s employing a commercial car headlight.展开更多
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
Underwater visible light communication(UVLC)is expected to act as an alternative candidate in nextgeneration underwater 5G wireless optical communications.To realize high-speed UVLC,the challenge is the absorption,sca...Underwater visible light communication(UVLC)is expected to act as an alternative candidate in nextgeneration underwater 5G wireless optical communications.To realize high-speed UVLC,the challenge is the absorption,scattering,and turbulence of a water medium and the nonlinear response from imperfect optoelectronic devices that can bring large attenuations and a nonlinearity penalty.Nonlinear adaptive filters are commonly used in optical communication to compensate for nonlinearity.In this paper,we compare a recursive least square(RLS)-based Volterra filter,a least mean square(LMS)-based digital polynomial filter,and an LMS-based Volterra filter in terms of performance and computational complexity in underwater visible light communication.We experimentally demonstrate 2.325 Gb/s transmission through 1.2 m of water with a commercial blue light-emitting diode.Our goal is to assist the readers in refining the motivation,structure,performance,and cost of powerful nonlinear adaptive filters in the context of future underwater visible light communication in order to tap into hitherto unexplored applications and services.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
Visible light communication(VLC)is a promising research field in modern wireless communication.VLC has its irreplaceable strength including rich spectrum resources,no electromagnetic disturbance,and high-security guar...Visible light communication(VLC)is a promising research field in modern wireless communication.VLC has its irreplaceable strength including rich spectrum resources,no electromagnetic disturbance,and high-security guarantee.However,VLC systems suffer from the non-linear effects that exist in almost every part of the system.As a part of artificial intelligence,machine learning(ML)is showing its potential in non-linear mitigating for its natural ability to fit all kinds of transfer functions,which may dramatically push the research in VLC.This paper introduces the application of ML in VLC,describes five recent research of deep learning applications in VLC,and analyses the performance.展开更多
Chip-scale multi-dimensional multiplexing technology that combines wavelengths and spatial modes on a silicon photonic integrated circuit(PIC)is highly promising for the link-capacity scaling of future optical interco...Chip-scale multi-dimensional multiplexing technology that combines wavelengths and spatial modes on a silicon photonic integrated circuit(PIC)is highly promising for the link-capacity scaling of future optical interconnects.However,current multi-dimensional multiplexed PICs face significant challenges in simultaneously achieving broad optical bandwidth,low mode crosstalk,and dual-polarization modes in an ultra-compact footprint as the number of spatial modes increases.To address the issue,a topology-optimization-based inverse design assisted by a novel manufacturing calibration method(MCM)is utilized.Based on a 220 nm silicon-on-insulator(SOI)platform,a 100 nm broadband and ultra-compact(6μm×6μm)multi-dimensional multiplexed PIC supporting TE_(0),TE_(1),TM_(0),and TM_(1)modes with modes crosstalk<−16 dB ranging from 1500 to 1600 nm is demonstrated for the first time,to the best of our knowledge.Furthermore,the PIC is implemented to experimentally enable a single-wavelength 4-modes×100 Gbit=s PAM-4 direct modulation data transmission over 51 wavelengths with 0.8 nm channel spacing.This work shows the potential of utilizing multi-dimensional multiplexed PICs as optical interconnects to effectively address the speed limits of data transfer for future high-performance chip-to-chip interconnection.展开更多
Optical interconnects based on photonic integrated circuits(PICs)are emerging as a pivotal technology to address the relentless surge in data traffic driven by compute-intensive applications.Combining mode-division mu...Optical interconnects based on photonic integrated circuits(PICs)are emerging as a pivotal technology to address the relentless surge in data traffic driven by compute-intensive applications.Combining mode-division multiplexing(MDM)with wavelength-division multiplexing(WDM)offers a compelling approach to significantly enhance the shoreline density of optical interconnects.However,existing on-chip MDM systems encounter considerable challenges in simultaneously achieving a large optical bandwidth,multi-band operation,and ultra-compactness,thereby limiting scalability as conventional telecom band resources become increasingly constrained.Here we introduce,to our knowledge,the first inverse-designed multi-band mode multiplexer(MUX)utilizing a digital metamaterial structure to support the first three-order TE modes.The proposed device features an ultra-compact footprint of 6μm×4.8μm and exhibits an exceptionally flat spectral response,with numerical simulations confirming spectral variations of less than 0.94 dB across the 1500–2100 nm range.Experimental results further validate its performance,demonstrating insertion losses below 4.3 dB and 4.0 dB,and crosstalk below−11.6 dB and−11.3 dB,within the 1525–1585 nm and 1940–2040 nm bands,respectively.Additionally,system-level optical interconnect experiments using a multi-band MDM circuit successfully achieve single-wavelength transmission rates of 3-modes×180 Gb∕s at the 1.55μm band and record-setting 3-modes×114 Gb∕s in the 2μm band.This work highlights the transformative potential of employing multi-band MDM technology to enhance bandwidth density and scalability,providing a robust foundation for next-generation high-capacity on-chip optical interconnects.展开更多
With the rapid advancement of the information age,the demand for multi-dimensional light information detection has significantly increased.Traditional Fourier-transform infrared(FTIR)spectrometers and pooptical power,...With the rapid advancement of the information age,the demand for multi-dimensional light information detection has significantly increased.Traditional Fourier-transform infrared(FTIR)spectrometers and pooptical power,andlarimeters,due to their bulky structure,are no longer suitable for emerging fields such as medical diagnostics,secure communications,and autonomous driving.As a result,there is a pressing need to develop new miniaturized on-chip devices.The abundant two-dimensional(2D)materials,with their unique light-matter interactions,offer the potential to construct high-dimensional spatial mappings of incident light,paving the way for the development of novel ultra-compact multi-dimensional deep optical sensing technologies.Here,we review the interconnections of multi-dimensional information and their relationship with 2D materials.We then focus on recent advances in the development of novel dimensional detectors based on 2D materials,covering dimensions such as intensity,time,space,polarization,phase angle,and wavelength.Furthermore,we discuss cutting-edge technologies in multi-dimensional fusion detection and highlight future technological prospects,with a particular emphasis on on-chip integration and future development.展开更多
文摘We proposed two kinds of visible light communication(VLC)systems which respectively based on 64QAM/square geometrical shaping(SGS)128QAM time domain hybrid modulation scheme(SGSHY)and 64QAM/128QAM time domain hybrid modulation scheme(REGHY).These two systems can operate around specific forward error correction(FEC)threshold and maximize the achievable information rate(AIR)of the system.The principles of SGSHY and REGHY are proposed in detail,which has very low computation complexity compared with probabilistic shaping.The SGSHY outperforms REGHY at high peak to peak voltage(Vpp).Experimental results show that at high Vpp like 1.4V,which means the system is suffering from high nonlinear distortion,the AIR of SGSHY outperforms that of REGHY by 0.12Gb/s at the 2×10-2 FEC threshold.The AIR of the REGHY is at most 0.36Gb/s higher than that of 64QAM at 0.8V Vpp and 7%FEC threshold,while the(achievable information rate)AIR of SGSHY is at most 0.40Gb/s higher than that of 64QAM at 1.4V Vpp and 20%FEC threshold.
基金the National Key Research,Development Program of China(2017YFB0403603)the NSFC project(No.61925104).JAHL,YM,TKN and BSO gratefully acknowledge the financial support from King Abdullah University of Science and Technology(KAUST)through BAS/1/1614-01-01,REP/1/2878-01-01,GEN/1/6607-01-01,and KCR/1/2081-01-01the King Abdullah University of Science and Technology(KAUST)Office of Sponsored Research(OSR)under Award No.OSR-CRG2017-3417.JAHL further acknowledge access to the KAUST Nanofabrication Core Lab for the fabrication of devices.
文摘Visible-light communication(VLC)stands as a promising component of the future communication network by providing high-capacity,low-latency,and high-security wireless communication.Superluminescent diode(SLD)is proposed as a new light emitter in the VLC system due to its properties of droop-free emission,high optical power density,and low speckle-noise.In this paper,we analyze a VLC system based on SLD,demonstrating effective implementation of carrierless amplitude and phase modulation(CAP).We create a low-complexity memory-polynomial-aided neural network(MPANN)to replace the traditional finite impulse response(FIR)post-equalization filters of CAP,leading to significant mitigation of the linear and nonlinear distortion of the VLC channel.The MPANN shows a gain in Q factor of up to 2.7 dB higher than other equalizers,and more than four times lower complexity than a standard deep neural network(DNN),hence,the proposed MPANN opens a pathway for the next generation of robust and efficient neural network equalizers in VLC.We experimentally demonstrate a proof-of-concept 2.95-Gbit/s transmission using MPANN-aided CAP with 16-quadrature amplitude modulation(16-QAM)through a 30-cm channel based on the 442-nm blue SLD emitter.
基金supported by Shanghai Municipal Science and Technology Major Project.
文摘The rapid rise of artificial intelligence(AI)has catalyzed advancements across various trades and professions.Developing large-scale AI models is now widely regarded as one of the most viable approaches to achieving general-purpose intelligent agents.This pressing demand has made the development of more advanced computing accelerators an enduring goal for the rapid realization of large-scale AI models.However,as transistor scaling approaches physical limits,traditional digital electronic accelerators based on the von Neumann architecture face significant bottlenecks in energy consumption and latency.Optical computing accelerators,leveraging the high bandwidth,low latency,low heat dissipation,and high parallelism of optical devices and transmission over waveguides or free space,offer promising potential to overcome these challenges.In this paper,inspired by the generic architectures of digital electronic accelerators,we conduct a bottom-up review of the principles and applications of optical computing accelerators based on the basic element of computing accelerators–the multiply-accumulate(MAC)unit.Then,we describe how to solve matrix multiplication by composing calculator arrays from different MAC units in diverse architectures,followed by a discussion on the two main applications where optical computing accelerators are reported to have advantages over electronic computing.Finally,the challenges of optical computing and our perspective on its future development are presented.Moreover,we also survey the current state of optical computing in the industry and provide insights into the future commercialization of optical computing.
基金National Natural Science Foundation of China(NSFC)(61571133)National Key Research and Development Program of China(2016YFB0400600)
文摘Visible light communication based on light-emitting diodes(LEDs) has become a promising candidate by providing high data rates, low latency, and secure communication for underwater environments. In this paper,a self-designed common-anode GaN-based five-primary-color LED(RGBYC LED) on a Si substrate is proposed and fabricated. The design of a common anode is used to mitigate the saturation effect for a low-frequency component. Additionally, compared with commercially available LEDs that suffer from nonlinearity distortion,applying the designed LED can provide much better and broader linearity according to the measurement results.Therefore, the modulation depth and system performance can be further improved to implement a high-speed underwater visible light communication(UVLC) system. There is no nonlinearity compensation algorithm applied due to the good linearity of the proposed LED;thus, the offline digital signal processing is simplified. We experimentally demonstrate 14.81 Gbit/s 64 quadrature amplitude modulation(QAM)-discrete multitone(DMT)and 15.17 Gbit/s bit-loading-DMT transmissions through a 1.2-m-long underwater channel based on the proposed RGBYC LED with an intrasymbol frequency-domain averaging channel estimation and zero-forcing equalization.As far as we know, this is the highest data rate for an LED-based UVLC system.
基金partially supported by the National Key Research and Development Program of China(No. 2017YFB0403603)the National Natural Science Foundation of China (NSFC)(No. 61925104)the Visible Light Communication Technology Development Project by Huawei Company (No. YBN2019085097)。
文摘Visible light communication(VLC) shows great potential in Internet of Vehicle applications. A single-input multi-output VLC system for Vehicle to Everything is proposed and demonstrated. A commercial car headlight is used as transmitter. With a self-designed 2 × 2 positive-intrinsic-negative(PIN) array, four independent signals are received and equalized by deep-neural-network post-equalizers, respectively. Maximum-ratio combining brings high signal-to-noise ratio and data rate gain. The transmission data rate reaches 1.25 Gb/s at 1 m and exceeds 1 Gb/s at 4 m. To the best of our knowledge, it is the first-time demonstration of beyond 1 Gb/s employing a commercial car headlight.
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partially supported by the National Key Research and Development Program of China(No.2017YFB0403603)National Natural Science Foundation of China(NSFC)(No.61571133)Shanghai SHEITC Software and IC Industry Development Project(No.170326)
文摘Underwater visible light communication(UVLC)is expected to act as an alternative candidate in nextgeneration underwater 5G wireless optical communications.To realize high-speed UVLC,the challenge is the absorption,scattering,and turbulence of a water medium and the nonlinear response from imperfect optoelectronic devices that can bring large attenuations and a nonlinearity penalty.Nonlinear adaptive filters are commonly used in optical communication to compensate for nonlinearity.In this paper,we compare a recursive least square(RLS)-based Volterra filter,a least mean square(LMS)-based digital polynomial filter,and an LMS-based Volterra filter in terms of performance and computational complexity in underwater visible light communication.We experimentally demonstrate 2.325 Gb/s transmission through 1.2 m of water with a commercial blue light-emitting diode.Our goal is to assist the readers in refining the motivation,structure,performance,and cost of powerful nonlinear adaptive filters in the context of future underwater visible light communication in order to tap into hitherto unexplored applications and services.
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.
基金This work was partially supported by National Key Research and Development Program of China(2017YFB0403603)the NSFC project(No.61925104)。
文摘Visible light communication(VLC)is a promising research field in modern wireless communication.VLC has its irreplaceable strength including rich spectrum resources,no electromagnetic disturbance,and high-security guarantee.However,VLC systems suffer from the non-linear effects that exist in almost every part of the system.As a part of artificial intelligence,machine learning(ML)is showing its potential in non-linear mitigating for its natural ability to fit all kinds of transfer functions,which may dramatically push the research in VLC.This paper introduces the application of ML in VLC,describes five recent research of deep learning applications in VLC,and analyses the performance.
基金National Natural Science Foundation of China(61925104,62171137,62235005).
文摘Chip-scale multi-dimensional multiplexing technology that combines wavelengths and spatial modes on a silicon photonic integrated circuit(PIC)is highly promising for the link-capacity scaling of future optical interconnects.However,current multi-dimensional multiplexed PICs face significant challenges in simultaneously achieving broad optical bandwidth,low mode crosstalk,and dual-polarization modes in an ultra-compact footprint as the number of spatial modes increases.To address the issue,a topology-optimization-based inverse design assisted by a novel manufacturing calibration method(MCM)is utilized.Based on a 220 nm silicon-on-insulator(SOI)platform,a 100 nm broadband and ultra-compact(6μm×6μm)multi-dimensional multiplexed PIC supporting TE_(0),TE_(1),TM_(0),and TM_(1)modes with modes crosstalk<−16 dB ranging from 1500 to 1600 nm is demonstrated for the first time,to the best of our knowledge.Furthermore,the PIC is implemented to experimentally enable a single-wavelength 4-modes×100 Gbit=s PAM-4 direct modulation data transmission over 51 wavelengths with 0.8 nm channel spacing.This work shows the potential of utilizing multi-dimensional multiplexed PICs as optical interconnects to effectively address the speed limits of data transfer for future high-performance chip-to-chip interconnection.
基金National Key Research and Development Program of China(2023YFB2905700)National Natural Science Foundation of China(62235005,61925104,62171137).
文摘Optical interconnects based on photonic integrated circuits(PICs)are emerging as a pivotal technology to address the relentless surge in data traffic driven by compute-intensive applications.Combining mode-division multiplexing(MDM)with wavelength-division multiplexing(WDM)offers a compelling approach to significantly enhance the shoreline density of optical interconnects.However,existing on-chip MDM systems encounter considerable challenges in simultaneously achieving a large optical bandwidth,multi-band operation,and ultra-compactness,thereby limiting scalability as conventional telecom band resources become increasingly constrained.Here we introduce,to our knowledge,the first inverse-designed multi-band mode multiplexer(MUX)utilizing a digital metamaterial structure to support the first three-order TE modes.The proposed device features an ultra-compact footprint of 6μm×4.8μm and exhibits an exceptionally flat spectral response,with numerical simulations confirming spectral variations of less than 0.94 dB across the 1500–2100 nm range.Experimental results further validate its performance,demonstrating insertion losses below 4.3 dB and 4.0 dB,and crosstalk below−11.6 dB and−11.3 dB,within the 1525–1585 nm and 1940–2040 nm bands,respectively.Additionally,system-level optical interconnect experiments using a multi-band MDM circuit successfully achieve single-wavelength transmission rates of 3-modes×180 Gb∕s at the 1.55μm band and record-setting 3-modes×114 Gb∕s in the 2μm band.This work highlights the transformative potential of employing multi-band MDM technology to enhance bandwidth density and scalability,providing a robust foundation for next-generation high-capacity on-chip optical interconnects.
基金financial support from National Key Research and Development Program of China(Nos.2023YFB3611400,2024YFB2808200)National Natural Science Foundation of China(62450123,62375042,62475230)Sichuan Science and Technology Program(No.2024NSFSC1445).
文摘With the rapid advancement of the information age,the demand for multi-dimensional light information detection has significantly increased.Traditional Fourier-transform infrared(FTIR)spectrometers and pooptical power,andlarimeters,due to their bulky structure,are no longer suitable for emerging fields such as medical diagnostics,secure communications,and autonomous driving.As a result,there is a pressing need to develop new miniaturized on-chip devices.The abundant two-dimensional(2D)materials,with their unique light-matter interactions,offer the potential to construct high-dimensional spatial mappings of incident light,paving the way for the development of novel ultra-compact multi-dimensional deep optical sensing technologies.Here,we review the interconnections of multi-dimensional information and their relationship with 2D materials.We then focus on recent advances in the development of novel dimensional detectors based on 2D materials,covering dimensions such as intensity,time,space,polarization,phase angle,and wavelength.Furthermore,we discuss cutting-edge technologies in multi-dimensional fusion detection and highlight future technological prospects,with a particular emphasis on on-chip integration and future development.
