They are allocating product through 2026, yet gross margins compressed because they can't manufacture the new stuff cleanly yet.
Thesis: Lumentum owns the EML bottleneck for the AI buildout. They are effectively sold out through 2026, creating a 'Backlog Fortress'. The margin compression in Q2 is transient (yield learning curve + empty factory startup costs). As Thailand fills and yields normalize, operating leverage will surprise to the upside. The 'proprietary interconnect' win is a hidden call option on custom silicon clusters.
Verdict: LONG — Conviction: HIGH
Catalyst: Ramp of 'Customer 3' in fiscal Q4 and the proprietary ultra-high power laser hitting volume in CY2026.
Key Risk: The Sagamihara fab in Japan is the hard constraint. If that fab cannot deliver the 40% wafer growth, Lumentum cannot ship, regardless of demand.
The Tell: The discussion of the 'proprietary interconnect' customer. Management revealed they are shipping preproduction volumes of a 'unique ultra-high power laser' that moves to 'extremely high volume' in 2026. This isn't a standard transceiver; it's likely a custom AI cluster interconnect (TPU/Trainium/Dojo equivalent).
Friction Level: MODERATE_FRICTION — Bulls see the allocation visibility through 2026 as a guaranteed revenue ramp. Bears see the Japan fab constraint and Thailand startup costs as a structural cap on margin expansion.
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