# Who are Sumitomo Electric's customers? Who does Sumitomo Electric earn revenue from?
Canonical: https://valuechain.wiki/sumitomo-electric · Facet: customers · Updated: 2026-07-12T08:19:57.523251+00:00 · Source: ValueChain.wiki (cited money-flow graph)

**Citable summary**: Sumitomo Electric's confirmed revenue counterparties include Ciena, 마이크로소프트 plus 2 undisclosed/aggregate relationships. Per the valuechain.wiki graph: 4 revenue edges, backed by 4 dated sources, 2 of them primary filings (as of 2026-07-12).

### 하이퍼스케일러·통신 (광케이블) (high)
- note: Supplies optical fiber and cable to hyperscalers and telecoms; surging AI-datacenter optical cabling drives fiber demand.
- [confirms] IEEE ComSoc (EN, research, published 2025-12-23) https://techblog.comsoc.org/2025/12/23/how-will-fiber-and-equipment-vendors-meet-the-increased-demand-for-fiber-in-2026-due-to-ai-data-center-buildouts/: "Rising datacenter optical-cabling adoption."
- [confirms] Sumitomo Electric (JA, filing, published 2025-06-25) https://sumitomoelectric.com/rd/info-communications: "Rising datacenter optical-cabling adoption."

### Ciena (mid)  → /ciena.md
- note: Supplies ultra-low-loss fiber and connectors into Ciena's coherent transport systems (DCI) — the materials channel for long-haul optical links between AI data centers.
- [mentions] Sumitomo Electric (EN, filing, published 2026-05-01) https://sumitomoelectric.com/ir/library: "Datacenter optical cable, wire and auto-parts demand; FY2026 IR results."
- [confirms] Sumitomo Lightwave (EN, news, published 2026-01-01) https://blog.sumitomoelectriclightwave.com/ai-ready-connectors-for-facilities-of-any-size: "Supplies ultra-low-loss fiber/connectors for coherent transport (DCI)."
- [confirms] Sumitomo Electric (JA, filing, published 2025-06-25) https://sumitomoelectric.com/rd/info-communications: "Supplies ultra-low-loss fiber/connectors for coherent transport (DCI)."

### 전장·전력·화합물반도체 (mid)
- note: Wire/power cables, GaN compound semiconductors and automotive electronics — the diversified businesses beyond optics that stabilize but also dilute an optics boom.
- [confirms] Sumitomo Electric (JA, filing, published 2025-06-25) https://sumitomoelectric.com/rd/info-communications: "Diversified wire/component business."

### 마이크로소프트 (mid)  → /microsoft.md
- note: Supplies optical fiber and cable to Microsoft data centers — a direct hyperscaler-adoption channel.
- [confirms] Sumitomo Lightwave (EN, news, published 2026-01-01) https://blog.sumitomoelectriclightwave.com/ai-ready-connectors-for-facilities-of-any-size: "Optical fiber/cable to Microsoft datacenters."

Reverse side: https://valuechain.wiki/sumitomo-electric/suppliers.md · Ripple: https://valuechain.wiki/sumitomo-electric/ripple.md

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