We propose a cost-effective scheme relying exclusively on pilot symbols for robust frame synchronization and high-precision,wide-range carrier recovery in short-reach optical interconnects.Our method mitigates phase o...We propose a cost-effective scheme relying exclusively on pilot symbols for robust frame synchronization and high-precision,wide-range carrier recovery in short-reach optical interconnects.Our method mitigates phase offsets and enhances phase tracking by strategically placing dual-polarization pilot symbols,both aligned and misaligned,within the frame.Compared to traditional carrier recovery schemes,our approach offers a broader frequency offset estimation range,higher carrier recovery accuracy,and significantly lower computational complexity.Experimental results show a 0.7 dB sensitivity improvement at the soft decision forward error correction threshold,outperforming Fourier transform-based frequency offset estimation combined with blind phase search.展开更多
The heterogeneity of applications and their divergent resource requirements lead to uneven traffic distribution and imbalanced resource utilization across data center networks(DCNs).We propose a fine-grained baseband ...The heterogeneity of applications and their divergent resource requirements lead to uneven traffic distribution and imbalanced resource utilization across data center networks(DCNs).We propose a fine-grained baseband function reallocation scheme in heterogeneous optical switching-based DCNs.A deep reinforcement learning-based functional split and resource mapping approach(DRL-BFM)is proposed to maximize throughput in high-load server racks by implementing load balancing in DCNs.The results demonstrate that DRL-BFM improves the throughput by 20.8%,22.8%,and 29.8%on average compared to existing algorithms under different computational capacities,bandwidth constraints,and latency conditions,respectively.展开更多
Directly modulated vertical-cavity surface-emitting lasers(VCSELs) have long dominated the data center optical interconnect market, attributed to VCSELs' cost-effectiveness and energy efficiency. However, numerous...Directly modulated vertical-cavity surface-emitting lasers(VCSELs) have long dominated the data center optical interconnect market, attributed to VCSELs' cost-effectiveness and energy efficiency. However, numerous challenges are currently being addressed to enhance device characteristics and modulation speed, aligning with the evolving trends in nextgeneration data centers that underscore the need for enhanced communication rates and extended transmission distances. This review delves into VCSEL structure design, methods for achieving single-mode control, techniques for fabricating long-wavelength VCSELs, and advanced packaging technology for VCSEL arrays, offering insights into recent research on high-speed single-mode VCSEL development and related technologies.展开更多
We demonstrate the non-mechanical beam steering and amplifier operation of a vertical cavity surface emitting laser(VCSEL)integrated Bragg reflector waveguide amplifier with a cut-off wavelength detuning design,which ...We demonstrate the non-mechanical beam steering and amplifier operation of a vertical cavity surface emitting laser(VCSEL)integrated Bragg reflector waveguide amplifier with a cut-off wavelength detuning design,which enables unidirectional lateral coupling,continuous electrical beam steering,and diffraction-limited divergence angle.We present the modeling of the proposed structure for unidirectional coupling between a seed single-mode VCSEL and slow-light amplifier.We also present the detailed operating characteristics including the near-field and far-field patterns,light/current characteristics,and lasing spectrum.The experimental measurements exhibit a single-mode output of over 8 mW under CW operation,a continuous beam steering range of 16°,and beam divergence below 0.1°as an optical beam scanner.The integrated amplifier length is as small as 0.9 mm,and thus we could expect much higher powers and higher resolution points by increasing the amplifier lengths.展开更多
基金supported by the National Key R&D Program of China(No.2022YFB2903103)the National Natural Science Foundation of China(No.62205023)。
文摘We propose a cost-effective scheme relying exclusively on pilot symbols for robust frame synchronization and high-precision,wide-range carrier recovery in short-reach optical interconnects.Our method mitigates phase offsets and enhances phase tracking by strategically placing dual-polarization pilot symbols,both aligned and misaligned,within the frame.Compared to traditional carrier recovery schemes,our approach offers a broader frequency offset estimation range,higher carrier recovery accuracy,and significantly lower computational complexity.Experimental results show a 0.7 dB sensitivity improvement at the soft decision forward error correction threshold,outperforming Fourier transform-based frequency offset estimation combined with blind phase search.
基金supported by the National Key R&D Program of China(Nos.2023YFB2905500 and 2023YFB2805302)the National Natural Science Foundation of China(No.62205026)the Beijing Institute of Technology Research Fund Program for Young Scholars,and the Open Fund of IPOC(BUPT)。
文摘The heterogeneity of applications and their divergent resource requirements lead to uneven traffic distribution and imbalanced resource utilization across data center networks(DCNs).We propose a fine-grained baseband function reallocation scheme in heterogeneous optical switching-based DCNs.A deep reinforcement learning-based functional split and resource mapping approach(DRL-BFM)is proposed to maximize throughput in high-load server racks by implementing load balancing in DCNs.The results demonstrate that DRL-BFM improves the throughput by 20.8%,22.8%,and 29.8%on average compared to existing algorithms under different computational capacities,bandwidth constraints,and latency conditions,respectively.
基金supported by the National Natural Science Foundation of China (No.62205026)the Beijing Institute of Technology Research Fund Program for Young Scholars,and the Open Fund of IPOC (BUPT)。
文摘Directly modulated vertical-cavity surface-emitting lasers(VCSELs) have long dominated the data center optical interconnect market, attributed to VCSELs' cost-effectiveness and energy efficiency. However, numerous challenges are currently being addressed to enhance device characteristics and modulation speed, aligning with the evolving trends in nextgeneration data centers that underscore the need for enhanced communication rates and extended transmission distances. This review delves into VCSEL structure design, methods for achieving single-mode control, techniques for fabricating long-wavelength VCSELs, and advanced packaging technology for VCSEL arrays, offering insights into recent research on high-speed single-mode VCSEL development and related technologies.
文摘We demonstrate the non-mechanical beam steering and amplifier operation of a vertical cavity surface emitting laser(VCSEL)integrated Bragg reflector waveguide amplifier with a cut-off wavelength detuning design,which enables unidirectional lateral coupling,continuous electrical beam steering,and diffraction-limited divergence angle.We present the modeling of the proposed structure for unidirectional coupling between a seed single-mode VCSEL and slow-light amplifier.We also present the detailed operating characteristics including the near-field and far-field patterns,light/current characteristics,and lasing spectrum.The experimental measurements exhibit a single-mode output of over 8 mW under CW operation,a continuous beam steering range of 16°,and beam divergence below 0.1°as an optical beam scanner.The integrated amplifier length is as small as 0.9 mm,and thus we could expect much higher powers and higher resolution points by increasing the amplifier lengths.
