Introduction:
Compatible 400GBASE-FR4 QSFP-DD optical module is an optical communication device designed for high-speed data centers, supporting 400Gbps transmission rate, using PAM4 modulation technology, working wavelength of 1310nm, and maximum transmission distance of up to 2 kilometers. The module complies with IEEE 802.3bs, QSFP-DD MSA and CMIS 4.1 standards, uses a duplex LC interface, is suitable for single-mode fiber (SMF), and has a built-in digital diagnostic monitoring (DOM) function, which can monitor optical power, temperature and other parameters in real time. Its design is compatible with OEM network equipment, and supports the flexible deployment of third-party optical modules without affecting the original equipment warranty.
How Does 400G FR4 QSFP-DD Work?
The 400G FR4 optics achieve 400G transmission through four-channel coarse wavelength division multiplexing (CWDM) technology, converting 8 50G PAM4 electrical signals into 4 optical signals (each channel has a wavelength of 1271nm, 1291nm, 1311nm, and 1331nm), which are then multiplexed and transmitted through a single optical fiber. The receiving end restores the signal through demultiplexing technology. Its core uses Inphi 7nm or Broadcom 7nm DSP chips to optimize signal processing efficiency, reduce bit error rate (BER ≤2.4E-4), and support low power operation (≤10W). In addition, the module has built-in forward error correction (FEC) function (supported by some models) to further enhance transmission stability.
What are the Advantages of QDD 400G FR4?
High bandwidth and low power consumption:
Through PAM4 modulation and advanced DSP chips, efficient transmission of 50G per channel is achieved, and power consumption is controlled within 10W, significantly reducing data center energy consumption.
Compatibility and flexibility:
Supports compatibility with existing 100G devices. The 400G port can be split into 4 100G ports (such as connecting QSFP28-FR-100G modules) through the split line function, which helps the network upgrade smoothly.
Future Upgrade:
The 400G FR4 QSFP-DD modules enable network operators to seamlessly migrate the existing network to 800G networks. This can be achieved by using a paired QDD 400G FR4 to directly connects to 800G 2FR4 OSFP (dual duplex LC connectors) or 800G 2FR4 QSFP-DD (dual duplex CS connectors) modules through a pair of LC duplex OS2 SMFs or CS to LC duplex OS2 SMFs.
High reliability:
After rigorous spectrum testing, TDECQ testing (typical value 1.68dB) and temperature testing (0~70°C), it ensures stable operation in complex environments.
Long-distance coverage:
The 2km transmission distance is suitable for data center interconnection (DCI), metropolitan area network and enterprise backbone network scenarios, breaking through the distance limitation of multimode optical fiber.
What are the Typical Application Scenarios of 400G QSFP-DD FR4?
Data center leaf-spine architecture: used for the interconnection between core switches and leaf-layer switches, supports high-density 400G port deployment, and improves data throughput efficiency.
Network upgrade and split line application: In a mixed-rate network, the 400G link is split into 4x 100G through the split line function, which is compatible with old equipment and reduces upgrade costs.
Cloud services and supercomputing centers: meet the massive data transmission needs in scenarios such as AI training and big data analysis, and support low-latency and high-concurrency business features.
Summary
OEM compatible 400GBASE-FR4 QSFP-DD optical modules have become key components for the next-generation data center network upgrade due to their high performance, low power consumption and strong compatibility. With the popularization of technologies such as 5G and cloud computing, such modules will continue to play a core role in high-speed interconnection and network elastic expansion, and promote the evolution of digital infrastructure to higher efficiency.
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