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primarysourced Photonics sector Coherent
COHR
~2 min read · 374 words ·updated 2026-04-29 · confidence 25%

Market overview

Coherent’s end markets sit at the intersection of four demand cycles:

  1. AI-datacenter optical interconnect — the load-bearing growth driver; 400G/800G/1.6T pluggable transceivers and (looking forward) CPO. InP EML at 200G/lane is the source-laser layer; vertical integration into transceivers captures more of the value stack than the component layer alone.
  2. Telecom transport (long-haul / metro) — coherent-DWDM ROADM/wave-shaper deployments. Slower-growing but stable.
  3. SiC power-electronics — EV inverters, datacenter power, industrial. Cyclical but with strong long-term EV-driven growth; subject to Chinese substrate-supply pressure.
  4. Industrial lasers + life sciences — cutting/welding/additive (Coherent Inc. legacy); life-sciences instrumentation. Lower growth, more cyclical.

AI capex cycle (decisive)

The optical-transceiver demand pull from AI clusters is the dominant variable. The March 2026 NVDA $2B common-stock investment in Coherent (paired with $2B Series A Preferred in Lumentum) is itself a market-data point: NVDA judged supply-chain criticality of EML capacity sufficient to commit balance-sheet capital to both incumbents.

Datacenter optics TAM

Industry consensus (LightCounting, Cignal AI, Dell’Oro) sizes the total datacenter optical-transceiver TAM at $20-25B in 2026, growing to $40-60B by 2028 under the AI-pull baseline. Coherent and Lumentum together hold ~80%+ of the merchant EML supply.

⚠ Aggregator estimates — exact TAM/SAM allocation between component layers, ASP trends, and CPO transition timing are research-firm estimates and should be flagged ◐.

SiC power-electronics TAM

The SiC substrate + device market is sized at $5-7B in 2026 by industry trade press (Yole Développement, IDTechEx), with EV-inverter applications dominating. Pricing pressure from Chinese substrate suppliers (TankeBlue, SICC) is the structural risk. Coherent’s SiC franchise is in materials-substrate, not finished SiC devices — different competitive dynamics than Wolfspeed.

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