Coherent has launched PhotonLink, an integrated optics platform aimed at one of the biggest physical problems facing AI data centers: moving enormous amounts of data between processors without allowing electrical interconnect power and distance to become the bottleneck.
Announced during ECOC 2026, PhotonLink supports co-packaged optics (CPO), near-packaged optics (NPO) and emerging chip-to-chip optical connectivity. Instead of treating lasers, silicon photonics, fibers and detectors as separate components, Coherent is positioning the platform as an integrated optical path spanning light generation, signal conditioning, transmission and reception.
Why AI Is Pushing Optics Closer to the Chip
Modern AI clusters depend on far more than GPU arithmetic. Thousands of accelerators must exchange data quickly enough that processors do not spend valuable cycles waiting on the network. Traditional electrical connections remain essential, but signal loss and power consumption become increasingly difficult as bandwidth rises and electrical paths get longer.
CPO attacks that problem by placing optical engines extremely close to the switching or compute silicon. NPO keeps the optics nearby rather than directly co-packaging it. In both approaches, shortening high-speed electrical paths can allow more of the longer-distance journey to occur as light through fiber.
PhotonLink Covers the Full Optical Path
Coherent divides PhotonLink into four functions: Generate, Shape, Guide and Receive. Its technology set includes indium phosphide lasers, VCSEL arrays, silicon photonics, isolators, specialty fiber, micro-optics and photodetectors. The company can provide individual components or integrate them into external laser sources, precision fiber assemblies and optical modules.
That integration matters because photonics packaging is a precision-manufacturing problem as much as a chip-design problem. Optical alignment, coupling loss, polarization, thermal behavior and fiber attachment all affect whether a laboratory design can become reliable data-center hardware.
Customer Work Is Already Underway
Coherent says it has more than 10 CPO customer engagements and more than 10 NPO engagements, plus more than five engagements involving emerging chip-to-chip connectivity. The company says it has anchor customers and long-term agreements for both CPO and NPO and expects PhotonLink revenue to begin ramping in the fourth quarter of calendar 2026.
Those are company-reported commercial milestones rather than independent measurements of deployment scale. Still, they show that optical connectivity moving closer to compute silicon is no longer merely a research topic.
Manufacturing Scale Could Be the Hard Part
Coherent says its existing data-center manufacturing base has shipped more than 300 million indium-phosphide lasers and more than one billion InP and gallium-arsenide photodetectors. It is also expanding six-inch InP and specialty-fiber manufacturing capacity for the PhotonLink ramp.
The company is demonstrating other high-bandwidth hardware at ECOC as well, including a 6.4-terabit-per-second NPO optical engine and a 3.2T pluggable architecture. Those products illustrate the broader direction: AI networking is moving toward denser optical links at several levels, from chip-to-chip communication through scale-up and scale-out fabrics to links between data centers.
The Network Is Becoming Part of the AI Computer
For data-center operators, the important shift is architectural. Faster accelerators alone cannot scale AI indefinitely. Power delivery, cooling and networking must advance with them. As optics moves closer to processors, the boundary between a semiconductor package and the network becomes less distinct.
PhotonLink is Coherent’s attempt to supply that transition as a manufacturing platform rather than a single component. If CPO and NPO deployments scale as expected, future AI racks may increasingly treat optical connectivity as part of the compute package itself—not simply as cabling between boxes.
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