Which 400G Transceivers Are Most Popular for Data Center Switches?
According to industry market research, 400G QSFP-DD SR4 is among the most widely adopted 400G optical transceiver solutions across data center deployments. It has become a mainstream workhorse for short-reach intra-datacenter links, capturing substantial market demand thanks to mature technology, balanced cost-performance, backward compatibility and broad ecosystem support.
As AI computing clusters and cloud data centers continue to scale up, 400G networking is no longer limited to large hyperscale cloud operators. More enterprise IDCs and mid-to-small scale AI computing projects are upgrading their infrastructure from 100G / 200G to 400G. Among multiple 400G options including DR4, FR4 and LR4, 400G QSFP-DD SR4 gains strong traction for short-distance rack-to-rack interconnections inside data centers.
Product Core Specifications
- Form Factor: QSFP-DD
- Standard: IEEE 802.3bs, QSFP-DD MSA
- Rate: 400Gbps full-duplex, 4×106.25G PAM4
- Wavelength: 850nm VCSEL
- Fiber Type: Multimode Fiber (OM3 / OM4 / OM5)
- Transmission Distance:
- OM3: up to 70m
- OM4 / OM5: up to 100m
- Optical Interface: MPO-12 APC
- Power Consumption: ≤10W
- Digital Diagnostic Monitoring (DDM): Real-time monitoring of Tx/Rx optical power, temperature, supply voltage
- Hot-pluggable, RoHS compliant, Laser Class 1
400G QSFP-DD SR4 works with MPO-12 multimode trunk cable and MPO-12 to LC breakout cable (OM3/OM4/OM5)
- MPO-12 trunk cable: Deployed for horizontal cabling between racks, 12-fiber parallel multimode cable, available in Type A/B polarity.
- MPO12-LC breakout cable: Fans out from MPO-12 connector into 4 pairs of LC duplex connectors, connecting to individual server NIC or top-of-rack switch ports.
Recommendation: OM4/OM5 multimode fiber is commonly selected for new deployments to guarantee stable transmission up to 100m.