Coherent reported Q3 FY 2026 AI optical networking revenue of $1.2 billion, up 45% year-over-year. Total revenue reached $1.6 billion, driven by hyperscaler demand for 800G transceivers to support AI data center expansion.
Key facts
- Q3 FY 2026 AI optical revenue: $1.2B, up 45% YoY.
- Total Q3 revenue: $1.6B, up 22% YoY.
- FY 2026 revenue guidance raised to $6.6B.
- 800G coherent transceivers are the primary growth driver.
- New manufacturing capacity in Pennsylvania and Thailand.
Coherent's Q3 FY 2026 results confirm that optical networking remains a bottleneck and a boom for AI infrastructure. The company reported total revenue of $1.6 billion, up 22% YoY, with AI optical revenue hitting $1.2 billion [According to Coherent's Q3 FY 2026 earnings release]. The primary growth driver is hyperscaler demand for 800G coherent transceivers used in data center interconnects for AI training clusters.
Unique take: The optical layer is now the rate-limiter for AI scaling. As GPU clusters scale to 100,000+ units, the network fabric must keep pace. Coherent's 800G transceivers are the backbone, and the 45% growth signals that hyperscalers are spending aggressively on interconnect, not just compute. This mirrors the pattern seen in 2025 when Lumentum and II-VI (now Coherent) saw similar spikes during the 400G transition.
What the source says: Coherent raised its full-year FY 2026 revenue guidance to $6.6 billion [According to Futurum Group analysis]. The company is investing in new manufacturing capacity in Pennsylvania and Thailand to meet demand. The Q3 results beat analyst expectations on both revenue and earnings per share.
Context: Google Cloud, a major Coherent customer, has been aggressively building out AI data centers, including a $5B+ facility in Texas for Anthropic. Coherent's 800G transceivers are critical for connecting GPU pods in these clusters. The optical supply chain remains constrained, with lead times extending to 20+ weeks for some components.
Contrarian note: The bullish optical story assumes GPU demand holds. If AI model training efficiency improves (e.g., through better architectures or sparsity), the need for interconnect bandwidth could plateau. Coherent's guidance implies no such slowdown in the next 12 months.
What to watch
Watch for Coherent's Q4 FY 2026 earnings in August 2026, specifically whether 800G transceiver orders from Google Cloud and other hyperscalers sustain the 45% growth rate. Also monitor lead times for optical components as a leading indicator of supply tightness.
