400G QSFP112 VR4 Compatible Transceiver: 400G-QSFP112-50

Our EDGEOPTIC 400G-QSFP112-50 is a multi-vendor compatible 400G QSFP112 VR4 optical transceiver module designed for ultra-short-reach 400 Gigabit Ethernet applications over multimode fiber infrastructure. The 400G-QSFP112-50 module employs 4-lane parallel transmission technology operating at 850 nm wavelength, with each lane transmitting at 106.25 Gbps using PAM4 modulation to achieve an aggregate data rate of 425 Gbps. This next-generation QSFP112 form factor delivers 100G-per-lane optical density for maximum bandwidth efficiency in modern hyperscale data center environments.

Our 400G QSFP112 VR4 transceiver utilizes VCSEL (Vertical-Cavity Surface-Emitting Laser) transmitters optimized for 100G-per-lane PAM4 signaling, providing power-efficient optical transmission with reduced lane count compared to SR8 alternatives. The receiver section incorporates PIN photodiodes optimized for high-speed 850 nm reception across all four lanes. The module ensures a 1.7 dB guaranteed optical link budget, supporting transmission distances up to 50 meters over OM4 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, and average attenuation of the deployed multimode fiber plant.

The 400G-QSFP112-50 compatible VR4 module is a hot-pluggable QSFP112 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 QSFP112 MSA, CMIS V4.0, IEEE 802.3db, and IEEE 802.3ck specifications, ensuring compatibility with latest-generation QSFP112 host systems across multiple vendor equipment platforms. Our 400G QSFP112 VR4 transceiver can be encoded for compatibility with latest platforms from leading vendors including Cisco, Juniper, Arista, Nokia, Huawei, and other major network equipment manufacturers deploying next-generation switching infrastructure. 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 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 only 8W, delivering exceptional power efficiency for high-density leaf-spine deployments.

Standards compliance includes IEEE 802.3db for 400GBASE-VR4, IEEE 802.3ck for 400G electrical interface, and 100G Lambda MSA specifications. The transceiver achieves multi-vendor interoperability through adherence to industry QSFP112 MSA standards, though equipment with vendor-specific module authentication may require custom EEPROM programming for full compatibility. Our 400G QSFP112 VR4 transceiver is CE/RoHS certified.

Typical applications include intra-rack interconnects, top-of-rack to leaf switch connections, high-performance computing clusters, and AI/ML training infrastructure requiring ultra-low-latency 400G connectivity over very short distances. The VR4 designation indicates optimized reach for 50m applications within structured cabling environments. Because our focus is providing top quality service, we perform comprehensive quality verification before delivery including optical parameter measurements across all four lanes, connector cleanliness inspection, and QSFP112 transceiver EEPROM memory validation tests.