# Lightmatter shows a 204.8 Tbps optical switch tray built with Flex and a 102.4 Tbps XPU tray at OCP

Canonical page: https://technooptimist.io/stories/lightmatter-shows-a-204-8-tbps-optical-switch-tray-built-with-flex-and-33144afe
Date: 13 Oct 2026
About: [Lightmatter](https://technooptimist.io/companies/lightmatter.md) · [Passage](https://technooptimist.io/computing/passage.md)
Original source: http://www.prnewswire.com/news-releases/lightmatter-delivers-open-rack-cpo-switch-and-xpu-scale-up-server-through-independent-collaborations-with-flex-and-other-industry-partners-302906361.html

At the OCP Global Summit, Lightmatter showed two rack-scale photonic systems that replace copper links with co-packaged optics. A 204.8 Tbps switch tray built with Flex is a production validation platform, while a 102.4 Tbps XPU tray is a proof-of-concept prototype that Lightmatter developed.

## Key facts

- The switch tray is 1RU and uses eight Passage CPO BiDi engines with Guide DR laser modules in a liquid-cooled chassis.
- The XPU tray is 1RU, holds four accelerator ASICs and two CPUs, and uses four BiDi Passage CPO engines that blind-mate into the rack.
- Lightmatter claims the switch tray gives 2-4x better rack faceplate density than conventional ELSFP lasers and unidirectional fiber harnesses.
- Both trays follow Open Rack v3 and MHS specifications; the Open Silicon Photonics for AI Systems initiative now includes more than 20 companies.
- Neither tray is shown in volume production; an analyst says volume could follow within two years, which is not a company commitment.

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