Copper cables are choking AI clusters, and two optical companies just reported blowout quarters solving that problem in completely opposite ways. One bets on owning every layer of the stack, the other retreats to the single ingredient nobody else can replicate.
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AI clusters have a wiring problem. Copper cables cannot move enough data between GPU racks, so the industry is switching to light. That shift is why Coherent (NYSE:COHR | COHR Price Prediction) and Lumentum (NASDAQ:LITE) just posted the kind of quarters optical suppliers rarely see. Coherent reported Q4 FY2026 on August 12, 2026, and Lumentum reported a day earlier. Both beat. Their paths diverged.
One Owns the Module. The Other Owns the Laser Inside It.Coherent booked $2.045 billion in revenue, up 33.7% year over year, with the Datacenter & Communications segment producing $1.615 billion, or 79% of sales, growing 59% on a pro forma basis. Non-GAAP EPS came in at $1.74, a 7.60% beat. CEO Jim Anderson framed the setup plainly: “As AI datacenter architectures increasingly transition from copper to optical connectivity, we believe Coherent’s broad photonic technology portfolio and manufacturing scale uniquely position us to deliver accelerating growth.” Translation: own the whole module stack, from indium phosphide wafers up.
Lumentum went the other direction. Revenue hit $1.006 billion, up 109.3% year over year, non-GAAP gross margin reached 50.4%, a 1,260 basis point jump, and operating margin expanded 2,160 basis points to 36.6%. CEO Michael Hurlston said the company is “reaching our target model more than a quarter ahead of schedule.” That is the “pick and shovel” laser engine playing out in real time.
Full Stack vs. Rare Ingredient| Lens | Coherent | Lumentum |
| Core Bet | Own module stack and InP scale | Own high-margin laser engines |
| Q4 Gross Margin | 40.2% | 50.4% |
| Anchor Partner | NVIDIA at Sherman, TX | Hyperscaler CPO order, H1 CY2027 |
| Next Catalyst | CPO/NPO H2 2026, OCS H1 2027 | OCS backlog above $400M |
Coherent is doubling internal InP output by year-end and doubling again by 2027, plus up to $50M in CHIPS Act funding. Vertical integration is the moat to capture massive top-line revenue at scale. Lumentum retreats up the value chain to own the rarest, most indispensable material-science bottleneck, and that shows in a P/S of 25.66 versus Coherent’s 9.74.
What I Am Watching Into FY27Coherent guided Q1 FY27 revenue to $2.20B to $2.40B. Lumentum guided to $1.225B to $1.275B with operating margin of 39.5% to 40.5%. I want to see whether Coherent’s 205% one-year rally converts into CPO revenue on schedule, and whether Lumentum sustains margin now that the target model arrived early.
Where I Come Out on the TwoIf I want breadth, US manufacturing, and the NVIDIA (NASDAQ:NVDA) relationship anchoring my thesis, I lean Coherent. If I want the steepest margin ramp and the most concentrated exposure to the laser bottleneck itself, Lumentum fits better, even at a 43 forward P/E. Both look expensive after a 679% one-year run on LITE, so the next two quarters of CPO and OCS revenue will be the key checkpoints to watch before the story is proven.
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