Scalability analysis of optical Beneš networks based on thermally/electrically tuned Mach-Zehnder interferometers

Kynigos, Markos; Pascual, José Antonio; Navaridas, Javier; Luján, Mikel; Goodacre, John

doi:10.1145/3356045.3360715

Cited by 1 publication

(3 citation statements)

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“…Yuen and Chen [35] also propose a methodology for exploiting hardware asymmetries in MRR-based photonic ICs. In [16], we proposed routing algorithms which leverage the underlying hardware constraints of EO/TO MZI-based Beneš ICs, showing reductions in optical losses and switching energy. These are the algorithms we are leveraging with TDM to improve overall performance.…”

Section: Mzi-based Optical Switching Fabricsmentioning

confidence: 99%

“…This work builds upon this idea and shows that enhancing such functions with TDM switching can offer significant benefits in both execution time and energy efficiency. Hence we consider a subset of the hardware-aware routing strategies we proposed in [16]. Our objective is to demonstrate that the approach can be generalized and is independent of other switching aspects.…”

Section: Power Efficient Routing In Photonic Beneš Networkmentioning

confidence: 99%

“…The Beneš network is a rearrangeably non-blocking topology composed of the least amount of 2×2 switches necessary to connect N×N endpoints, leading to the least optical loss when using photonic 2×2 switches such as Mach-Zehnder Interferometers (MZIs). However, standard network control algorithms such as the łLooping Algorithm" [23] are unable to provide energy and power efficient configurations for photonic Beneš fabrics, while algorithms that do so, such as łhardware-inspired routing", introduce contention in the switch fabric [16].…”

Section: Introductionmentioning

confidence: 99%

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Power and energy efficient routing for Mach-Zehnder interferometer based photonic switches

Kynigos

Pascual

Navaridas

et al. 2021

Proceedings of the ACM International Conference on Supercomputing

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Silicon Photonic top-of-rack (ToR) switches are highly desirable for the datacenter (DC) and high-performance computing (HPC) domains for their potential high-bandwidth and energy efficiency. Recently, photonic Beneš switching fabrics based on Mach-Zehnder Interferometers (MZIs) have been proposed as a promising candidate for the internals of high-performance switches. However, state-of-the-art routing algorithms that control these switching fabrics are either computationally complex or unable to provide non-blocking, energy efficient routing permutations.To address this, we propose for the first time a combination of energy efficient routing algorithms and time-division multiplexing (TDM). We evaluate this approach by conducting a simulationbased performance evaluation of a 16x16 Beneš fabric, deployed as a ToR switch, when handling a set of 8 representative workloads from the DC and HPC domains.Our results show that state-of-the-art approaches (circuit switched energy efficient routing algorithms) introduce up to 23% contention in the switching fabric for some workloads, thereby increasing communication time. We show that augmenting the algorithms with TDM can ameliorate switch fabric contention by segmenting communication data and gracefully interleaving the segments, thus reducing communication time by up to 20% in the best case. We also discuss the impact of the TDM segment size, finding that although a 10KB segment size is the most beneficial in reducing communication time, a 100KB segment size offers similar performance while requiring a less stringent path-computation time window. Finally, we assess the impact of TDM on path-dependent insertion loss and switching energy consumption, finding it to be minimal in all cases.

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Section: Mzi-based Optical Switching Fabricsmentioning

confidence: 99%

Section: Power Efficient Routing In Photonic Beneš Networkmentioning

confidence: 99%