Co-packaged optics (CPO) liquid cooling
Co-Packaged Optics Liquid Cooling Cold Plate
High-Channel-Density Copper Cold Plate for CPO & Near-Package Optics
Copper liquid cold plate engineered for high-channel-density optical engines in co-packaged optics (CPO) and near-package optics architectures — where multiple optical channels sit close to the switch ASIC and conventional single-module cold plates no longer fit the layout. Ultrasonically welded, tested at 25 W per channel across 16 channels (400 W total).
Why CPO and near-package optics need a different cold plate
As switch fabrics move from pluggable QSFP-DD/OSFP transceivers toward co-packaged optics, the optical engines move from the faceplate onto (or immediately beside) the switch substrate. Per-module power still runs in the tens of watts, but many channels now sit in a single dense cluster instead of one plate per pluggable module — so the cold plate has to spread heat evenly across a wide, thin, multi-channel footprint rather than cool one module at a time. Industry analysis puts 1.6T-class optical channel power above 30 W as speeds move past 800G, which is pushing the CPO thermal design problem past what air cooling or single-module plates can handle.
Key specifications
| Model | T-HS202331 — ToneCooling optical module liquid cold plate |
|---|---|
| Application | Co-packaged optics (CPO) and near-package optics, high-channel-density optical engines |
| Heat dissipation | 25 W per channel × 16 channels (400 W total) |
| Material | Copper |
| Joining method | Ultrasonic welding (thin-plate construction) |
| Test conditions | 25% PGW coolant, 40°C inlet temperature |
| Flow rate / pressure drop | 1.2 LPM at 7.9 kPa |
| Cold plate surface temperature | ≤52°C |
| Working pressure | 0.6 MPa |
| Dimensions | 416 × 122 × 8 mm |
| CAD / drawings | STEP model and 2D drawing available under NDA — request with your RFQ |
| Validation | CFD flow and thermal simulation; helium leak and proof-pressure testing |
Why ToneCooling
The thin, wide 416 × 122 × 8 mm envelope and ultrasonic-welded copper construction were developed for exactly this kind of dense, multi-channel optical footprint — the same plate family that cools 16 channels across a linear card edge adapts to CPO and near-package layouts where several optical engines cluster around the switch ASIC. Design, engineering, and manufacturing run in-house at the ToneCooling technical center in Guangdong, with CFD simulation and helium leak testing on every unit before it ships.
Applications
Co-packaged optics (CPO) switch platforms, near-package optical engines, and other high-channel-density optical interconnect designs at 400G, 800G, and emerging 1.6T port speeds where multiple optical channels must be cooled as one dense cluster rather than one module at a time.
CPO & Optical Module Liquid Cooling Cold Plate FAQ
Is this the same physical plate as ToneCooling’s pluggable optical module cold plate?
It is the same manufacturing platform — thin ultrasonically-welded copper, 25 W-per-channel rated — configured for the dense, multi-channel layout that CPO and near-package optics need. For a single pluggable QSFP-DD/OSFP module footprint, see the standard optical module liquid cold plate page.
What channel power does this plate support?
Rated at 25 W per channel across 16 channels (400 W total) at the tested condition: 25% PGW coolant, 40°C inlet, 1.2 LPM flow, surface temperature held at or below 52°C.
Can the channel count or layout be customized?
Yes. Channel count, pitch, port location, and the overall footprint are customized from your optical engine or line-card drawing, with CFD simulation validating the design before tooling.
What coolant should be used?
Rated performance is tested with 25% PGW at 40°C inlet. Alternative coolant chemistries are reviewed during DFM against your loop design.
What is the MOQ and lead time?
Prototype MOQ is 5 pieces with a 7–15 business day lead time from approved drawing and PO; production runs 4–6 weeks.
How is quality verified before shipment?
Helium leak testing and proof-pressure testing on the production line, plus flatness and dimensional checks to the acceptance criteria agreed in writing before quotation.
Request a quote
Send your optical engine or line-card drawing, channel count and power, coolant, and flow budget to info@tonecooling.com or use the quote form — the engineering team returns a manufacturable concept with the quotation. MOQ 5 pcs, prototype in 7–15 business days.
Need a Custom Cold Plate for Your Project?
Send us your STEP/PDF file with TDP, coolant type, and flow requirements. Our engineers will deliver a thermal design proposal within 24 hours.
✓ ISO 9001 Certified | ✓ MOQ 5 pcs | ✓ Prototype in 4–6 weeks | ✓ NDA Available
