- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2018 20th International Conference on Transparent Optical Networks (ICTON) - Bucharest (2018.7.1-2018.7.5)] 2018 20th International Conference on Transparent Optical Networks (ICTON) - Wavelength and Space Division Packet Super-Channel Switching System for Future Data Center Optical Networks with a Switching Capacity of 53.3 Tb/s/port
摘要： Data center (DC) traffic is expected to grow at a staggering annual rate over the next years. However, current DC networks, making use of point-to-point optical links and electronical switching systems, may be unable to meet this traffic demand with a reasonable energy consumption. Moreover, DC network traffic, characterized by dense matrices and bursty hot-spots, constitutes an additional challenge for DC networks designers. To address the capacity and energy bottlenecks and meet the traffic demands in future DC networks, this paper proposes a novel high-capacity optical switching system that employs time division multiplexing (TDM), wavelength division multiplexing (WDM), and space division multiplexing (SDM) to realize coherently modulated packet spatial super-channels (pSSCs). This optical switching system is based on three newly developed core-joint switching subsystems: an electro-absorption (EA)-based joint switch with ns switching speed, an acousto optical modulator (AOM)-based joint switch with μs switching speed, and a free-space mirror-based joint switch with ms switching speed. These switching subsystems are used in a network testbed to experimentally demonstrate a 2×2 switching node with 64 wavelength channels, 7-core pSSCs modulated at 32 GBd. The results confirm a record switching capacity of 53.3 Tb/s/port and network protection in case of a multi-core fiber (MFC) failure in less than 10 ms.
关键词： spatial division multiplexing,spatial switching,data center networking,coherent optical switching
更新于2025-09-23 15:22:29
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Performance-Aware Energy Saving for Data Center Networks
摘要： Today’s data center networks (DCNs) tend to have tens to hundreds of thousands of servers to provide massive and sophisticated services. The architectural design of DCNs usually over-provisioned for peaks workloads and fault-tolerance. Statistically, DCNs remain highly under-utilized with typical utilization of around 30%. Network over-provisioning and under-utilization can be exploited for energy-saving. Most research efforts on data center network energy saving focus on how to save maximum energy with little or no consideration to the performance of the residual network. Thus, the DCN performance degraded and the network left vulnerable to sudden traffic surges. In this paper, we have studied energy-saving problem in DCNs while preserving network performance. The problem was formulated as MILP that is solvable by CPLEX to minimize the energy consumed by DCN, meanwhile, safety threshold constraints for links utilization are met. To overcome CPLEX high computational time, a heuristic algorithm to provide practical and efficient solution for the MILP is introduced. The heuristic algorithm uses switches grouping and links consolidation to switch the traffic to a small number of network devices and turn-off unused switches and links. Valiant load-balancing is used to distribute the loads over active links. Simulation experiments using synthetic and real packet traces were conducted to validate the heuristic in terms of energy consumption and network performance. The results show that the heuristic can save up to 45% of the network energy and improves the average imbalance-scores for links and switches by more than 50% with minimal effect on network performance.
关键词： Load Balancing,Energy Saving,Data Center Networks
更新于2025-09-23 15:22:29
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Converged Inter/Intradata Center Optical Network with Packet Super-channels and 83.33 Tb/s/port
摘要： We experimentally demonstrate a novel time-slotted, converged inter/intra data center optical network that employs multi-core fibers (MFCs), packet spatial super-channels (pSSCs) and core-joint optical switches. The fundamental switching subsystem is the high-granularity core-joint electro-absorption optical switch, based on an array of electro-absorption 1x4 switching gates with a switching time of approximately 10 ns, and able to jointly switch all the wavelength and spatial channels of the pSSCs simultaneously. Lower granularity core-joint switches may be used in the pSSC switching nodes for other tasks such as network protection or bypass. Previously, we experimentally demonstrated a 2x2 pSSC switching system with a capacity of 53.3 Tb/s/port in a testbed with pSSCs composed of 64 wavelength channels, 7 spatial channels and PDM-QPSK-modulated payloads. In this work, we enhance our testbed experimental setup to demonstrate a record switching capacity of 83.33 Tb/s/port with pSSCs composed of 64 wavelength channels, 8 spatial channels and PDM-8PSK-modulated payloads. We also demonstrate the transparency of the core-joint electro-absorption switch by comparing the new results with the previous PDM-QPSK results in terms of the error-vector magnitude.
关键词： spatial division multiplexing,time division multiplexing,spatial switching,Data center networking,coherent optical switching
更新于2025-09-23 15:21:21
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Multicore Multimode Fiber-A New Type of Fiber Using Coupled-Core Structures
摘要： A new type of multimode fiber, multicore multimode fiber (MCMMF), which uses coupled multicore structure is proposed. The fiber has a large number of single mode cores with optimized coupling to achieve high bandwidth. A theoretical model for analyzing the MCMMF is developed. The effect of fiber parameters, such as index contrast, core radius, and core spacing on the bandwidth is systematically studied. Numerical simulations show that the bandwidth of a MCMMF can be optimized by choosing correct ratio of core spacing to core radius for a given profile design. In addition, mode coupling among the super-modes can further increase the bandwidth due to the small spacing in effective indices in coupled core structures. A MCMMF with 165 cores is fabricated. High bandwidth of 8.4 GHz·km in the 850 nm window is achieved. Using this fiber and a VCSEL-based 25 Gb/s SR transceiver, error free transmission though 150 m fiber is demonstrated.
关键词： fiber characterization,fiber bandwidth,data center,multimode fiber,Coupled multicore fiber,fiber design,fiber fabrication
更新于2025-09-23 15:21:01
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Analog I/Q FIR Filter in 55-nm SiGe BiCMOS for 16-QAM Optical Communications at 112 Gb/s
摘要： We propose a novel implementation of a complex analog equalization filter for the compensation of frequency-dependent variations in coherent optical links. The analog compensation filter can be used in coherent-lite optical communication links where digital signal processing (DSP) is removed to limit the complexity and power consumption. In these links, the filter can compensate for electrical bandwidth limitations and distortion introduced by chromatic dispersion in the fiber. The complex filter is implemented by combining four distributed analog finite-impulse response (FIR) filters to obtain the necessary response. The filter delays are implemented using active delay cell structures to create a compact solution. The analog filter is implemented in a 55-nm BiCMOS technology and consumes 185-mW core power for five complex filter taps. Performance is evaluated using the S-parameter measurements, noise and linearity measurements, and real-time system experiments using 112-Gb/s 16-QAM-modulated signals.
关键词： multiple-input–multiple-output,compensation of dispersion (EDC),coherent,electronic,data center,Analog equalization,dispersion
更新于2025-09-23 15:21:01
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[IEEE 2019 International Conference on Optical MEMS and Nanophotonics (OMN) - Daejeon, Korea (South) (2019.7.28-2019.8.1)] 2019 International Conference on Optical MEMS and Nanophotonics (OMN) - Fast switching via frustrated total internal reflection in silicon photonics MEMS-actuated waveguides
摘要： We present a switching concept based on total internal reflection (TIR) and frustrated-TIR (F-TIR) using a MEMS movable waveguide fully compatible with silicon photonics technology. The switching element allows implementing large-scale photonic switches.
关键词： MEMS switch,silicon photonics,Optical Switching,data center networking
更新于2025-09-23 15:19:57
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[IEEE 2019 6th International Conference on Systems and Informatics (ICSAI) - Shanghai, China (2019.11.2-2019.11.4)] 2019 6th International Conference on Systems and Informatics (ICSAI) - Tunnel Section Extraction and Deformation Analysis Based on Mobile Laser Scanning
摘要： Being a key computing element in cloud data center, virtual machines should be able to migrate from one location to another to meet the requirements of the cloud users and the defined policies of the cloud computing system. The mobility is an important issue when a virtual machine migrates across IP subnets. This paper focuses on the mobility management in cloud computing systems, and proposes a mobility-oriented cloud data center network architecture based on the identity/locator decoupling method of the mobility-driven networks. In cloud data center network, a mobile node refers to a virtual machine, and the mobility behavior mainly refers to virtual machine migration. In the proposed architecture, a virtual machine could implement live migration between IP subnets without service interruption. The evaluation shows that the proposed scheme can solve mobility issues effectively in virtual machine migration among IP subnets.
关键词： mobility-driven networks (MDN),Virtual machine migration,mobility management,cloud data center network
更新于2025-09-23 15:19:57
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[IEEE 2019 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS) - Macau, China (2019.11.3-2019.11.8)] 2019 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS) - Robust UAV Position and Attitude Estimation using Multiple GNSS Receivers for Laser-based 3D Mapping
摘要： We demonstrate error-free 100-Gb/s optical packet switching with low power consumption by using a combination of a label processor and 8 × 8 broadcast-and-select (B&S) optical switch. To achieve energy-ef?cient label processing, an optical-trigger-pulse generator that consumes energy only for a very short duration is realized, whereas the optoelectronic serial-to-parallel converter used to interface the fast label bits to a slow CMOS processor has been improved to operate with a reduced trigger pulse energy of 0.35 pJ. Moreover, the electro-absorption-modulator-based B&S optical switch is signi?cantly enhanced by introducing a surface ground electrode for eliminating electrical crosstalk and integrated spot-size converters with easy fabrication process. The total power consumption of the full 8 × 8 optical packet switch is estimated to be as low as 27.3 W or 3.4 W/100-Gb/s port.
关键词： optical switches,Data center network,optical label processor,optical packet switching (OPS),optical circuit switching (OCS)
更新于2025-09-23 15:19:57
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[IEEE 2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII) - Berlin, Germany (2019.6.23-2019.6.27)] 2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII) - 3-D Thermal Radiation Sensors on Optical Fiber Tips Fabricated Using Ultrashort Laser Pulses
摘要： Energy consumed by network constitutes a significant portion of the total power budget in modern data centers. Thus, it is critical to understand the energy consumption and improve the power efficiency of data center networks (DCNs). In doing so, one straightforward and effective way is to make the size of DCNs elastic along with traffic demands, i.e., turning off unnecessary network components to reduce the energy consumption. Today, software defined networking (SDN), as one of the most promising solutions for data center management, provides a paradigm to elastically control the resources of DCNs. However, to the best of our knowledge, the features of SDN have not been fully leveraged to improve the power saving, especially for large-scale multi-controller DCNs. To address this problem, we propose E3MC, a mechanism to improve DCN’s energy efficiency via the elastic multi-controller SDN. In E3MC, the energy optimizations for both forwarding and control plane are considered by utilizing SDN’s fine-grained routing and dynamic control mapping. In particular, the flow network theory and the bin-packing heuristic are used to deal with the forwarding plane and control plane, respectively. Our simulation results show that E3MC can achieve more efficient power management, especially in highly structured topologies such as Fat-Tree and BCube, by saving up to 50% of network energy, at an acceptable level of computation cost.
关键词： Data center network,multi-controller,SDN,elastic structure,energy management
更新于2025-09-23 15:19:57
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[IEEE 2019 European Space Power Conference (ESPC) - Juan-les-Pins, France (2019.9.30-2019.10.4)] 2019 European Space Power Conference (ESPC) - Reverse and Forward Modelling of Multijunction Solar Cells with Ecosim
摘要： We demonstrate error-free 100-Gb/s optical packet switching with low power consumption by using a combination of a label processor and 8 × 8 broadcast-and-select (B&S) optical switch. To achieve energy-ef?cient label processing, an optical-trigger-pulse generator that consumes energy only for a very short duration is realized, whereas the optoelectronic serial-to-parallel converter used to interface the fast label bits to a slow CMOS processor has been improved to operate with a reduced trigger pulse energy of 0.35 pJ. Moreover, the electro-absorption-modulator-based B&S optical switch is signi?cantly enhanced by introducing a surface ground electrode for eliminating electrical crosstalk and integrated spot-size converters with easy fabrication process. The total power consumption of the full 8 × 8 optical packet switch is estimated to be as low as 27.3 W or 3.4 W/100-Gb/s port.
关键词： optical label processor,optical switches,optical circuit switching (OCS),optical packet switching (OPS),Data center network
更新于2025-09-23 15:19:57