SENKO's CPO Playbook: A Connector Maker Is Actually Solving the Same Problem
When Taiwanese companies talk about CPO, the focus is mostly on "components": FOCI makes FAs, Largan makes coupling lenses, Genius Electronic Optical makes molded glass. But the supply chain also has players running on a completely different logic: the connector mindset. SENKO (Senko Advanced Components) is the prime example.
It makes neither chips nor FA substrates; for thirty years it has done just one thing: reliably plug light in and pull it out. As CPO moves the optical engine next to the chip and data centers start demanding "serviceable, replaceable" designs, SENKO is effectively moving its core business straight into the most central position in AI optical communications.
I laid out SENKO's five core patents of recent years that relate directly to CPO and found that, taken apart, they are five separate things, but together they solve the same problem: how to make every "pluggable interface" in CPO, from the chip to the faceplate, reliable, demountable and high-density.
Four common threads across SENKO's patents
Stack the five patents onto a single CPO package and you'll see four shared threads:
Mirror-turned coupling: a mirror turns the light 90° into the PIC, so flat-polished fiber can couple too and the package stays low-profile.
Expanded-beam demountable: microlenses expand the light into a larger spot before mating, relaxing tolerances and enabling a repeatably pluggable, demountable interface.
Blind-mate board attach: guide ramps plus a floating mechanism let the optical engine plug onto the PCB without precise alignment.
VSFF high density: very small form factor, cross-compatible connectors that push fiber density on the switch faceplate to the maximum.
The shared spirit of all four threads comes down to one word: "plug".
Five core patents and their publication status
*(Insert the five-patent comparison table here, taken from Section 6 of the HTML illustrated report)*
Patent 1 | Fiber-to-grating-coupler coupling (US12422629B2 granted · US/WO)
Patent 2 | High-density optical connector and optical module (US20260160954A1 pending · US)
Patent 3 | Optoelectronic-to-PCB connection (US12411298B2 granted · US/WO)
Patent 4 | VSFF connector and adapter (US12585072B2 granted · US/CN/WO)
Patent 5 | Multi-fiber MT ferrule adapter system (US12399329B2 granted · US)
Start with the most technically valuable one: mirror-turned coupling
Silicon photonics grating couplers usually require angle-polished fiber to launch light at a specific angle, which is expensive and hard to assemble. SENKO uses a stamped metal optical bench that forms the mirror and fiber alignment grooves in a single stamping step, and uses a mirror to turn the light 90° into the PIC. The fiber lies flat on the PIC surface (a low-profile package) and can still use inexpensive flat-polished fiber. The patent disclosure claims up to 89% coupling efficiency (about 0.5 dB).
This is the most critical patent in the entire set
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The above is this article's summary of key points.
STT's full analysis (how the five patents fill in every plug-in checkpoint along the "chip → interface → board → faceplate" path, how deep SENKO's connector moat really is, and why the most critical coupling patent lists a Liechtenstein company on Google Patents, and how I traced the assignment chain all the way back to SENKO (the answer has to do with its 2022 acquisition of CudoForm)) is available in full in the paid section, including figure-by-figure breakdowns of all six original schematic diagrams and a combined "time window × technology thread × positioning × risk" assessment table.
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