OpenLight Built on Tower's Open Foundry

This reveals that OpenLight is building on a shared factory rail, not a captive one. OpenLight sells customers a laser integrated photonics platform on Tower’s PH18DA process, but Tower also markets its PH18 silicon photonics platform as an open foundry to any customer and has used it with partners like Quintessent and Alcyon. That means OpenLight gets fast access to proven manufacturing, but cannot assume exclusive process priority as demand for AI optics rises.

• The practical tension is simple. OpenLight wins business by giving module makers a design kit, reference PICs, and a path to tape out on Tower without building a fab relationship from scratch. But the same manufacturing base can also enable rival photonics platforms that want to reach those customers.
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• Tower is not just a neutral contract manufacturer. It actively advertises PH18 as an open silicon photonics platform for data center interconnect and high performance computing, and has expanded the platform with additional heterogeneous laser capabilities through outside collaborations. That broadens the ecosystem, but also broadens overlap with OpenLight.
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• This sits inside a wider squeeze on independent photonics platforms. Ayar Labs is chasing optical I/O tightly tied to CPU and GPU packages, while Lightmatter and Celestial AI are pushing architectures that blend communication with compute or memory movement. OpenLight therefore depends on Tower for supply while also racing multiple routes to the same AI optical budget.
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Going forward, the winners in photonics will pair differentiated device IP with the fastest path to reliable volume production. OpenLight’s advantage will come from making PH18DA feel like the easiest way for customers to get laser integrated PICs into production before Tower’s broader open foundry model gives competing platforms the same manufacturing credibility.