400GBASE-ER4 QSFP-DD Compatible Transceiver: 400G-QSFP-DD-42

Our EDGEOPTIC 400G-QSFP-DD-42 is a multi-vendor compatible 400GBASE-ER4 QSFP-DD optical transceiver module designed for extended-reach 400 Gigabit Ethernet applications over single-mode fiber infrastructure. The 400G-QSFP-DD-42 module employs 4-channel LAN-WDM technology operating at narrow wavelength spacing (1304.58, 1306.85, 1309.14, and 1311.43 nm), with each lane transmitting at 106.25 Gbps using PAM4 modulation to achieve an aggregate data rate of 425 Gbps. This dense wavelength arrangement within a 6.85 nm bandwidth enables efficient long-haul transmission over duplex fiber for metropolitan, regional, and carrier-grade network deployments.

Our 400GBASE-ER4 QSFP-DD transceiver utilizes EML (Electro-absorption Modulated Laser) transmitters for each wavelength channel, providing high output power up to +7.1 dBm and precise spectral characteristics required for extended-distance transmission at 100G per lane rates. The receiver section incorporates PIN photodiodes optimized for the narrow LAN-WDM wavelength grid, delivering reliable reception over longer fiber spans. The module ensures a 15.5 dB guaranteed optical link budget, supporting transmission distances up to 40 kilometers over standard single-mode fiber. However, distance is an indicative parameter calculated for identification purposes – ultimately we calculate reach taking into account minimal optical budget and average attenuation characteristics of the deployed fiber plant.

The 400G-QSFP-DD-42 compatible 400GBASE-ER4 module is a hot-pluggable QSFP-DD form factor transceiver with duplex LC/UPC connectors as the optical interface. The electrical interface conforms to QSFP-DD MSA and IEEE 802.3bs specifications, ensuring compatibility with standard QSFP-DD host systems across multiple vendor equipment platforms. Our 400GBASE-ER4 QSFP-DD transceiver can be encoded for compatibility with latest platforms from leading vendors including Cisco, Juniper, Arista, Nokia, Huawei, and other major network equipment manufacturers. The module features built-in Forward Error Correction integrated within the transceiver DSP, eliminating dependency on host-side FEC implementation, and incorporates CDR (Clock and Data Recovery) functionality on all electrical lanes.

The transceiver includes DDM/DOM (Digital Diagnostic Monitoring) capability providing real-time operational parameters including transmitted and received optical power levels per wavelength channel, module temperature, bias current, and supply voltage. This diagnostic data is accessible via the MSA-compatible management interface, enabling comprehensive monitoring of transceiver health and performance. The module operates within a 0 to 70°C commercial temperature range with maximum power consumption of 13W, suitable for deployment scenarios requiring extended reach with moderate power efficiency.

Standards compliance includes IEEE 802.3bs for 400 Gigabit Ethernet and 100G Lambda MSA specifications for the optical interface. The transceiver achieves multi-vendor interoperability through adherence to industry QSFP-DD MSA standards, though equipment with vendor-specific module authentication may require custom EEPROM programming for full compatibility. Our 400GBASE-ER4 QSFP-DD transceiver is CE/RoHS certified and compliant with Class 1 FDA and IEC60825-1 laser safety standards.

Typical applications include metropolitan area network interconnects, inter-data center connections, regional backbone links, campus backbone infrastructure, and carrier-grade deployments requiring high-bandwidth connectivity over extended distances with duplex fiber efficiency. The ER4 architecture provides maximum reach for non-coherent 400G transmission while maintaining the compact QSFP-DD form factor. Because our focus is providing top quality service, we perform comprehensive quality verification before delivery including optical parameter measurements across all wavelength channels, connector cleanliness inspection, and QSFP-DD transceiver EEPROM memory validation tests.