400GBASE-SR4.2 BiDi QSFP-DD Compatible Transceiver: BIDI-400G-QSFP-DD-150

Our EDGEOPTIC BIDI-400G-QSFP-DD-150 is a multi-vendor compatible 400GBASE-SR4.2 BiDi QSFP-DD optical transceiver module designed for high-capacity 400 Gigabit Ethernet applications over multimode fiber infrastructure with reduced fiber count. The BIDI-400G-QSFP-DD-150 module employs innovative bidirectional WDM technology utilizing dual wavelengths at 850 nm and 900 nm, transmitting and receiving simultaneously on each fiber to achieve an aggregate data rate of 425 Gbps using PAM4 modulation. This BiDi architecture enables 400G connectivity over just 4 multimode fibers instead of the 8 or 16 fibers required by conventional parallel approaches.

Our 400GBASE-SR4.2 BiDi QSFP-DD transceiver utilizes VCSEL (Vertical-Cavity Surface-Emitting Laser) transmitters optimized for both 850 nm and 900 nm wavelength bands, providing cost-effective and power-efficient optical transmission over OM5 wideband multimode fiber. The receiver section incorporates PIN photodiodes with wavelength-selective filtering to separate the bidirectional signals on each fiber. The module ensures a 2 dB guaranteed optical link budget, supporting transmission distances up to 150 meters over OM5 multimode fiber. However, distance is an indicative parameter calculated for identification purposes – ultimately we calculate reach taking into account minimal optical budget, modal bandwidth characteristics at both wavelengths, and average attenuation of the deployed wideband multimode fiber plant.

The BIDI-400G-QSFP-DD-150 compatible 400GBASE-SR4.2 module is a hot-pluggable QSFP-DD form factor transceiver with MTP/MPO-12 APC connector as the optical interface, utilizing only 4 fibers for full-duplex 400G transmission through bidirectional wavelength division. The electrical interface conforms to QSFP-DD MSA, CMIS V4.0, IEEE 802.3cm, and IEEE 802.3bs specifications, ensuring compatibility with standard QSFP-DD host systems across multiple vendor equipment platforms. Our 400GBASE-SR4.2 BiDi 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, module temperature, bias current, and supply voltage. This diagnostic data is accessible via the CMIS-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, suitable for high-density deployments where fiber conservation is prioritized.

Standards compliance includes IEEE 802.3cm for 400GBASE-SR4.2 and IEEE 802.3bs for 400 Gigabit Ethernet. 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-SR4.2 BiDi QSFP-DD transceiver is CE/RoHS certified and compliant with Class 1 FDA and IEC60825-1 laser safety standards.

Typical applications include data center interconnects leveraging existing OM5 wideband multimode infrastructure, environments requiring fiber count reduction, and deployments where structured cabling constraints favor lower fiber utilization. The SR4.2 BiDi architecture provides migration path efficiency for facilities upgrading from 100G SR4 with existing MPO-12 patch panels. Because our focus is providing top quality service, we perform comprehensive quality verification before delivery including optical parameter measurements across both wavelength bands, connector cleanliness inspection, and QSFP-DD transceiver EEPROM memory validation tests.