400GBASE-FR4 QSFP-DD Compatible Transceiver: 400G-QSFP-DD-2.1

Our EDGEOPTIC 400G-QSFP-DD-2.1 is a multi-vendor compatible 400GBASE-FR4 QSFP-DD optical transceiver module designed for high-capacity 400 Gigabit Ethernet applications over single-mode fiber infrastructure. The 400G-QSFP-DD-2.1 module employs 4-channel CWDM technology operating at 1271, 1291, 1311, and 1331 nm wavelengths, with each lane transmitting at 106.25 Gbps using PAM4 modulation to achieve an aggregate data rate of 425 Gbps. This architecture delivers cost-effective wavelength multiplexing for short-reach data center interconnects requiring duplex fiber connectivity.

Our 400GBASE-FR4 QSFP-DD transceiver utilizes EML (Electro-absorption Modulated Laser) transmitters for each wavelength channel, providing precise optical characteristics required for CWDM transmission at 100G per lane rates. The receiver section incorporates PIN photodiodes optimized for the CWDM wavelength grid spanning 1264.50 to 1337.50 nm. 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-2.1 compatible 400GBASE-FR4 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-FR4 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 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 10W, requiring appropriate thermal management in high-density deployment scenarios.

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-FR4 QSFP-DD transceiver is CE/RoHS certified and compliant with Class 1 FDA and IEC60825-1 laser safety standards.

Typical applications include intra-data center interconnects, spine-leaf fabric connections, storage area network links, and high-performance computing cluster deployments requiring high-bandwidth connectivity over short distances. The FR4 specification provides an optimal balance between reach capability and cost efficiency for campus and building-scale deployments. 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.