Partnering with SILITH Technology, UMC took a 1.6T silicon photonics platform from development to volume production readiness in just 18 months. Wafers are already qualified by a top-tier cloud customer for high-speed AI data centre deployments which is encouraging for the Taiwanese fab as a proof point of its entry into the SiPh ecosystem. The move from legacy 8-inch to 12-inch wafers is prudent to drive massive economies of scale, lower per-unit costs, and high-volume reliability. 

Expanding UMC’s Roadmap: 

• Commercializing 200G/lane today
• Co-developing 400G/lane pure-silicon next 
• Partnered with imec to license imec’s iSiPP300 technology to bring a 12-inch foundry platform blended with UMC’s expertise in silicon-on-insulator (SOI) wafer processing and 8-inch silicon photonics IC (PIC) platform
• TFLN & Co-Packaged Optics (CPO) integration is upcoming

Competition got intense in SiPh Foundry Ecosystem

SiPh is moving into mainstream manufacturing quickly, and it's great to see diversification and UMC stepping up.

Focused Pure Play for SiPh UMC is doubling down on the pure-play AI optical interconnect market rather than chasing a more integrated model. Also, a Singapore hub offers good geopolitical cover vs just Taiwan. 

GlobalFoundries has been an incumbent in SiPh with its SCALE™. But UMC's announcement could challenge GF's market share and mindshare. TSMC is working on its own advanced COUPE architecture, which nicely chimes with the leadership in end-to-end AI compute. It will be interesting to see how its customers diversify to employ standalone fabs such as UMC for the upcoming optical transceiver wave. 

At Counterpoint Research, we have been actively tracking the Silicon Photonics development and have been publishing multiple insights, trends and discussions trying to connect the dots from foundry to chips to servers and end demand.

• GlobalFoundries Gains First-Mover Advantage with Roll-Out of OCI-Based Scale-Up Silicon
• Optics Without Lock-In: Will NPO and Pluggable CPX Preserve Multi-Vendor Sourcing in Next-Generation Switching?
• Lightmatter Joins NVLink Fusion Club
• NVIDIA Leads Transition to CPO-Based Rackscale Networking
• AI Data Centers - Zutacore In Pole Position To Benefit From Transition To Two-Phase Cooling
• Astera Labs Ships Scorpio-X Scale-Up Switch, Predicts Continued Strong Growth
• Overcoming Scale-Up Challenges in AI Rackscale Compute Systems
• AI Server Compute ASIC Shipments to Triple by 2027 as Custom Silicon Enters Hyper-Growth Phase