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) |
Key Features of QSFP-DD-400G-FR4 400GBASE-FR4 CWDM
QSFP-DD-400G-FR4 400GBASE-FR4 CWDM belongs to the pluggable optical transceiver family used for high-speed data links. Modules of this class commonly cover form factors such as SFP, SFP+, SFP28, QSFP+, QSFP28 and QSFP-DD, with multimode and singlemode variants for different reach requirements.
Typical Applications of QSFP-DD-400G-FR4 400GBASE-FR4 CWDM
Optical modules of this type are widely used for switch-to-switch links, storage networks, data center interconnects and telecom transmission equipment. Match the module to your switch vendor, wavelength and link distance before ordering.
Selecting QSFP-DD-400G-FR4 400GBASE-FR4 CWDM with BS Comtec
BS Comtec supplies optical transceivers from Huawei, Cisco, Accelink and other brands with global delivery. Send us your switch model, port type and required distance, and we will recommend compatible modules and provide pricing.
Frequently Asked Questions
How do I choose the right QSFP-DD-400G-FR4 400GBASE-FR4 CWDM for my network?
Check your equipment port type, data rate, fiber type (multimode or singlemode), wavelength and link distance. BS Comtec can cross-check these details and suggest compatible options from multiple brands.
Is QSFP-DD-400G-FR4 400GBASE-FR4 CWDM compatible with my switch or router?
Most platforms work with standard-compliant modules, while some vendors apply compatibility lists or coded modules. Share your device model with BS Comtec and we will confirm suitability before shipment.
How is QSFP-DD-400G-FR4 400GBASE-FR4 CWDM packed and delivered?
Modules are shipped in anti-static packaging suitable for international transport. BS Comtec arranges global delivery, and shipping options depend on destination and urgency — contact us for details.
What warranty applies to QSFP-DD-400G-FR4 400GBASE-FR4 CWDM?
Warranty follows the manufacturer’s policy for the specific part number. BS Comtec supports replacement and RMA coordination according to the terms confirmed in your order.
Where is QSFP-DD-400G-FR4 400GBASE-FR4 CWDM typically used?
It is typically used in data centers, enterprise networks, carrier transmission and campus backbones for high-speed fiber connections between switches, routers and storage systems.
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