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400G QSFP-DD LR4
400G Optical Transceiver

400G QSFP-DD LR4

SKU / P/N: PHOS-4Q2FSL410LC1
400G LR4 optical transceiver for AI data center, GPU cluster, reseller and system-integrator projects.
Data Rate
425Gbps
Form Factor
single-port QSFP-DD
Standard
LR4
Reach
10km @ SMF
Connector
LC connector
Max Power
12W
Spot Available Lead time: 2–4 weeks
Bulk package:
Custom Quote
Custom bulk order? Beyond 2000 pcs, mixed models or annual supply — use Custom Quote to negotiate your discount offline.

Bulk availability changes frequently. Discounts shown are indicative volume tiers — submit an RFQ to confirm the latest price, lead time and allocation. Prices are provided by quote — no public list price.

Link-up guaranteedCoded to any switch / NIC platform
Lifetime warrantyAdvance replacement
Ships from US warehouseFast, no import hassle
Per-unit testedTest report + power-on video

Product description

Generic 400G-LR4 QSFP-DD PAM4 optical transceiver — single-mode fiber, 1310 nm, 10 km, duplex LC/UPC, DOM.

With a duplex LC/UPC interface, the 400GBASE-LR4 transceiver reaches up to 10 km over single-mode fiber, complying with IEEE 802.3bs and the 400GAUI-8/CEI-56G-VSR-PAM4 standards.

The 400G Ethernet signal is carried over four CWDM wavelengths, with multiplexing and demultiplexing handled inside the module.

Product highlights

  • Integrated low-power DSP for stable performance at scale
  • Optimized power budget, max power consumption 12W
  • Compliant with QSFP-DD MSA and IEEE802.3bs standards
  • Supports breakout to lower-rate links for flexible fabric design
  • Backward compatible with existing QSFP form-factor ports
  • Tested on live switch / NIC platforms to ensure performance, quality and reliability

Applications

  • AI data center & GPU cluster interconnect
  • Spine-leaf switching fabric
  • Data center interconnect (DCI) and campus links
  • Hyperscale, cloud and high-performance computing networks

Supply status meaning

In stock or short-notice availability

Data Rate425Gbps
Max Data Rate8x53.125Gbps
Form Factorsingle-port QSFP-DD
StandardLR4
Lanes8
Rate per Lane53.125Gbps PAM4
Reach10km@SMF
MediaSMF
Fiber Typesingle-mode fiber (SMF)
ConnectorLC connector
Wavelength1271nm,1291nm,1311nm,1331nm
Max Power12W
Operating Temperature0 to 70C (32 to 158F)
Optical Modulation4x100G-PAM4
Electrical Modulation8x50G-PAM4
FECInbuilt FEC: Yes
IEEE ComplianceIEEE802.3bs
MSA ComplianceQSFP-DD MSA
ProtocolsQSFP-DD MSA,IEEE 802.3bs,CMIS4.0
Host Interfacesingle-port QSFP-DD
Warranty5

Four bulk tiers — the larger the volume, the better the discount. Actual pricing is confirmed by RFQ based on quantity, customer tier and lead time; there is no single-unit retail.

PackageQuantityVolume discountBest for
Starter Pack 100 pcs Base bulk price Trial order / small channel Request Quote
Growth Pack 500 pcs Save ~5% vs. Starter Reseller / regular supply Request Quote
Project Pack Popular 1000 pcs Save ~10% vs. Starter AI data center project Request Quote
Strategic Pack 2000 pcs Save ~15% vs. Starter Annual / channel agreement Request Quote
Custom bulk order 2000+ pcs Negotiated offline Annual / strategic supply Contact Sales

Ask a compatibility question

Need this model to match a specific switch, NIC or OEM coding? Send us the platform and we'll confirm compatibility and coding options.

  • Compatible coding for major switch / NIC platforms on request
  • Alternative model recommendations
  • Breakout and cabling guidance

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