QDD-400G-FR4 is a high performance, low cost transceiver with duplex LC connector, which supports transmission distance up to 2km over SM fiber. On the transmitter side, the module converts 8 channels of 50Gbps (PAM4) electrical input data to 4 channels of CWDM optical signals, and multiplexes them into a single channel for 400Gbps optical transmission. On the receiver side, the module optically de-multiplexes a 400Gbps optical input into 4 channels of CWDM optical signals, and converts them to 8 channels of 50Gbps (PAM4) electrical output data. The module incorporates 4 independent channels on CWDM4 1271/1291/1311/1331nm center wavelength, operating at 100G per channel. The module supports commercial operating temperature, and the specification is compliant with 100G Lambda MSA 400G FR4 Technical Specification and the electrical interface is compliant with IEEE 802.3bs and QSFP-DD MSA.
Technical Specification
Compatible OEM |
FIBERTOP |
Compatible With OEM Part Number(s) |
QDD-CW31QG-FR4CL |
Transceiver Type |
CWDM4 |
Reach |
2km |
Wavelength |
1264.5~1277.5 1284.5~1297.5 1304.5~1317.5 1324.5~1337.5
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Form Type |
QSFP-DD |
Speed Description |
400G |
Media |
SMF |
Connector |
Duplex LC |
Extinction Ratio |
> 3.5 dB |
TX Power |
-7.3 ~ +3.5 dBm |
Receiver Sensitivity |
< -4.6 dBm |
Applications |
400GBASE-FR4 Ethernet
400G InfiniBand HDR systems
AI Data Centers
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Environment |
Operating: 0°C to 70°C
Storage: -40°C to 85°C
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Quality Assurance
Quality Certification
FIBERTOP has strict control over all products' quality our products, including our strict qualification audit for material suppliers, comprehensive quality management system and production process control which comply with the certifications and safety standard. Our products accord with industry standard and mainstream quality certification, such as ISO 9001, CE, RoHS, CE, REACH, FCC, FDA, CB, UL etc.
- Excellent quality is the foundation of FIBERTOP' s survival and development.
- Our R&D team are experts with rich experience in telecom industry.
- Our material suppliers are first-class manufacturers in the industry.
- We have the qualification of OEM for first-class system equipment manufacturers.

FIBERTOP provide after-sales service in strict accordance with Chinese Consumer Protection Law & Product Quality Law of the People's Republic of China. The defects liability period is provided for each product based on the materials, workmanship, frequency of use and service life. The return, replacement and repair services are as follows:

Return within 30 days
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Replacement up to 1 year
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Up to 5 years warranty
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Provide relevant information (such as order number, product model, product serial number, product label, etc.)→Describe the problems you meet with →FIBERTOP confirms that the product is complete and still in the warranty period→Send the product back to FIBERTOP repair centre.
Note:The warranty period of the repair or replacement product is based on the longer time,either the remaining warranty period of the original product or ninety days after repair.
When your FIBERTOP products need repairing(RMA-Return Material Authorization ) , please contact your sales consultant to provide timely service to you.
Guarantee repairing in two years : 1.Not man made damage; 2. Product quality issues caused by design defects or material problems.
- The following conditions will not be repaired
• Maintenance center judge as a non FIBERTOP products;
• The appearance of man-made damage;
• End face damage caused by use;
• Inapplicable items listed in the warranty statement.
• FIBERTOP guarantees that all the products are subject to strict quality control from raw materials procurement to production process. According to the problems raised by customers. if it is confirmed that the defective product are caused by raw materials or production process, FIBERTOP will provide repair or replacement services for free ;
• The warranty terms do not cover any damage to the product caused by improper installation, accidental disasters, natural disasters, abuse, misuse, inadequate or excessive power supply, incorrect operation, poor environmental conditions, and any unauthorized disassembly, repair or modification ;
• The warranty also does not apply to second-hand or unauthorized resale of products;
• The FIBERTOP warranty only guarantees that customers can enjoy repair and replacement services when they purchase defective or damaged products ; FIBERTOP is not obliged to compensate or assume responsibility for module damage and repair needs caused by other equipment in use.
• The warranty does not cover problems caused by third-party software or connected related equipment,etc.
FIBERTOP always adheres to the concept of "focus, innovation and progress", and is committed to providing every user with reliable products and enthusiastic services. |
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Net weight
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0.02kg |
Gross Weight(with package) |
0.32kg
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Packing  |
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Package of 1~50 pieces |
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Package of 51~200 pieces |
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Package of 201~400 pieces or more |
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DELIVERY METHOD
FIBERTOP has established long-term cooperation with major global logistics companies to provide distribution services to more than 200 countries and regions.
Receiving Region |
Logistics Type |
Timeliness |
Hong Kong, Macao and Taiwan |
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SF 1~2 days |
FedEx IP 1~3 days |
FedEx IE 4~6 days |
DHL 2~5 days |
Overseas Regions |
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UPS 1~3 days |
FedEx 1~3 days |
DHL 2~5 days |
Note: 1. Timeliness is the estimated delivery time, some remote areas delivery may be delayed, the specific delivery time shall prevail .
2. If you need to specify a logistics company, please contact customer service staff or your sales representative.
FIBERTOP has 20+ years of R&D technology experience and more than 100 successful cases. With rich experience and R&D strength, we have a complete set of services from the core system design to the compatibility design of SFP transceivers and the completion of the final product. We can definitely satisfy our customers' needs through providing customized high-performance products and solutions at the first time.
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Product customization

Label
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Colour
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Model
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Length
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Function
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Scheme Customization
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FIBERTOP focuses on customer-oriented solutions and provides technical support.
We can optimize the design based on your original solutions, and also provide you with a complete network solution ,related products and technical support.
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QSFP56-200G-SR4 Compatible 200GBASE-SR4 Transceiver Module
Q:What is it and what is its main use??
A:This optical module is designed for 400G Ethernet transmission and uses a QSFP-DD form factor. The FR4 designation indicates that it uses four wavelengths, using coarse wavelength division multiplexing (CWDM) technology, to achieve 400G transmission over a pair of single-mode optical fibers. The maximum transmission distance is 2 km.
Main Applications: Primarily used for data center interconnects (for example, connecting switches between racks or floors), data center interconnects (DCIs), and high-performance computing (HPC) networks.