800G Optical
800G 2×FR4 Optical Module
2×FR4 combines two 400G FR4 optical links in an 800G-class module. Host support, connector layout and cabling must be confirmed for the target platform.
Core link profile
800G 2×FR4 Optical Module
Dual 400G FR4 optical engines for single-mode, 2 km-class interconnect requirements.
Architecture2×400G FR4
FiberSMF
Reach2 km class*
InterfaceDual duplex optical*
Selection notes
✓Confirm whether the host uses OSFP800 or QSFP-DD800 and supports the required 2×400G mode.
✓Confirm dual-link port mapping before patch-cord selection.
✓Confirm single-mode fiber loss budget and target reach.
✓Confirm native 800G, 2×400G breakout or interoperability requirements.
Connector / cabling note
Connector type and port mapping depend on the exact PN.
Connector type and port mapping depend on the exact PN.
Project validation before quotation
Send the host platform, port type, topology, reach, quantity and required date.
01Platform
02Port / form factor
03Protocol / rate
04Fiber / cable
05Reach
06Quantity / date
Implementation Boundary
2×FR4 is a dual-engine implementation, not a universal 800G connector rule
A current NVIDIA implementation packages two 400G FR4 optical engines inside an 800G Twin-port OSFP module. Other platforms may use different mechanics, port modes or supported optical architectures.
Current NVIDIA example
- 800G Twin-port OSFP with two internal 400G FR4 optical engines.
- Two Duplex LC optical ports, each carrying a 400G wavelength-multiplexed path.
- Single-mode reach up to 2 km in the documented platform implementation.
- Used for supported Quantum-2 / Spectrum-4 switch-to-switch paths in NVIDIA documentation.
What must still be confirmed
- Exact host cage and whether the platform supports the required 2×400G port behavior.
- Connector layout, port mapping and optical patching for the selected PN.
- Protocol, firmware / FEC, CMIS and interoperability requirements.
- Whether the project needs native 800G transport, two 400G logical paths or another architecture.
Architecture boundary: do not treat “2×FR4” as interchangeable with DR8 or with every 800G host. The exact platform, dual-engine mapping and LC fiber path must be confirmed.
2×FR4 Procurement Evidence Pack
Six fields to freeze before quotation
01 / PLATFORMExact host implementationSwitch / appliance model, cage and supported port mode.
02 / ENGINEDual 400G mappingConfirm how the two optical engines map to host ports and topology.
03 / CONNECTORLC port layoutConfirm exact connector count, duplex mapping and patch-panel path.
04 / REACH2 km-class loss pathUse installed route, patch panels and optical loss budget.
05 / VALIDATIONPlatform evidenceFirmware, FEC, CMIS, protocol and sample interoperability result.
06 / SUPPLYQuantity and deliverySample / pilot / volume quantity, alternative policy and target date.
Related product pages
Related product pages
Final PN, compatibility, connector, reach, availability and lead time are confirmed against the actual RFQ.