15 Mar 2026

Wide and Parallel Wins

Lightmatter
N i c k H a r r i s , F o u n d e r a n d C E O , L i g h t m a t t e r
Last week, the Optical Compute Interconnect (OCI) Multi-Source Agreement (MSA)

published its v1.0 line interface specification—a 24-page document co-authored by

NVIDIA, Meta, Microsoft, OpenAI, Broadcom, and AMD that defines the optical physical

layer for AI scale-up interconnects. It specifies Dense Wavelength-Division Multiplexing

(DWDM) wavelength channels in the O-band (around 1300 nm) on a single bidirectional

(BiDi) fiber, micro-ring resonators for modulation, and an external laser source

architecture.

Loading