Lumentum Says High-Power Laser Shortage Is Worsening Even Faster Than Demand, While NPO Emerges as a Fully Additive Market on Top of CPO
Fiscal Q4 2026 earnings call, August 11, 2026
Lumentum closed out fiscal 2026 with a quarter that outran its own targets by roughly a year on some metrics, and the guidance for fiscal Q1 2027 pulls forward a revenue milestone the company had not expected to hit until at least one more quarter out. Revenue reached $1.01 billion in the fourth quarter, up 109% year-over-year and 22% sequentially, marking an eighth straight quarter of growth. Non-GAAP gross margin crossed 50% for the first time, a threshold management had originally pegged to a $2 billion quarterly run rate. Non-GAAP operating margin expanded more than 2,150 basis points year-over-year to 36.6%. CEO Michael Hurlston put it plainly: “These results prove two things: our differentiated technology commands premium value and our operating model delivers outsized leverage.”
The forward guide is the more important data point. Lumentum guided fiscal Q1 2027 revenue to a $1.225 billion to $1.275 billion range, with the $1.25 billion midpoint representing the company's previously stated long-term revenue target from its last OFC investor day, achieved more than a quarter ahead of schedule. Operating margin guidance of 39.5% to 40.5% also exceeds the high end of the target model associated with that revenue level. CFO Wajid Ali indicated new long-term targets are likely coming at the next OFC conference, with the prior 38% to 42% operating margin range at $2 billion of revenue likely to move up 100 to 200 basis points.
NPO opens a new, fully incremental TAM alongside CPO
The most significant new disclosure on the call was the extent to which near-packaged optics, or NPO, is developing as a demand driver separate from and additive to co-packaged optics, or CPO. Hurlston was explicit that this had not been part of the framework laid out at the company's last OFC update: “The NPO opportunity is completely additive for us, significantly increasing optical TAM… Even our largest CPO customer is looking at NPO for specific new use cases, further increasing the optical TAM at that account.”
Management described NPO as an intermediate architecture the rest of the customer base is prioritizing ahead of eventual CPO adoption, since it allows optical engines to sit on the board next to the accelerator rather than on the substrate, trading some power efficiency for faster time to market. Two laser types are in play: a mid-power laser integrated directly into the optical engine, and a high-power laser used in an external light source module, or ELS. President of Global Business Units Wupen Yuen noted the bandwidth and integration challenge is severe, comparing a single NPO unit to “about 6.4T of bandwidth, which is really equivalent to 4x that of a local CC module,” and argued Lumentum's 400-milliwatt high-power laser design heritage is uniquely suited to scale down into the 150 to 200 milliwatt range NPO requires. On timing, Hurlston said NPO customer engagements are running “plus or minus, probably maybe minus a quarter” versus the CPO timeline the company has been discussing, with the earliest NPO shipments tied to ELS-style high-power lasers, followed by integrated mid-power designs. Management does not expect any retrofit of NPO onto currently shipping GPUs, ASICs or TPUs; the opportunity is tied to new silicon generations with higher SerDes speeds arriving from mid-2027 into 2028, alongside a broader industry shift toward multi-rack optical scale-up architectures.
CPO demand signal has strengthened, and Lumentum booked its first external light source module order
On the CPO side, management said its lead customer's production plans “remain very much on track” and that “their demand signal has increased since our last update.” The company reiterated a ramp for its ultra-high-power laser chips in the second half of calendar 2027, ahead of customer scale-up deployments in calendar 2028, and disclosed it has now received its first external light source module purchase order, for delivery in the second half of calendar 2027. Hurlston noted the ELS module carries a meaningfully higher average selling price than the discrete lasers Lumentum has been shipping, though margins on the module are somewhat lower than on lasers alone, still above the corporate average. “We're trading a little bit of margin to get some revenue bump,” he said, while arguing the company has enough other margin levers to keep the overall trajectory intact.
High-power laser shortfall has widened, not narrowed, since last quarter
Perhaps the most candid disclosure came in response to a question on supply-demand balance. Management said the EML shortfall is roughly unchanged, but the gap on high-power lasers has worsened materially as demand accelerated faster than capacity. Hurlston said, “If one vector has really changed since the last time you and I talked, I'd say it's your high-power lasers, and we are very much further behind. The demand signal has increased and we are very much further behind relative to our ability to supply.” Yuen clarified that execution itself remains on track; it is the magnitude of demand that has outstripped the ramp plan. This dynamic is driving incremental capacity actions, including a newly disclosed indium phosphide substrate supply agreement with AXT, which Hurlston said was signed in direct response to the demand surge for ultra-high-power lasers, on top of the company's existing arrangement with its Japanese substrate supplier. Management flagged that further substrate deals may be needed if the demand trajectory continues, and that additional long-term agreements covering unused Greensboro fab capacity are likely to be announced over the coming quarters.
CW versus EML economics have converged following a die-size redesign
Lumentum disclosed it has shrunk the die size of its continuous-wave, or CW, laser used in silicon photonics-based 1.6T transceivers, materially narrowing what had previously been a wide margin gap versus its EML lasers. Hurlston said the company is now allocating a portion of excess Japanese fab output, which is running ahead of expectations, toward CW laser production to meet demand in the 200-gigabit-per-lane silicon photonics segment. “We've closed the margin gap quite considerably since our last call,” he said, while maintaining that EMLs remain the better margin business overall. The company still expects EMLs to represent the majority of 200-gig-per-lane laser volume by mid-2027, with that mix currently at 25% of EML revenue, up from a smaller base last quarter. Management does not see silicon photonics displacing EMLs longer-term, arguing that at 3.2T speeds EML economics reassert themselves.
Chinese indium phosphide entrants dismissed, for now
Asked about emerging Chinese indium phosphide laser fabs, Hurlston was direct: “I caution people also, I think some of these Chinese laser suppliers are not delivering in the market today. So they have very -- there's no recourse when they throw out these big numbers. We have not seen anything like that to date in terms of their output.” He pointed to Lumentum's ability to command price premiums on CW lasers specifically because of superior yield consistency, noting the narrow tolerance band on its lasers translates into materially better transceiver yields for customers, a differentiation he expects to persist even as Chinese supply comes online.
OCS execution ahead of a customer's in-house alternative
Optical circuit switching revenue is guided to its first triple-digit quarterly figure in fiscal Q1, following a doubling of shipments from fiscal Q3 to Q4. Management said the business remains on track to hit its previously disclosed $400 million-plus target for the second half of calendar 2026, though not ahead of it, given early supply chain constraints that have since been resolved. On the competitive dynamic with a hyperscale customer that maintains an internal OCS source, Hurlston said Lumentum expects to become the number one supplier to that account by early calendar 2027: “I think our customers, in general, if you talk to them, would say we've been an incredibly, incredibly strong supplier.” The company also disclosed it is now developing higher and lower port-count OCS variants, including specialized in-tray offerings, which management characterized as fully additive to the TAM outlined at the last OFC and targeted for calendar 2028, while noting Lumentum remains the only merchant OCS supplier with a shipping track record outside captive manufacturing arrangements.
Pump lasers sold out with multi-year take-or-pay style agreements
Pump laser shipments grew more than 80% year-over-year for a second consecutive quarter, and management reiterated an expected fourfold increase over the next several quarters, with the business effectively sold out throughout. Hurlston estimated Lumentum holds 70% to 80% share in this category and disclosed that the company has signed a series of roughly three-year agreements with network equipment manufacturers that include pricing levers and, in most cases, take-or-pay structures, helping offset the capital spending required to ramp the Rose Orchard facility and downstream packaging and test operations in Thailand. He described the scale of demand starkly: for one major hyperscaler, the network capacity connecting just two AI data center sites could double the total global backbone capacity built over the prior decade.
Balance sheet: convert equitization drove a large one-time GAAP charge
During the quarter, Lumentum proactively equitized a portion of its in-the-money convertible notes following the stock's appreciation, reducing debt by $1.1 billion, or approximately 35% of outstanding convertible debt. The transaction produced a one-time non-cash GAAP charge of $7.8 billion, driving a GAAP net loss of $7.2 billion for the quarter, a figure that sits alongside non-GAAP net income of $326.3 million and non-GAAP EPS of $3.23. Cash and short-term investments fell by $430 million sequentially to $2.74 billion, primarily reflecting the convert conversions, while inventory rose $59 million to support expected cloud and AI-related revenue growth. Capital expenditures totaled $167 million in the quarter, concentrated on manufacturing capacity for cloud and AI customers.