Radix-expanded densely-spaced WDM technology for co-packaged optics switches
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Date
2026-03-04
Authors
Palmer, R.
Antony, C.
Zheng, B.
Rombouts, M. P. G.
Sarkis, J.
Calabretta, N.
Townsend, P. D.
Talli, G.
Kuschnerov, M.
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Volume Title
Publisher
SPIE
Published Version
Abstract
Optical interconnects are a core technology for scaling AI/ML networks by linking NPU/GPUs directly or through ethernet switches with each other. With switch and link capacities doubling every 2 years, CPO (co-packaged optics) and OIO (optical Input/Output) connectivity solutions are emerging for tackling multiple challenges simultaneously: Reduction of power consumption and latency, and the increase of shoreline bandwidth density. In this work we explore the scaling limitations of DR-based (Direct Reach, parallel fiber output) CPO devices and demonstrate how densely-spaced WDM CPO variants can overcome this bottleneck, while simultaneously supporting a maximum switch radix, within the framework of Horizon Europe project ADOPTION. We demonstrate the first generation of (de-)multiplexer technology and their impact on transmission quality and network architecture.
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Keywords
AWG , Co-packaged optics , Demultiplexing , PLC , Port breakout , WDM , [Physics] , [TyndallPhotonics]
Citation
Palmer, R, Antony, C, Zheng, B, Rombouts, M P G, Sarkis, J, Calabretta, N, Townsend, P D, Talli, G & Kuschnerov, M 2026, Radix-expanded densely-spaced WDM technology for co-packaged optics switches. in R T Chen & R C A Pitwon (eds), Optical Interconnects and Packaging 2026. vol. 13903, 1390302, Proceedings of SPIE - The International Society for Optical Engineering, vol. 13903, SPIE. https://doi.org/10.1117/12.3078430
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© 2026, Published by SPIE. Downloading of the abstract is permitted for personal use only.