400G QSFP-DD
400GBASE-ER4 QSFP-DD 40km Optical Transceiver
400GBASE-ER4 QSFP-DD optical transceiver for up to 40km over duplex single-mode fiber, with four-lane PAM4 optics, host FEC and DDM/DOM.
Specifications
- Warranty
- 3-Years
- Customization
- Free OEM labeling
- Delivery Time
- 48 hours dispatch
Confirm the basic link conditions first.
Designed for engineered long-reach 400GbE links across metro and regional fiber routes.
400G QSFP-DD port
Duplex LC / OS2 fiber
Reach up to 40km
Confirm the host supports a 400GbE QSFP-DD interface.
Verify the connector type and complete single-mode fiber route.
Calculate connector, splice and fiber losses with engineering margin.
Matched interface and optical specifications
Use the verified values below as the engineering baseline. Final deployment still depends on the complete link budget and host configuration.
Axonode part number | A-400G-ER4-40KM |
|---|---|
Ethernet standard | 400GBASE-ER4 |
Form factor | QSFP-DD |
Maximum reach | Up to 40km |
Fiber / connector | OS2 single-mode fiber / Duplex LC |
Host interface | 400GAUI-8, 8 × 53.125Gb/s PAM4 |
Optical interface | 4 × 106.25Gb/s PAM4 |
Lane wavelengths | 1304.58nm, 1306.85nm, 1309.14nm, 1311nm |
Average TX power per lane | +1.5 to +7.1dBm |
OMAouter per lane | +4.5 to +7.9dBm |
Receiver sensitivity | -14dBm OMAouter per lane |
Average RX power per lane | -16.2 to -3.4dBm |
Receiver damage threshold | -2.4dBm per lane |
Extinction ratio / SMSR | 6dB minimum / 30dB minimum |
FEC / monitoring | Host FEC required for maximum reach / I²C DDM |
Power | 3.135 to 3.465V; 12W maximum |
Operating temperature | 0 to +70°C |
Compliance | EU Directive 2015/863/EU |
Typical 400G ER4 deployment
A 40km ER4 link is suited to engineered metro aggregation, regional interconnect and long campus routes between compatible 400G platforms.
Check before order: host model, port mode, coding profile, actual fiber distance, connector and splice losses, and available optical margin.
Deployment considerations
Distance alone does not confirm a reliable link. Verify transmitter output, receiver limits, total route loss and engineering margin. On a low-loss short route, check receiver overload and whether attenuation is required.
Compatibility
Compatibility depends on the exact host platform, port configuration, software version and coding profile. Share the switch or router model for review before ordering.
Frequently Asked Questions
What fiber and connector does this 400G ER4 module use?
It uses duplex LC connections over OS2 single-mode fiber.
Can this 400G QSFP-DD ER4 reach 40km?
Yes, when the complete route stays within the specified optical limits. Actual reach depends on fiber attenuation, connectors, splices and engineering margin.
Is host FEC required?
Yes. Host FEC is required for the maximum supported distance.
What should be checked before deployment?
Confirm the host interface, coding requirements, actual route length, connector and splice losses, transmit power, receiver limits and total optical budget.
Can this long-reach module be used on a short link?
Potentially, but receiver overload must be checked. An optical attenuator may be required when path loss is low.
Does the module support DDM or DOM?
Yes. Digital diagnostic monitoring is available through the I²C management interface.
Is the module universally compatible with every 400G switch?
No. Compatibility depends on the platform, software version, port configuration and coding profile.
What information should I provide for a compatibility review?
Provide the host model, software version, port type, link distance, fiber route and estimated optical loss.
Downloads
The 400G ER4 40km technical datasheet is available on request through the Axonode contact page.
