# Who does Ciena pay? Who are its key suppliers?
Canonical: https://valuechain.wiki/ciena · Facet: suppliers · Updated: 2026-07-12T04:19:37.470092+00:00 · Source: ValueChain.wiki (cited money-flow graph)

**Citable summary**: Ciena's confirmed suppliers/cost counterparties include Sumitomo Electric plus 2 undisclosed/aggregate relationships. Per the valuechain.wiki graph: 3 cost edges, backed by 3 dated sources, 1 of them primary filings (as of 2026-07-12).

### Sumitomo Electric (mid)  → /sumitomo-electric.md
- note: Sources fiber for DCI systems from Sumitomo and Corning — the materials cost axis of long-haul links.
- [confirms] Sumitomo Lightwave (EN, news, published 2026-01-01) https://blog.sumitomoelectriclightwave.com/ai-ready-connectors-for-facilities-of-any-size: "Sources fiber for DCI systems from Sumitomo, Corning and others."

### 제조·R&D (비공개) (low)
- note: Optical-transport manufacturing and R&D — investment setting the pace of generation shifts (undisclosed).
- [confirms] Ciena KR (KO, ir, published 2026-01-01) https://www.ciena.kr/solutions/global-data-center-interconnect-networking: "Coherent optical-transport systems."

### 광부품·DSP (비공개) (low)
- note: Coherent optics and in-house WaveLogic DSP — the cost/technology axis of its competitive moat (undisclosed).
- [confirms] SEC EDGAR (EN, filing, published 2025-12-11) https://www.sec.gov/Archives/edgar/data/0000936395/000162828025056425/ex9912025q4earningspressre.htm: "WaveLogic 6 coherent DSP."

Reverse side: https://valuechain.wiki/ciena/customers.md · Ripple: https://valuechain.wiki/ciena/ripple.md

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Full node: https://valuechain.wiki/ciena.md · JSON: https://valuechain.wiki/ciena.json