Tower Semiconductor and Coherent announced a successful demonstration of 400 Gbps‑per‑lane data transmission using a silicon Mach‑Zehnder modulator fabricated in a production‑ready silicon photonics process. The test employed a high‑power continuous‑wave laser from Coherent and produced a clear eye diagram at 420 Gbps PAM‑4, a performance level that supports the next‑generation 3.2 Tbps optical transceivers needed for AI‑driven data‑center workloads.
The breakthrough is significant because it shows that Tower’s silicon photonics platform can deliver the high data rates required for AI workloads while remaining compatible with existing production lines. By leveraging a production‑ready process, Tower can scale the technology to commercial volume without new fabrication steps, accelerating time‑to‑market for high‑speed optical modules and expanding silicon’s role in pluggable and co‑packaged optics.
Tower’s Q4 2025 results provide context for the demonstration. Revenue rose 14% year‑over‑year to $440 million, up 11% quarter‑over‑quarter, and beat analyst expectations of $434.2 million. Basic EPS of $0.71 and diluted EPS of $0.70 were both above the consensus, while adjusted EPS of $0.78 beat the $0.69 estimate. Full‑year 2025 revenue reached $1.57 billion, up 9% from $1.44 billion in 2024, and full‑year EPS of $1.97 basic and $1.94 diluted reflected strong profitability. Tower guided Q1 2026 revenue to $412 million (+/- 5%), a reduction from the prior range of $418 million to $462 million, indicating a cautious outlook amid a competitive market.
The company has invested $920 million in silicon photonics capacity and capabilities, with plans to increase wafer capacity to over five times the Q4 2025 run‑rate by Q4 2026. More than 70% of this capacity is already reserved through 2028, underscoring strong demand visibility. Silicon photonics revenue doubled from $106 million in 2024 to $228 million in 2025, demonstrating rapid growth in this high‑margin segment.
The announcement was well received by investors, with analysts noting the significance of the breakthrough. Management emphasized the strategic importance of the milestone: "The result can extend the use of silicon for another generation of transceivers, re‑utilizing the large multi‑fab capacity investments we continue to make while we proceed with our work on more advanced material systems for next‑generations," said Russell Ellwanger, CEO of Tower Semiconductor. Jim Anderson, CEO of Coherent, added, "Together with Tower Semiconductor, we are advancing high‑performance optical interconnects for AI‑driven data centers." Ellwanger also remarked, "We strongly value the partnership with Coherent and are very excited about this breakthrough."
The demonstration validates Tower’s strategic focus on silicon photonics as a key enabler of AI infrastructure growth and positions the company to capture a larger share of the high‑growth optical transceiver market. The production‑ready process and existing capacity give Tower a competitive advantage over rivals pursuing exotic materials or new fabrication steps, while the partnership with Coherent provides the high‑power laser technology needed to reach the 400 Gbps target. Together, these factors strengthen Tower’s long‑term execution prospects and reinforce its moat in the silicon photonics space.
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