Key Highlights

  • Lumentum Holdings reported full-year Revenue of $3.014bn, up 83.2%, with fourth-quarter revenue of $1.01bn and guidance centred on $1.25bn for the first quarter of fiscal 2027.
  • Coherent Corp. reported fourth-quarter fiscal 2026 revenue of $2.05bn, up 34% year on year or 42% on a pro forma basis, describing fiscal 2026 as a record year.
  • Ciena reported fiscal third-quarter revenue of $1.67bn, up 37%, and raised full-year guidance to about $6.42bn, though its shares fell sharply after the print.

Artificial intelligence has turned optical networking from a quiet corner of the technology industry into one of its most closely watched growth stories, and that is the specific reason these three companies belong on any S&P 500 watchlist. As AI clusters scale to tens of thousands of accelerators, the copper links that once shuttled data around a data centre run out of bandwidth and reach. Light, carried over fibre and increasingly generated inside the server rack itself, is filling the gap. Lumentum Holdings Inc. (NASDAQ:LITE), Coherent Corp. (NYSE:COHR) and Ciena Corporation (NYSE:CIEN) sit at different points of that shift, and their latest results show just how fast the money is now moving through the sector.

Lumentum Holdings Inc. (NASDAQ:LITE): Components Riding the 1.6T Wave

Lumentum Holdings, a Nasdaq-listed maker of photonic chips, lasers and optical modules, reported record numbers for the fiscal fourth quarter and full year ended 27 June 2026. Full-year revenue reached $3.014bn, up 83.2% on the prior year, while fourth-quarter revenue was $1.01bn. Non-GAAP Earnings were $3.23 per diluted share for the quarter. The headline GAAP figure was a large net loss, but management attributed this mainly to a roughly $7.8bn non-cash charge tied to the equitisation of convertible notes rather than to trading.

Chief executive Michael Hurlston said the company was reaching its target financial model more than a quarter ahead of schedule, with guidance for the first quarter of fiscal 2027 centred on $1.25bn as cloud customers adopt 1.6T modules and higher-power lasers for co-packaged optics.

Coherent Corp. (NYSE:COHR) and Ciena Corporation (NYSE:CIEN): Modules Versus Systems

Coherent Corp., a NYSE-listed photonics and compound-semiconductor materials group, reported fourth-quarter fiscal 2026 revenue of $2.05bn for the period ended 30 June 2026, up 34% year on year, or 42% on a pro forma basis. Non-GAAP earnings were $1.74 per share and GAAP earnings $1.19. Chief executive Jim Anderson framed the opportunity around AI data-centre architectures shifting from copper to optical connectivity, a multi-year transition he expects to drive accelerating growth for the company's transceiver and laser portfolio. He described fiscal 2026 as a record year with significant Margin expansion, and noted that non-GAAP Earnings Per Share grew at more than twice the pace of revenue. Coherent's breadth in photonic materials and its Manufacturing scale span both telecoms and data-centre customers, giving it a wider base than pure module specialists.

Ciena Corporation, also NYSE-listed, occupies a different rung of the ladder as a pure-play supplier of optical transport systems and networking equipment rather than components. For its fiscal third quarter ended 1 August 2026 it reported revenue of $1.67bn, up 37%, and adjusted earnings of $2.11 per share, a 215% jump. Management raised full-year guidance to about $6.42bn. Even so, the shares fell sharply after the print, a reminder that expectations for the sector have risen almost as fast as revenue and that a strong report is no longer enough on its own.

What Readers Should Watch

The common thread is that AI infrastructure spending is being converted into optical orders at an unusual pace, but the three businesses are not interchangeable. Lumentum and Coherent Supply the lasers, chips and transceivers inside the network; Ciena sells the systems that carriers and cloud operators build around them. That distinction matters for margins and for how directly each is exposed to hyperscaler Capital budgets. The risks are largely shared: customer concentration among a handful of very large buyers, the danger that today's supply constraints become tomorrow's oversupply, and valuations that already assume rapid growth.

Readers should monitor forward guidance, book-to-bill commentary and any sign that hyperscaler spending plans are being trimmed, alongside Lumentum's progress towards restoring GAAP profitability. Reported results are historical; the targets management has set out are expectations, not guarantees.