Univiso 400GBase-QSFP-DD LR4 10km (SMF, 1310nm, LC)
As global demand for high-speed, high-capacity networks continues to surge, 400G optical transceivers are playing a crucial role in enabling next-generation data centers and telecom infrastructure. Among these solutions, the 400GBASE-LR4 QSFP-DD transceiver stands out as a powerful, long-range, and efficient module designed to support 10km optical transmission over single-mode fiber (SMF). This article explores the key features, working principles, and advantages of the 400G QSFP-DD LR4 transceiver and its applications in high-speed network deployments.
The 400GBASE-LR4 QSFP-DD (Quad Small Form-factor Pluggable Double Density) transceiver is an optical module that supports data transmission at 400 Gbps over a distance of up to 10 kilometers using duplex LC connectors and single-mode fiber. It is fully compliant with IEEE 802.3bs 400GBASE-LR4 and QSFP-DD MSA standards.
The module utilizes four lanes of PAM4-modulated 100G optical signals, each transmitted over a distinct wavelength within the LAN-WDM spectrum (typically 1264.5nm to 1337.5nm). These four optical signals are multiplexed and demultiplexed within the transceiver, enabling efficient 400G transmission through just two optical fibers.
Data Rate: 400 Gbps aggregate bandwidth
Transmission Distance: Up to 10 km over SMF
Optical Interface: Duplex LC connectors
Modulation Technology: PAM4 (4-level Pulse Amplitude Modulation)
Wavelength Range: LAN-WDM (1264.5nm to 1337.5nm)
FEC Support: RS-FEC on the host side to correct errors from PAM4 modulation
Low Power Consumption: Typically <12W, suitable for high-density data center environments
Hot-Pluggable: Enables easy upgrades and replacements without shutting down the system
Compliance: IEEE 802.3bs, QSFP-DD MSA, and CMIS (Common Management Interface Specification)
The 400GBASE-LR4 QSFP-DD transceiver operates by converting 8 electrical lanes of 50Gbps (PAM4) into 4 optical lanes of 100Gbps using LAN-WDM wavelengths. On the transmitter side, an integrated multiplexer (MUX) combines the four optical signals, which are then sent through SMF via an LC connector.
On the receiving end, the module employs a demultiplexer (DEMUX) to separate the incoming signal into four wavelengths, which are then converted back to electrical signals and passed to the host device. Forward Error Correction (FEC) is applied to ensure data integrity, compensating for signal distortion and losses over long-distance transmission.
400GBASE-LR4 transceivers are ideal for:
Data Center Interconnects (DCIs): Connecting hyperscale data centers across campuses or cities
Metro Ethernet Networks: Enabling high-speed connections between metro core and aggregation layers
Telecom Backbone: Supporting long-haul communication in telecom networks
Cloud Infrastructure: Scaling bandwidth for AI/ML workloads and large-scale distributed systems
Compared to earlier generation 100G or 200G modules, 400G QSFP-DD LR4 transceivers offer:
Higher Bandwidth Efficiency: 4x the data rate in the same or smaller footprint
Lower Cost per Bit: Reduced CAPEX and OPEX with high-density deployment
Future-Proofing: Support for growing bandwidth demands in cloud, AI, and 5G ecosystems
Interoperability: Seamless integration with routers, switches, and servers from leading vendors
The 400GBASE-LR4 QSFP-DD optical transceiver is a critical enabler of next-generation network transformation, offering high-speed, long-distance, and cost-effective connectivity. As data centers and telecom providers evolve toward 400G and beyond, the adoption of 400G QSFP-DD LR4 modules will accelerate, ensuring reliable and scalable performance for bandwidth-intensive applications.
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