400G QSFP-DD ER4 30km Optical Transceiver LWDM PAM4 Duplex LC SMF Module

• Supports 400Gbps Ethernet optical transmission
• Designed for 400GBASE-ER4 extended-reach applications
• Supports transmission distances up to 30km over single-mode fiber
• Uses LWDM wavelength multiplexing technology
• Integrates nLWDM laser technology for long-distance optical performance
• Supports PAM4 modulation for high-speed transmission efficiency
• Four optical lanes for 400G parallel transmission
• QSFP-DD high-density hot-pluggable form factor
• Duplex LC connector for standard SMF deployment
• Supports 400GAUI-8 electrical interface with 8 × 53.125Gb/s PAM4 lanes
• Integrated Digital Diagnostic Monitoring (DOM)

• 400GBASE-ER4 Ethernet networks
• Data Center Interconnect (DCI)
• Metro optical networks
• Cloud computing infrastructure
• Enterprise backbone networks
• Long-distance switch-to-switch connections
• High-performance computing networks

FiberMania provides OEM and customized QSFP-DD optical transceiver solutions for cloud providers, telecom operators, data center operators, and networking equipment manufacturers. Customization services include firmware configuration, CMIS parameter programming, EEPROM customization, product labeling, packaging solutions, and host platform compatibility optimization.

What is the difference between 400G QSFP-DD ER4 and LR4 modules?

The main difference is transmission distance and optical technology. LR4 modules are typically designed for approximately 10km links using CWDM wavelengths, while ER4 modules use enhanced LWDM optical technology to extend transmission distances up to 30km over single-mode fiber.

What type of fiber is required for the 400G QSFP-DD ER4 module?

The module requires single-mode fiber (SMF), typically G.652 fiber. The Duplex LC interface allows easy connection to existing single-mode fiber cabling systems used in data centers and telecom networks.

Why does the ER4 module use LWDM technology?

LWDM technology provides narrower wavelength spacing compared with traditional CWDM approaches, enabling optimized wavelength allocation and improved performance for extended-reach 400G optical transmission.

What is the purpose of DOM in this optical module?

Digital Optical Monitoring (DOM) allows real-time monitoring of important operating parameters such as temperature, voltage, transmit optical power, and receive optical power. This helps network operators maintain link reliability and simplify troubleshooting.

Can the 400G QSFP-DD ER4 module be used for data center interconnects?

Yes. With up to 30km transmission capability, Duplex LC connectivity, and high-capacity 400G bandwidth, the ER4 module is well suited for connecting geographically separated data centers and metro-scale optical networks.