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News & Technical Notes

Product releases, application notes and exhibition updates from the Dagu engineering and sales team.

2026-09-23Technical Insights

Reading DDM/DOM Data: A Five-Minute Check Before You Accept a Shipment

Digital diagnostics monitoring is built into nearly every modern transceiver, yet it is rarely checked before a shipment is accepted. Five numbers tell you most of what you need to know: temperature, voltage, bias current, Tx power and Rx power.
3 min readRead
2026-09-19Application Notes

QSFP-DD800 or OSFP? Choosing an 800G Form Factor for AI Clusters

Both 800G form factors carry the same 8x100G PAM4 electrical lane structure, so the decision is rarely about speed. Thermal headroom, port density and the switch platform you already run usually settle it.
2 min readRead
2026-09-16Product News

Industrial-Temperature Grades Now Available Across the 1G to 25G Range

Industrial-temperature options covering -40 to +85 °C are now available across our 1G SFP, 10G SFP+ and 25G SFP28 lines, for 5G fronthaul, rail, power utility and outdoor cabinet deployments.
2 min readRead
2026-09-11Company News

CIOE 2026 Wrap-Up: Live 1G-800G Interop Demos in Shenzhen

Our team is back from CIOE 2026 in Shenzhen, where the 1G-800G transceiver line ran in continuous interoperability demos on mainstream switch platforms and most of our time went into answering selection and compatibility questions.
2 min readRead
2026-09-10Product News

800G OSFP and QSFP-DD800 Modules Now in Volume Production at Dagu

Our 800G DR8, SR8 and FR8 modules based on 8x100G PAM4 architecture are now in volume production, targeting AI training clusters and high-performance computing interconnect where port density and power efficiency matter most.
1 min readRead
2026-08-28Technical Insights

Why Gold Finger Plating Quality Decides Transceiver Lifetime

Thickened gold plating on the edge connector is one of the most underrated reliability factors in optical transceivers. We explain how extra-thick gold reduces contact resistance and wear across thousands of insertion cycles.
2 min readRead
2026-08-05Application Notes

Choosing Between 100G LR4, CWDM4 and PSM4 for Metro Links

Three 100G QSFP28 variants cover most metro and data center interconnects, and they are not interchangeable. Here is how to pick between LR4, CWDM4 and PSM4 based on fiber type, distance and what you already have in the ground.
2 min readRead
2026-07-22Application Notes

25G SFP28 BIDI: Doubling 5G Fronthaul Capacity on a Single Fiber

Many 5G fronthaul sites were built with a single fiber strand to the tower. BIDI optics let you move from 10G to 25G without pulling new cable — provided the wavelength pairing and the temperature grade are right.
2 min readRead