400G QSFP-DD CWDM4 10KM Optical Transceiver Module
High-performance 400Gb/s optical transceiver with 4-wavelength CWDM technology for metro network connectivity, data center interconnect (DCI), and enterprise backbone applications. The only 400G QSFP-DD solution combining 10km reach with cost-effective LC duplex interface.
- Product Introduction
400G QSFP-DD CWDM4 10KM Optical Transceiver Module
FB-LINK has launched a cost-effective 400G QSFP-DD optical transceiver module suitable for long-distance end-user communication. The 400G QSFP-DD CWDM4 10KM uses a dual-fiber LC single-mode interface and utilizes four CWDM wavelengths (1271/1291/1311/1331nm) for transmission, meeting low power consumption requirements (≤12W). It complies with the 400G-LR4-10 MSA standard and supports 10km transmission.
Using CWDM wavelength
4*100G
1271nm 1291nm 1311nm 1331nm
Applicable Scenarios
Data Center Interconnect (DCI): Interconnection of data centers within a campus or metropolitan area network
Metropolitan Area Network: Metropolitan area access/aggregation layer transmission
≤12W
Power consumption
Duplex_LC
Interface
400G-LR4-10 MSA
Meets standards
10KM
Transmission Distance
What Makes This 400G CWDM4 Module Different
Purpose-built for metro networks and DCI applications where extended reach and fiber efficiency are critical requirements
Transmits 4×100G channels (1271/1291/1311/1331nm) on a single fiber pair using Coarse Wavelength Division Multiplexing-unlike parallel optics that need 8-12 separate fibers.
- 4λ CWDM Channels
- 75% Fiber Reduction
10KM Metro-Scale Reach
Extends 400G connectivity to 10 kilometers-20× farther than DR4 (500m) and 5× farther than FR4 (2km). Ideal for campus backbone, building-to-building links, and metro DCI.
- 10km Max Distance
- 20× vs DR4 Reach
Standard LC Duplex Interface
Uses widely-deployed LC duplex connectors-not expensive MPO/MTP. Leverage existing single-mode fiber plant without connector upgrades or specialized patch cables.
- 2 Fiber Strands
- 50% Cable Cost Savings
Why CWDM4 Technology for 400G Metro Networks
Coarse Wavelength Division Multiplexing (CWDM) enables 400G transmission over standard single-mode fiber infrastructure without the fiber count penalty of parallel optics solutions.
Fiber Infrastructure Efficiency
Use existing 2-fiber SMF runs instead of 8-12 fiber parallel solutions-critical for metro networks where fiber is expensive or limited
Cooled EML Laser Technology
Temperature-stabilized Electro-absorption Modulated Lasers ensure wavelength accuracy and long-term signal stability across operating conditions
Built-in MUX/DEMUX
Integrated optical multiplexer/demultiplexer combines and separates 4 wavelength channels-no external passive components required
100G Lambda MSA Compliant
Full compliance with 400G-LR4-10 MSA specification ensures multi-vendor interoperability and future upgrade path
400G QSFP-DD Module Comparison: CWDM4 vs DR4 vs FR4
Choose the right 400G transceiver for your specific deployment scenario
| Parameter | CWDM4 10KM (This Product) | DR4 500m | FR4 2KM |
|---|---|---|---|
| Transmission Distance | 10km Best | 500m | 2km |
| Optical Technology | 4λ CWDM MUX (1271-1331nm) | 4× Parallel 1310nm | 4λ CWDM MUX (1271-1331nm) |
| Connector Type | LC Duplex Most Common | MPO-12 | LC Duplex |
| Fiber Count | 2 fibers Lowest | 8 fibers | 2 fibers |
| Power Consumption | ≤12W | ≤10W Lowest | ≤14W |
| Best Application | Metro DCI, Campus Backbone, Enterprise WAN | Intra-DC Spine-Leaf | Inter-Building, Short DCI |
| Fiber Cost Impact | Low (existing LC plant) | High (MPO infrastructure) | Low (existing LC plant) |
Recommendation: Choose CWDM4 10KM for metro/campus networks requiring extended reach. Choose DR4 for high-density intra-DC links where 500m is sufficient. Choose FR4 for short inter-building connections under 2km.
400G QSFP-DD CWDM4 10KM Specifications
Complete technical parameters for system integration and network design
General Specifications
| Form Factor | OSFP-DD (Double Density) |
| Data Rate | 4×100G (400Gb/s aggregate) |
| Wavelength | 1271/1291/1311/1331nm (CWDM) |
| Transmission Distance | Up to 10km |
| Connector | Duplex LC |
| Fiber Type | G.652 Single-Mode Fiber (SMF) |
| Modulation | PAM4 (8×53.125Gb/s electrical) |
Optical Characteristics
| Transmitter Type | Cooled EML (4-channel) |
| Receiver Type | PIN Photodiode (4-channel) |
| Tx Power (per lane) | -2.8 ~ 5.3 dBm |
| Rx Sensitivity | -9.1 dBm (min) |
| Extinction Ratio | ≥3.5 dB |
| Link Budget | >6 dB |
Electrical & Environmental
| Power Consumption | ≤12W (typical 10W) |
| Supply Voltage | +3.3V single supply |
| Operating Temperature | 0°C to +70°C (Commercial) |
| Storage Temperature | -40°C to +85°C |
| Humidity | 5% to 95% (non-condensing) |
Standards & Compliance
| MSA Compliance | OSFP-DD MSA Rev 5.0+ |
| Optical Standard | 100G Lambda MSA 400G-LR4 |
| Management | CMIS 5.0 (DDM/DOM supported) |
| Safety | IEC 60825-1 Class 1 Laser |
| EMC/RoHS | CE, FCC Part 15, RoHS 3.0 |
| Warranty | 5 Years Standard |
400G QSFP-DD CWDM4 Switch Compatibility
FB-LINK 400G QSFP-DD CWDM4 10KM modules are tested and verified compatible with leading networking platforms. We provide free custom EEPROM coding for seamless plug-and-play operation.
| Vendor | Compatible Platforms | Minimum Software | Part Number Coding |
|---|---|---|---|
| Cisco | Nexus 9316D-GX, 9332D-GX, 93600CD-GX, 9408, 9500 series | NX-OS 10.2(1)+ | QDD-400G-LR4-S |
| Arista | 7800R3, 7500R3, 7280R3, 7280CR3 series | EOS 4.25.x+ | QDD-400G-LR4 |
| Juniper | QFX5220, QFX5230, QFX5240, PTX10001/10003/10008 | Junos Evolved 21.2R1+ | QDD-400G-LR4 |
| Huawei | CloudEngine CE9860, CE8800, CE6800 series | V200R020C00+ | QSFP-DD-400G-LR4 |
| H3C | S12500X-AF, S9850 series | Comware 7.x | QSFP-DD-400G-LR4-H3C |
| Dell EMC | PowerSwitch S5448F-ON, Z9332F-ON, Z9432F-ON | OS10 10.5+ | QSFP-DD-400G-LR4 |
Why Choose FB-LINK for 400G Optical Transceivers
90% Same-Day Shipping
Extensive inventory of 400G QSFP-DD CWDM4 modules ready for immediate dispatch. Express shipping options worldwide.
Free Custom Coding
Complimentary EEPROM programming for Cisco, Arista, Juniper, and all major switch vendors. 24-48 hour turnaround.
5-Year Warranty
Industry-leading warranty coverage with advance RMA replacement. Free lifetime technical support included.
Global Support Network
5 regional service centers supporting 300,000+ enterprise customers across 200+ countries. 24/7 technical assistance.
FAQ
Q: What is the difference between CWDM4 and LR4 for 400G transceivers?
A: CWDM4 and LR4 often refer to the same optical technology for 400G-both use 4 CWDM wavelengths (1271/1291/1311/1331nm) for 10km transmission. The terms are sometimes used interchangeably; our 400G QSFP-DD CWDM4 10KM module complies with the 100G Lambda MSA 400G-LR4-10 specification.
Q: Can I use 400G CWDM4 modules with existing LC fiber infrastructure?
A: Yes, 400G QSFP-DD CWDM4 transceivers use standard LC duplex connectors and work with existing G.652 single-mode fiber runs. No special fiber types or connector upgrades are required-you can leverage your current 10G/40G/100G LC fiber plant.
Q: What is the power consumption advantage of CWDM4 vs coherent 400G?
A: Our 400G QSFP-DD CWDM4 consumes ≤12W versus 15-24W for coherent 400G ZR/ZR+ modules. For metro DCI under 10km, CWDM4 provides significant power and cost savings while delivering the required reach-coherent technology is better suited for 80km+ applications.
Q: Is FEC required for 400G CWDM4 links?
A: Yes, 400G CWDM4/LR4 links require host-side Forward Error Correction (FEC)-typically KP4 RS(544,514) FEC performed by the switch ASIC. The module itself does not include built-in FEC; this is consistent with the IEEE 802.3bs and 100G Lambda MSA specifications.
Q: Can 400G CWDM4 interoperate with other 400G-LR4 modules?
A: Yes, FB-LINK 400G QSFP-DD CWDM4 modules are fully compliant with 100G Lambda MSA 400G-LR4 specification, ensuring interoperability with any MSA-compliant 400G-LR4 transceiver from other vendors including Cisco, Arista, Juniper, and third-party suppliers.
Q: What fiber cleaning requirements apply to 400G CWDM4?
A: PAM4 signaling at 400G is more sensitive to optical impairments than NRZ. We recommend cleaning all LC connectors with lint-free wipes and 99% IPA before installation. Use inspection scopes to verify cleanliness-contamination can cause BER degradation at extended distances.
Ready to Deploy 400G CWDM4 10KM Transceivers?
Contact FB-LINK for wholesale pricing, custom coding services, and technical consultation for your metro DCI or campus backbone project.
Related 400G Optical Transceiver Products
Explore our complete 400G QSFP-DD portfolio for different reach requirements
500m | MPO-12 | 4×100G Parallel | ≤10W
100m MMF | MPO-12 | InfiniBand Compatible
100G-3.2T | Long-Haul Coherent | DWDM
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