OpenLight has raised an additional $50 million in an extended Series A funding round, bringing the company’s total funding to $84 million.

The startup, which designs custom application-specific photonic chips, originally secured $34 million in August 2025.

The oversubscribed round was led by Matter Venture Partners and saw participation from new investors, Acclimate Ventures and Catapult Ventures, in addition to existing investors, Xora Innovation, Capricorn Investment Group, Mayfield, and New Legacy.

In a statement, OpenLight said the new funding will support the expansion of OpenLight’s PDK library of active and passive photonics components, including its leading-edge 400G modulator and indium phosphide heterogeneously integrated on-chip laser technology. The startup said it is also focused on ramping up the development of standards-based reference photonic integrated circuits (PICs) at 1.6T and 3.2T.

“The strong interest from leaders across the semiconductor industry underscores the momentum behind OpenLight’s technology and vision,” said Adam Carter, president and CEO of OpenLight. “This oversubscribed funding round adds highly sophisticated investor partners who will enable us to accelerate our strategic roadmap, expand worldwide sales and technical support, and bring heterogeneous photonic integrated circuits to global markets at scale.”

OpenLight’s roots date back to 2008, when its core integrated silicon photonics platform technology was developed at Aurrion, a University of California, Santa Barbara spin-out. Aurrion was acquired by Juniper Networks in 2016, before being reformed as OpenLight in 2022 and securing funding from Juniper and Synopsys.

The startup offers design and manufacturing services around Photonic Application-Specific Integrated Circuit (PASIC) chips, which it claims are the photonic equivalent of traditional ASICs. OpenLight operates an open foundry model, licensing its component library and technology to semiconductor foundries.

Its Process Design Kit (PDK), based on the integration of indium phosphide and silicon photonics, gives customers access to a library of optical components covering integrated lasers, modulators, amplifiers, and detectors that can be integrated on one chip. OpenLight claims that more than 25 companies use its PDK to design and fabricate PASICs across a broad range of applications, including data center interconnect.