Salience Labs has announced $125 million in Series B financing to expand its silicon-photonics-based optical circuit switching technology for AI data center networks. The funding round includes Bullhound Capital and participation from AMD Ventures and Intel Capital.

The company is developing optical switching systems intended to establish and reconfigure optical paths between computing resources. Salience has demonstrated a 64-port optical circuit switch, positioning the technology for evaluation in AI fabrics where bandwidth demands and network reconfiguration are increasing.

The new funding is intended to support manufacturing scale-up and commercial deployment. Optical circuit switching is complementary to, rather than a direct substitute for, packet switching in many network designs; adoption will depend on application requirements, control software and integration with existing fabrics.

Analysis

Salience Labs’ $125 million Series B comes as optical circuit switching (OCS) emerges as an increasingly important technology for AI data center networks. Unlike conventional Ethernet switches, OCS establishes direct optical connections between endpoints without intermediate optical-electrical-optical conversion or electronic packet processing. This approach can reduce power consumption and switching-layer latency while enabling dynamic network reconfiguration. Google has been a leading adopter, deploying MEMS-based optical circuit switches in its Jupiter data center network and TPU infrastructure. Market research firm Cignal AI projects the global OCS market will reach at least $2.5 billion by 2029, reflecting growing interest in optical switching for AI scale-out and potentially scale-up architectures.

Competition is intensifying among established optical suppliers and photonics startups. Lumentum is developing MEMS-based OCS platforms, including its R64 system, while Coherent and HUBER+SUHNER POLATIS are also active in optical switching. Emerging players include iPronics, nEye, and Lumotive, each pursuing different approaches to photonic switching and beam steering. The Open Compute Project established an Optical Circuit Switching Subproject in 2025 to advance interoperability, control interfaces, and industry specifications. The competitive landscape encompasses MEMS-based systems, free-space optical switching, and integrated silicon photonics, with differentiation centered on port density, insertion loss, switching speed, power efficiency, and manufacturing scalability.

Salience Labs is positioning its silicon photonics architecture as an alternative to conventional MEMS-based optical switching. Its 64-port all-optical switch demonstration at ECOC 2026 and roadmap toward 128-port and 256-port systems highlight its ambitions to increase switching density through photonic integration. The new financing will support product development, manufacturing scale-up, and customer qualification. Participation by AMD Ventures and Intel Capital underscores investor interest in optical networking technologies for AI infrastructure, although commercial adoption remains to be demonstrated. The next milestones for Salience will be production readiness, system reliability, customer deployments, and its ability to compete against established OCS suppliers.

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