Product Overview
The QSFP-DD-400G-FR4 belongs to Huawei’s 400G series and implements 400Gbit/s transmission over four CWDM wavelengths of 1271, 1291, 1311 and 1331 nm onto a duplex LC singlemode fiber pair, with a documented 2 km reach. Electrically it presents 8×50G PAM4 lanes to the host ASIC inside the QSFP-DD footprint.
The duplex LC interface means 400G can be rolled out over exactly the same singlemode patching used for 100G CWDM4/LR4, with no MPO ribbon or parallel optics migration, which keeps cabling and patch-panel investments intact while multiplying fabric capacity fourfold.
Typical applications include 400G spine-leaf and super-spine interconnects, high-capacity DCI between halls or buildings up to 2 km apart, and 400G uplinks from 100G aggregation layers on Huawei CloudEngine platforms.
- 400GBASE-FR4 over 4 CWDM wavelengths (1271/1291/1311/1331 nm)
- 2 km reach on singlemode fiber per Huawei official 400G series table
- 8×50G PAM4 electrical interface in QSFP-DD footprint
- Duplex LC interface reuses existing singlemode patching plant
- 0°C to +70°C commercial case temperature range
| Rate | 400 Gbit/s (400GBASE-FR4; 8×50G-PAM4 electrical) |
| Interface | QSFP-DD, LC duplex |
| Wavelength | 1271/1291/1311/1331 nm (CWDM4 grid) |
| Reach | 2 km on SMF |
| Fiber | SMF |
| Operating Temperature | 0°C to +70°C (case) |
| Compatibility | Huawei QSFP-DD slots, 400GBASE-FR4 (IEEE 802.3cu/802.3bs class) |
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