• 400G QSFP-DD FR4 Optical Transceiver CWDM 2km SMF LC Duplex PAM4

400G QSFP-DD FR4 Optical Transceiver CWDM 2km SMF LC Duplex PAM4

400G QSFP-DD FR4 optical transceiver using CWDM PAM4 technology with LC duplex interface. Supports up to 2km SMF transmission for data center and metro networks.

SKU 400G-QSFP-DD-FR4-2KM Category
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The 400G QSFP-DD FR4 Optical Transceiver is a high-performance single-mode fiber module designed for 400G Ethernet long-reach data center and metro interconnect applications. It utilizes CWDM technology combined with PAM4 modulation to achieve 4×100G electrical-to-optical conversion, delivering an aggregate bandwidth of 400Gbps over distances up to 2km.

Featuring a QSFP-DD form factor and LC duplex interface, this FR4 module provides an efficient solution for point-to-point data transmission where MPO-based parallel optics are not preferred. It is widely deployed in hyperscale data centers, cloud infrastructures, and metro networks requiring simplified cabling and extended reach.
Form FactorQSFP-DD
Data Rate400Gbps
Ethernet Standard400GBASE-FR4
Fiber TypeSingle-Mode Fiber (SMF)
Maximum DistanceUp to 2km
WavelengthCWDM4
Optical TechnologyCWDM PAM4
Modulation FormatPAM4
Optical Configuration4-Channel CWDM Transmission
Optical InterfaceDuplex LC
Optical ComponentsIntegrated MUX/DEMUX
Transmitter TypeCWDM Laser Array
Receiver TypePIN Receiver Array
Electrical Interface8 × 50Gb/s PAM4 (400GAUI-8)
Power SupplySingle +3.3V
Maximum Power Consumption≤10W
Digital MonitoringSupported
Hot Plug CapabilityYes
  • Supports 400Gbps aggregate data rate
  • 4×100G PAM4 electrical/optical lanes
  • CWDM (Coarse Wavelength Division Multiplexing) technology
  • Up to 2km transmission distance over single-mode fiber
  • LC duplex connector for simplified cabling
  • QSFP-DD high-density hot-pluggable form factor
  • Low power consumption optimized for data center environments
  • High signal integrity with low bit error rate
  • Digital Diagnostic Monitoring (DDM) support
  • Compliant with QSFP-DD MSA and IEEE standards
  • RoHS compliant and environmentally friendly design
  • Data center interconnect (DCI) up to 2km
  • Hyperscale cloud infrastructure networks
  • Metro edge aggregation networks
  • AI and high-performance computing clusters
  • Spine-leaf architecture interconnections
  • High-bandwidth enterprise backbone networks

We provide flexible OEM and customization services for global networking projects. Options include customized labeling, EEPROM programming, compatibility coding for major vendors such as Cisco, Arista, Juniper, and NVIDIA, as well as tailored packaging solutions. Engineering-level customization including optical performance tuning, power optimization, and interoperability testing is also available.

Q1: What does FR4 mean in 400G optical transceivers?
A: FR4 refers to four optical lanes using CWDM technology over single-mode fiber with a reach of up to 2km.

Q2: How is FR4 different from DR4?
A: DR4 uses parallel optics with MPO connectors for up to 500m, while FR4 uses CWDM over LC duplex fiber for longer reach up to 2km.

Q3: Why does FR4 use LC duplex instead of MPO?
A: LC duplex simplifies cabling infrastructure and reduces complexity compared to multi-fiber MPO solutions.

Q4: Is PAM4 required for FR4 modules?
A: Yes, PAM4 modulation is used to efficiently transmit 100G per lane over CWDM wavelengths.

Q5: Can this module be used in data center interconnects?
A: Yes, it is widely used for 400G DCI applications requiring up to 2km reach.

Q6: What fiber type is required?
A: Standard single-mode fiber (SMF) is required for proper operation.

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