- All
- Product Name
- Product Keyword
- Product Model
- Product Summary
- Product Description
- Multi Field Search
Views: 399 Author: Anna Publish Time: 2025-10-14 Origin: Site
1. Common 400G QSFP-DD Optical Transceiver Types
1.1 400G QSFP-DD SR8
1.2 400G QSFP-DD DR4
1.3 400G QSFP-DD XDR4
1.4 400G QSFP-DD FR4
1.5 400G QSFP-DD FR8
1.6 400G QSFP-DD LR4
1.7 400G QSFP-DD LR8
1.8 400G QSFP-DD ER8
2. Application Scenarios of 400G QSFP-DD Optical Modules
2.1 400G QSFP-DD Optical Modules for Direct Data Center Connections
2.2 Metropolitan Area Transport Network
2.3 Long-Haul and High-Capacity Transmission Network Scenarios
The continued growth of global data traffic is driving the upgrade of data center networks from 100G to 400G. As a common, efficient, and cost-effective solution for 400G networks, 400G optical transceivers can significantly improve system performance, increase transmission rates, expand bandwidth, and reduce broadband costs.
There are eight common types of 400G QSFP-DD optical transceivers on the market. This section provides a basic introduction to QSFP-DD SR8, QSFP-DD DR4, QSFP-DD XDR4, QSFP-DD FR4, QSFP-DD FR8, QSFP-DD LR4, QSFP-DD LR8, and QSFP-DD ER8 optical transceivers.
The 400G QSFP-DD SR8 is a four-channel, hot-swappable optical module suitable for short-reach interconnects. It supports multimode fiber optic links up to 70m (OM3) or 100m (OM4) via an MPO-16 connector. Compliant with the QSFP-DD MSA specification and IEEE 802.3bs, it includes eight transport channels, each capable of up to 53.125 Gbps (PAM4), enabling 400 Gbps data transmission.
The 400G QSFP-DD DR4 optical module uses an MPO-12 connector at a 1310nm center wavelength to achieve a maximum transmission distance of 500m over single-mode fiber (SMF). DR4 stands for "4-channel dense wavelength division multiplexing (DWDM)," indicating that 400G DR4 optical modules use four channels to transmit data. Each channel can transmit data at a rate of 106.25Gbps (PAM4), for a total transmission rate approaching 425G.
The 400G QSFP-DD XDR4 optical module has a longer transmission distance than the 400G QSFP-DD DR4 module. It supports MTP/MPO-12 connectors for connecting to single-mode devices with a maximum shipping length of up to 10km. It complies with the IEEE 802.3bs protocol and the QSFP-DD MSA standard. It includes four core transmission channels and achieves a total transmission rate of 400G.
The 400G QSFP-DD FR4 (full-duplex, 4-channel, Class 4 interface) is a hot-swappable optical module supporting 400Gbps. It uses LC connectors to support multimode gateways with lengths up to 2km. This 400G FR4 optical module includes four independent channels, each running at 100Gbps on the CWDM4 central wavelength. It complies with the 100G single-wavelength MSA specification and can be used for high-speed data transmission in data centers. Using PAM4 modulation, the single-wavelength transmission rate can reach 106.25Gbps, achieving an aggregate transmission rate of 400G.
The 400G QSFP-DD FR8 utilizes the same 50G PAM4 modulation technology as the 400G QSFP-DD FR4 optical module. It uses eight channels to transmit data, with each channel delivering a transmission rate of nearly 53.125 Gbps, for a total transmission rate of nearly 400 Gbps. Unlike the 400G QSFP-DD SR8 optical module, which is only suitable for short-distance transmission, the 400G QSFP-DD FR8 optical module can be used for medium-distance transmission, with a maximum transmission distance of 2 km.
The 400G QSFP-DD LR4 is an optical module that offers high transmission rates, high bandwidth, and long-distance data transmission, making it suitable for applications such as 400G broadband and data center interconnects. It supports single-mode fiber transmission distances of up to 10 km using an LC connector and complies with the IEEE 802.3bs protocol and the QSFP-DD MSA standard.
The 400G QSFP-DD LR8 uses the same modulation technology (50G PAM4) as the 400G QSFP-DD SR8 and 400G QSFP-DD FR8 optical modules and has eight transmission channels. However, unlike the 400G QSFP-DD SR8 and 400G QSFP-DD FR8 optical modules, the 400G QSFP-DD LR8 optical module can achieve single-mode fiber transmission up to 10 km per channel, with a maximum transmission rate of 106.25 Gbps, for an aggregate transmission rate of 425G.
The 400G QSFP-DD ER8 and 400G QSFP-DD LR8 optical modules share the same transmission rate, modulation technology, and connector. Both are compliant with the IEEE 802.3cn protocol and the QSFP-DD MSA standard. In addition to the above differences, the 400G QSFP-DD ER8 optical module achieves a maximum transmission distance of 40km, making it more suitable for ultra-long-haul data transmission.
As a low-cost, low-power optical connectivity solution for next-generation data centers, the 400G QSFP-DD series optical modules are widely used in data centers, metropolitan area bearer networks, and long-haul, high-capacity transmission networks.
In data center network architectures, connections between servers, between switch modules, and between servers and switches require optical fibers, fiber optic patch cables, or other communication equipment to achieve network data interconnection.
Cloud computing, big data, ultra-high-definition video, the Internet of Things, virtual reality/augmented reality, 5G, artificial intelligence, and intelligent transportation have created new demands for metropolitan area transport networks: ultra-high transmission bandwidth, large-scale data connectivity, ultra-low latency response, and high reliability. As large urban 5G regional networks are deployed, traditional 100GE ports are no longer able to meet the bandwidth requirements of the 5G network's aggregation and core layers. Consequently, core layer bandwidth will be upgraded to 200GE/400GE. 400G optical interconnect solutions are becoming the preferred choice for routers.
With the emergence of new application scenarios in the industry market, the demand for long-haul data transmission is rapidly increasing, further increasing the demand for network transmission bandwidth. Furthermore, internet operators are setting higher standards for flexible network management and modulation. These changing trends are driving the continued expansion of 400G applications in long-haul transmission. A single 400G wavelength can be used to connect 400G ports, allowing wavelength paths to be adjusted according to market demand. This allows for direct wavelength access within optical paths, reducing latency and power consumption.
