CPO Lasers Don't Have to Chase 400 mW: NPO With Built-In Lasers Brings the Bar Back to Taiwan's Home Turf
The standard answer for a CPO light source is the external laser ELSFP: 200 mW out of the module, 300–400 mW required at the chip, and only a handful of companies such as Lumentum and Coherent can make it in volume.
At ECOC 2026, Ryan Yu of TeraHop, a subsidiary of Innolight, demonstrated another path: putting the laser directly inside the NPO. Removing the front-panel ELSFP, the polarization-maintaining fiber, and a set of connectors cuts about 3 dB of loss from the optical path, so laser power can drop a notch. With an entire row of light-source slots gone from the front panel, the switch may even shed 1U.
At the same ECOC, Lumentum, which sells high-power lasers, spelled out the specs itself: CPO needs 25–26 dBm (about 316–400 mW), while NPO needs only 21–23 dBm (about 126–200 mW). A 3–4 dB difference in the bar produces a completely different list of who can supply, and the volume sweet spot of Taiwan’s CW laser chain (70–100 mW) sits right at the door of the NPO window.
Inside the premium section
A full breakdown of the two light-source routes, and where that 3 dB comes from
Mechanical breakdown: how removing the ELSFP shrinks the switch from 2U to 1U
Energy breakdown: the laser segment drops from about 2.5 to about 0.85 pJ/bit, plus NVIDIA’s 30 W / 9 W breakdown and Coherent’s measured 4.7 pJ/bit
Reliability: TeraHop’s shipment data, plus the line on Lumentum’s slide, laser FIT << module FIT
CW laser power map: the 21–23 dBm and 25–26 dBm windows, and where each vendor’s published power falls
The light-source leaders’ own roadmaps: Coherent puts “built-in laser” in the next box of its evolution chart, plus the 2031 crossover point
Taiwan’s supply chain: how 7 Taiwanese companies divide up the whole InP chain, and why InP has no consumer-grade rescue like VCSEL had
Counterarguments: Coherent’s four reasons for external lasers, NVIDIA’s position, and how long the timeline could stretch
Four signals to watch
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That’s the summary of this piece.
STT’s full analysis, covering how the CW laser supply chain will reshuffle once the laser power bar drops 3–4 dB and where Taiwanese companies’ real opportunities and bottlenecks lie, is in the premium section, with 7 original charts.
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This article is for technology and industry trend analysis only and does not constitute investment advice.
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