Segment revenue mix
Lumentum reports two operating segments: Cloud & Networking and Industrial Tech. The mix has shifted dramatically over the FY2024 → FY2025 → FY2026 window — Cloud & Networking has grown from 80% to ~86%+ of revenue while Industrial Tech has shrunk in both relative and absolute terms.
Annual segment revenue (last three full fiscal years)
| Segment | FY2023 | FY2024 | FY2025 | FY2024 → FY2025 |
|---|---|---|---|---|
| Cloud & Networking | $1,322.5M | $1,084.9M | $1,410.8M | +30.0% |
| Industrial Tech | $444.5M | $274.3M | $234.2M | -14.6% |
| Total | $1,767.0M | $1,359.2M | $1,645.0M | +21.0% |
| Cloud & Networking share | 74.8% | 79.8% | 85.8% | trending up |
| Industrial Tech share | 25.2% | 20.2% | 14.2% | trending down |
Sources: Lumentum FY2025 10-K, FY2024 10-K segment disclosures ✓.
Quarterly segment trajectory (selected quarters)
| Quarter | Cloud & Networking ($M) | Industrial Tech ($M) | Total ($M) | C&N % of total |
|---|---|---|---|---|
| Q4 FY2024 | n/a (segment-detail) | n/a | $308.3 | n/a |
| Q1 FY2025 | n/a | n/a | $336.9 | ~78% (estimated) |
| Q2 FY2025 | $339.2 | $63.0 | $402.2 | 84.3% |
| Q3 FY2025 | n/a | n/a | $425.2 | ~86%+ |
| Q4 FY2025 | $424.1 | n/a | $480.7 | 88.2% |
| Q1 FY2026 | n/a | n/a | $533.8 | ~88%+ |
| Q2 FY2026 (component view) | $443.7 components + $221.8 systems | n/a (combined view) | $665.5 | n/a in this format |
Note: Lumentum’s Q2 FY2026 release switched the disclosure framing to components vs systems rather than Cloud & Networking vs Industrial Tech. Components ($443.7M, 66.7% of revenue) maps roughly to the EML-chip and laser-source layer; Systems ($221.8M, 33.3%) maps roughly to finished modules (Cloud Light) and ROADM/transponder subsystems. The segment-vs-product-type cross-walk is not always one-to-one and management framing has been progressively reorganized.
AI / non-AI splits — Cloud & Networking decomposition
Lumentum does not formally disclose AI-specific revenue inside Cloud & Networking, but management commentary and the disclosed product-mix indicators allow approximate decomposition. Inside Cloud & Networking the implicit sub-segments are:
| Cloud & Networking sub-layer | Approximate FY2025 share | Trajectory |
|---|---|---|
| InP EML chips (datacom, hyperscaler) | ~30–35% | Fastest-growing; AI-pull-driven |
| Cloud Light datacom transceivers (modules) | ~25–30% | Fast-growing; hyperscaler-direct |
| Telecom transport components (ROADM, WSS, tunable lasers, optical amps) | ~30–35% | Recovering; carrier-capex-driven |
| Other / sub-systems | ~5–10% | Stable |
⚠ These splits are inferred from management qualitative commentary and Cloud Light’s pre-acquisition revenue base; not formally disclosed in segment reporting.
The “AI-pull” portion of Cloud & Networking — roughly the InP EML chip layer plus the AI-allocated portion of Cloud Light transceivers — is plausibly ~50–60% of FY2025 Cloud & Networking revenue, which translates to ~$700–850M of FY2025 AI-photonics revenue. The Q2 FY2026 quarterly run-rate ($665.5M total revenue × ~88% Cloud & Networking × ~60% AI = ~$350M/quarter, or ~$1.4B annualized) is consistent with management’s framing that AI demand is the dominant marginal growth driver.
The non-AI portion of Cloud & Networking — telecom transport, hyperscaler-non-AI cloud, datacom upgrades — is the more cyclical layer that benefits from carrier-capex normalization and ZR/ZR+ pluggable adoption.
Industrial Tech decomposition
| Industrial Tech sub-layer | FY2025 share | Notes |
|---|---|---|
| 3D-sensing VCSEL | ~50–60% | Apple-driven; declining |
| Industrial lasers (cutting/welding/marking) | ~30–35% | Cyclical; manufacturing-capex-driven |
| Other (specialty / aerospace / defense) | ~10–15% | Niche |
⚠ Inferred from segment disclosures and product-line commentary; not formally disclosed.
Forward mix trajectory
Three trends compound through FY2026 → FY2028:
- Cloud & Networking grows several times faster than Industrial Tech — the share gap will widen further. By FY2027, Cloud & Networking could be 90%+ of total revenue.
- AI-photonics growth concentrates inside Cloud & Networking — both at the chip layer (200G/lane EML, 1.6T modulators) and at the module layer (1.6T transceivers, eventually CPO). The NVDA-allocated capacity is a step-function uplift.
- Industrial Tech provides stable annuity / counter-cyclical cushion — but its share of total is declining and its impact on consolidated growth is dwindling.
For thesis purposes, Lumentum is increasingly a pure-play AI-photonics name with a small ballast of industrial cash flow. This raises both the upside beta (AI capex acceleration drops directly to the bottom line) and the downside beta (any AI-capex pause hits Cloud & Networking disproportionately).
Cross-link
- Quarterly trend — total-company quarterly numbers
- Margins and pricing — gross-margin and ASP detail
- Cloud Light integration — finished-module business
- 04_market AI capex cycle
- 04_market datacenter optics TAM