Silicon Photonic Flex-LIONS for Bandwidth-Reconfigurable Optical Interconnects

Xiao, Xian; Proietti, Roberto; Liu, Gengchen; Lu, Hanchao; Fotouhi, Pouya; Werner, Sebastian; Yu, Zhangjun; Yoo, S. J. B.

doi:10.1109/jstqe.2019.2950770

Cited by 25 publications

(5 citation statements)

References 43 publications

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“…At the physical layer, an important aspect to consider is the scalability to large radix, which is mainly limited by crosstalk, loss, and the number of wavelengths. A promising approach is using a Thin-CLOS Flex-LIONS architecture as reported in [8]. All of the above aspects will be the objectives of our future studies.…”

Section: Discussionmentioning

confidence: 99%

“…The remainder of this paper is organized as follows: Section 2 introduces the working principle of Flex-LIONS with multiple FSRs. Section 3 discusses the fabrication of Flex-LIONS chips using a spatial switch based on a microring resonator (MRR) matrix (as in [8]) or a Beneš Mach-Zehnder switch (MZS) network [9]- [11]. Section 4 reports an experimental demonstration of the Multi-FSR Flex-LIONS principle using a fabricated 8-port SiPh integrated Copyright c 2020 The Institute of Electronics, Information and Communication Engineers chip.…”

Section: Introductionmentioning

confidence: 99%

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Flex-LIONS: A Silicon Photonic Bandwidth-Reconfigurable Optical Switch Fabric

Proietti

Xiao

Fariborz

et al. 2020

IEICE Trans. Commun.

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This paper summarizes our recent studies on architecture, photonic integration, system validation and networking performance analysis of a flexible low-latency interconnect optical network switch (Flex-LIONS) for datacenter and high-performance computing (HPC) applications. Flex-LIONS leverages the all-to-all wavelength routing property in arrayed waveguide grating routers (AWGRs) combined with microring resonator (MRR)-based add/drop filtering and multi-wavelength spatial switching to enable topology and bandwidth reconfigurability to adapt the interconnection to different traffic profiles. By exploiting the multiple free spectral ranges of AWGRs, it is also possible to provide reconfiguration while maintaining minimum-diameter all-to-all interconnectivity. We report experimental results on the design, fabrication, and system testing of 8 × 8 silicon photonic (SiPh) Flex-LIONS chips demonstrating error-free all-to-all communication and reconfiguration exploiting different free spectral ranges (FSR 0 and FSR 1 , respectively). After reconfiguration in FSR 1 , the bandwidth between the selected pair of nodes is increased from 50 Gb/s to 125 Gb/s while an all interconnectivity at 25 Gb/s is maintained using FSR 0. Finally, we investigate the use of Flex-LIONS in two different networking scenarios. First, networking simulations for a 256-node datacenter inter-rack communication scenario show the potential latency and energy benefits when using Flex-LIONS for optical reconfiguration based on different traffic profiles (a legacy fat-tree architecture is used for comparison). Second, we demonstrate the benefits of leveraging two FSRs in an 8-node 64-core computing system to provide reconfiguration for the hotspot nodes while maintaining minimum-diameter all-to-all interconnectivity.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flex-LIONS: A Silicon Photonic Bandwidth-Reconfigurable Optical Switch Fabric

Proietti

Xiao

Fariborz

et al. 2020

IEICE Trans. Commun.

Self Cite

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“…In this regard, optical networks based on Wavelength Division Multiplexing (WDM) are seen as the main enabler for a seamless resource disaggregation. Some of the works have focused solely on the design and evaluation of flexible network fabrics to be exploited within CDC infrastructures (e.g., [6]) while others also focused on their integration with the hardware blades and the performance of the full system. As a result, several optical network designs have been proposed (e.g., [1,2]), with some works advocating for the use of hybrid networks combining electrical and optical switching technologies (e.g., [8]).…”

Section: Related Workmentioning

confidence: 99%

On the Complexity of Configuration and Orchestration for Enabling Disaggregated Server Provisioning in Optical Composable Data Centres

Pages¹,

Agraz²,

Spadaro³

2022

J. Opt. Commun. Netw.

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Due to the limitations of traditional data center (DC) architectures, the concept of infrastructure disaggregation has been proposed. DC resources are separated into multiple blades to be exploited independently. As a result, composable DC (CDC) infrastructures are achieved, enhancing the modularity of resource provisioning. However, disaggregation introduces additional challenges that need to be carefully analyzed. One relates to the potential complexity increase on the orchestration and infrastructure configuration that need to be performed when provisioning resources to support services. This aspect is highly influenced by the distribution of resources at the physical infrastructure. As such, when analyzing the performance of a CDC, it becomes essential to also study the related operational complexity of the resource orchestration and configuration phases. Furthermore, the requirements of several tenant services may impose heterogeneous deployments over the shared physical infrastructure in the form of either disaggregated single-server or multi-server distributions. The associated orchestration/configuration cost is again highly influenced by the data plane architecture of the CDC. With these aspects in mind, in this paper, we provide a methodology for analysis of the complexity of resource orchestration for a service deployment and the associated configuration cost in optical CDCs, considering various service deployment setups. A selected set of CDC architectures found in the literature is employed to quantitatively illustrate how the data plane design and service deployment strategies affect the complexity of infrastructure configuration and resource orchestration.

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“…The other method is to construct a threedimensional (3D) network by achieving photonic integration layer by layer [15][16][17][18]. Besides crystalline silicon (c-Si) [19,20], amorphous silicon (a-Si) [15] and silicon nitride (SiN) [16,17,21] have been bonded or deposited and patterned on a siliconon-insulator (SOI) platform for dense integration. These 3D integration photonic devices are composed of either multiple passive layers [22] or multiple passive layers integrated with another active one [23], but none of them are all active layers.…”

Section: Introductionmentioning

confidence: 99%

Scalable 3D Silicon Optical Switch Based on CLOS Architecture

et al. 2022

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To achieve complex functionality with small size, weight and power, photonic integrated circuits (PIC) are expanded from two-dimensional (2D) to three-dimensional (3D). In this paper, a new design for a scalable 3D silicon optical switch is proposed. Key elements, including silicon electro-optic switches, crossings, and interlayer transitions are used to define and optimize the 3D optical switching network. The architecture is based on CLOS architecture, which can be extended to multiple layers. Silicon-based two-and three-layer switches are carefully designed and analyzed as an example based on the transfer matrix technique (TMT). In a 4×4 two-layer optical switch, the average insertion loss at 1550 nm wavelength is ~4.16 dB, and ~3.69 dB for the "all-cross" and "all-bar" states, respectively. In a 4×4 threelayer optical switch, the average insertion loss at 1550 nm wavelength is ~5.96 dB, and ~5.41 dB for the "all-cross" and "allbar" states, respectively. The architecture also shows the scalability of both the port number and the layer number. The scalable 3D architecture proposed could improve the interconnect density twice and thrice in a single-layer design.

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Silicon Photonic Flex-LIONS for Bandwidth-Reconfigurable Optical Interconnects

Cited by 25 publications

References 43 publications

Flex-LIONS: A Silicon Photonic Bandwidth-Reconfigurable Optical Switch Fabric

Flex-LIONS: A Silicon Photonic Bandwidth-Reconfigurable Optical Switch Fabric

On the Complexity of Configuration and Orchestration for Enabling Disaggregated Server Provisioning in Optical Composable Data Centres

Scalable 3D Silicon Optical Switch Based on CLOS Architecture

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