400GBASE-DR4+ QSFP-DD Compatible Transceiver: 400G-QSFP-DD-2

Our EDGEOPTIC 400G-QSFP-DD-2 is a multi-vendor compatible 400GBASE-DR4+ QSFP-DD optical transceiver module designed for extended-reach 400 Gigabit Ethernet applications utilizing parallel single-mode fiber architecture. The 400G-QSFP-DD-2 module employs 4-lane PSM4 (Parallel Single Mode 4) technology operating at 1310 nm wavelength, with each lane transmitting at 106.25 Gbps using PAM4 modulation to achieve an aggregate data rate of 425 Gbps. This enhanced DR4+ variant extends transmission reach beyond standard DR4 specifications for campus-scale and inter-building data center interconnects.

Our 400GBASE-DR4+ QSFP-DD transceiver utilizes EML (Electro-absorption Modulated Laser) transmitters for each of the four parallel lanes, providing enhanced optical output power characteristics required for extended-distance PAM4 transmission. The receiver section incorporates PIN photodiodes optimized for 1310 nm operation across all lanes with improved sensitivity. The module ensures a 4 dB guaranteed optical link budget, supporting transmission distances up to 2 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-2 compatible 400GBASE-DR4+ module is a hot-pluggable QSFP-DD form factor transceiver with MTP/MPO-12 APC connector as the optical interface, utilizing 8 fibers (4 transmit, 4 receive) for parallel transmission. The electrical interface conforms to QSFP-DD MSA and IEEE 802.3cd specifications, ensuring compatibility with standard QSFP-DD host systems across multiple vendor equipment platforms. Our 400GBASE-DR4+ 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 supports host-side Forward Error Correction 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 lane, 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 12W, requiring appropriate thermal management considerations in high-density deployments.

Standards compliance includes IEEE 802.3cd 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-DR4+ QSFP-DD transceiver is CE/RoHS certified and compliant with Class 1 FDA and IEC60825-1 laser safety standards.

Typical applications include inter-building data center connections, campus backbone links, and distributed computing environments requiring extended parallel fiber reach beyond standard DR4 distances. The DR4+ breakout capability also enables 4x100G connectivity to individual 100GBASE-DR ports at extended distances. Because our focus is providing top quality service, we perform comprehensive quality verification before delivery including optical parameter measurements across all lanes, connector cleanliness inspection, and QSFP-DD transceiver EEPROM memory validation tests.