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In current networks, large flows often co-exist with small flows and consume a significant proportion of the network bandwidth. This imposes a challenge on network resource management. Various hybrid switching architectures have been proposed in recent years aiming to address this challenge and improve efficiency and resource utilization. However, there is still a need for means for design and dimensioning...
We present a performance characterization of the MD-WSS. Furthermore, two low-cost OXCs (6×6 and 8×8) built by interconnecting only two 1∶4 MD-WSSs are proposed and experimentally validated.
Large-scale data centers store a huge amount of the world's data in their cloud servers. To ensure fast, reliable, low power, and low cost transmission, the communication channel between the server units is optical, at the highest available data rates of 100 – 400 Gbps. Consequently, all future solutions should rely on advanced communication techniques combined with high order modulation and digital...
The insertion of mobile ions and coupled changes of electron concentration are exploited to induce a non-volatile and reversible change of the optical properties of mixed ionic and electronic conductors (MIECs). The physical mechanisms responsible for the change of the real and imaginary part of the MIECs' refractive index upon ion-intercalation are extensively investigated in the visible and near-IR...
This paper summarizes recent work on a hierarchical ring-based network architecture (Hi-Ring) for datacentre and short-range applications. The architecture allows leveraging benefits of optical switching technologies while maintaining a high level of connection granularity. We discuss results of optical switching in the various physical dimensions incorporated in the hierarchical nodes and we discuss...
Numerical simulations with all-optical signal processing, e.g. switching by nonlinear fiber Bragg gratings (FBGs) via the optimization of pulse and grating parameters are presented. Using numerical solutions of nonlinear coupled mode equations temporal and spectral pulse profile distortions caused by the modulation instability are investigated and reviewed. The possibilities of elimination of the...
Optically switched networks have potential for high scalability, low power-consumption and increased bandwidth capacity and are considered a promising solution to overcome the bottlenecks in traditional Data Center Networks (DCNs) powered by electronic switches. Even though the major share of power consumption occurs in the edge tier, most of the proposals for future DCNs have concentrated on optical...
We address the potential of a system with gain and loss featuring a PT-symmetric configuration for the realization of tunable, reconfigurable and non-reciprocal devices. By using PT-symmetric coupled waveguides and Bragg reflectors as fundamental building blocks, it is possible to build a wide variety of functional optical devices such as switches, unidirectional Bragg gratings, reconfigurable modal...
This paper proposes a fast beam switching operation for a multi-electrode quasi-stadium laser diode using mode competition between the axial and diamond-shaped resonator modes. Numerical calculations based on rate equations revealed that a switching time of a few nanoseconds can be realized by optimizing the device structure and operating conditions. The effect of gain saturation on the beam switching...
Internet traffic volume continues to increase at a high rate every year. To handle unexpected traffic surges, link failures and growth in traffic volume, network link capacities are typically over-provisioned. To reduce the extent of over-provisioning, we proposed an application and network coordinated multi-layer architecture called ACTION. Application QoE (Quality of Experience) are translated into...
In this paper, we propose a large-scale transparent optical datacentre network with a coordinated congestion management technique, combining optical Fibre Delay Line (FDL) buffering and novel packet retransmission schemes. Two different retransmission mechanisms are investigated: Random Retransmission (RR) and a novel scheme called Pre-Reservation Retransmission (PRR). To examine the efficacy of the...
The development of OXCs/ROADMs has so far mainly focused on the number of input/output fibers to/from optical nodes. This presentation will clarify the implications of node/fiber/WSS degree on OXC/ROADM performance. We show how to create very large-scale and cost-effective OXCs/ROADMs by exploiting current technologies.
The integration of active materials on silicon is emerging as a promising field in silicon photonics to improve the performance metrics of key photonic components, in particular active components. Active materials allow tuning their optical properties as function of external stimuli. Amongst them, vanadium dioxide (VO2) has been largely investigated for different applications due to its controllable...
The spatial superchannel (Sp-Ch) allocation that is enabled by newly developed switching nodes supporting spatial group switching is anticipated to show significant cost savings in future SDM networking deployments. In this paper, we compare the performance of different spatial Sp-Ch switching paradigms, under different spatial and spectral granularities. The spatial granularity is related to the...
This paper discusses burst scheduling problem in Optical Burst Switching (OBS) network with FDLs. Four burst scheduling algorithms are proposed for OBS network with FDL. To fully utilize output link and FDLs, these four algorithms schedules data bursts partially or fully according to the bursts' arriving order. The simulations results show in the OBS switch with feed-forward FDLs, reserving output...
Performance analysis of an opto-electronic packet switch using combined SDM and WDM are presented. The simulations consider a switch connected to 7-core fibers. We point out the benefits of this configuration in various traffic distributions in terms of sustainable load, latency and energy savings for several packet classes.
The future of Internet depends on meeting ever-increasing capacity needs while curbing the energy consumption's uncontrolled growth in data networks, especially in switching. Optics has a tremendous potential to solve these challenges, but the lack of practical optical buffers leaves optical packet switches vulnerable to contention, hindering their use even at moderate network loads. Recent developments...
The arrival of the Single-Atom Transistor (SAT) in 2004, a quantum device operated at room temperature, allowed for the first controlled switching of an electrical current by the reproducible relocation of one single metal atom [1]. At the same time this component established the feasibility of transistors completely made of metals. Meanwhile, many experiments have followed, demonstrating the control...
Photonic integrated networks on chip (NoC) can exploit wavelengths enabling parallelism in data communications between the processors and memory elements of computing systems. A suitable scheduler is, however, required to achieve uniformly low latency and high throughput. In this paper, the performance of a two-step scheduling framework addressing the matching and wavelength assignment problem is...
The NEPHELE network is divided into pods of racks and relies on hybrid electro-optical top-of rack switches that access an all-optical network. To enable dynamic and efficient sharing of the optical resources and a collision-free network operation, the NEPHELE network is envisioned to be operated in a slotted TDMA manner with a software-defined-network (SDN) based control plane. We describe the NEPHELE...
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