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Cisco QDD-2X400G-FR4 Compatible 800GBASE-2FR4 QSFP-DD PAM4 1270 to 1330nm 2km DDM Dual Duplex CS/UPC SMF Optical Transceiver Module

Product No :102577
US$ 1598.90  US$ 3999.00
Transceivers type
136 in real-time stock, 20Jul, 2024

Free Shipping over US$ 79.8

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1. 8 optical channels, dual CS duplex connectors 
2. Support 800G to 2x 400G-FR4 QSFP-DD application, no breakout cables required
3. 8x 106.25G PAM4 modulation
4. EML + PIN Laser 
5. Max power consumption ≤18W
See more


Cisco QDD-2X400G-FR4 Compatible 2x 400GBASE FR4 QSFP-DD PAM4 Optical Transceiver Module (1271nm, 1291nm, 1311nm, 1331nm, 2km, Dual Duplex CS, SMF, 0℃ to +70℃, DDM)


Cisco QDD-2X400G-FR4 Compatible 2x 400G FR4 QSFP-DD 800G transceiver module supports a max data rate of 850Gbps. It enables the fiber link of 2km over single-mode fiber (SMF) with dual duplex CS connectors. The 800 Gigabit Ethernet signal is carried over 4 wavelengths at 1271nm, 1291nm, 1311nm, and 1331nm. QSFPTEK manufactured  2x 400GBASE FR4 QSFP-DD complies with IEEE 802.3cu-2021, IEEE P802.3ck D3.0, QSFP-DD MSA HW Rev 6.01, CMIS Rev 5.0. DDM (digital diagnostics monitoring) function is supported on the 800G fiber optic transceiver to achieve real-time operating parameters monitoring. Adopting the Pulse-amplitude Modulation (PAM4) modulation, the FR4 QSFP-DD achieves 800 Gigabit Ethernet through 8x 106.25 PAM4 Retimed 2x400GAUI-4 C2M electrical interface. The 800G FR4 QSFP-DD is widely used for gigabit Ethernet, data centers, and 800G to 2x 400G applications.


Part Number QT-QSFP-DD-800G-2FR4 Vendor Name QSFPTEK
Form Factor QSFP-DD Max Data Rate 850 Gbps (8x 106.25 Gbps)
Wavelength 1271nm, 1291nm, 1311nm and 1331nm Distance 2km
Connector Dual CS Duplex Cable Type SMF
Transmitter Type EML Receiver Type PIN
TX Power -3.2-4.4dBm Receiver Sensitivity -7.7dBm
Power Consumption ≤18W Modulation Format PAM4
DDM Yes Temperature 0 to 70°C (32 to 158°F)
Protocols IEEE 802.3cu-2021, IEEE P802.3ck D3.0, QSFP-DD800 MSA HW Rev 6.01, CMIS Rev 5.0 Warranty 5 Years
Quality Testing Program
Quality Certifications


  • 1. Advanced Technology
    Features PAM4 modulation technology and built-in DSP chip.
  • 2. Best Price and High Quality
    Based on self-producing capacity and rigorous testing, QSFPTEK can provide cost-effective products with high reliability and performance at a trade price.
  • 3. Protocols
    Complies with IEEE 802.3cu-2021, IEEE P802.3ck D3.0, QSFP-DD MSA HW Rev 6.01, CMIS Rev 5.0 standard.
  • 4. Quality Certifications
    Backed by CE, FCC, ROSH, ISO9001.


Scenario 1: 800G to 800G Direct Connectivity




Scenario 2: 800G to 2x 400GE Connectivity


Related Products:

QDD-400G-FR4-S 400GBASE-FR4 QSFP-DD 2km 1310nm SMF Transceiver Module


Product details

8x 100Gbps PAM4 Modulation Technology


Utilize 8x electrial lanes and 8x optical lanes modulated at 100G PAM-4 per lane. On the output side, it convert 8x 106.25Gb/s electrical signal to 8x 106.25Gb/s optical signals. On the receiver side, it convert 8x 100Gb/s optical signal to 8x 100Gb/s electrical signals.




Easy 800G to 2x 400G breakout with OS2 SMFs


The QSFP-DD-800G-2FR4 module is designed with dual duplex CS connectors, while each connector can connect to a physically separate 400G FR4 module via a CS to LC OS2 duplex single-mode fiber. This enables 800G to 2x 400G breakout links without the need for using breakout fiber optic cables. 




Various Switch Tests


Every module is quality tested for compatibility in the multi-brand switches environment, which guarantees flawless operations.


QSPFTEK LAB All Brands Switches Show



Tested in The Host Device to Prove Interoperability


Every unit sold undergoes rigorous quality testing, to ensure compatibility in the target switch environment, guaranteeing perfect operation.





Comprehensive Testing


Every module is qualified through rigorous procedures and advanced equipment to ensure high-quality and reliable optical devices for you.


QSFPTEK Test Devices



800G Optical Transceievers Contrast Table


Part Number





Center Wavelength


1271nm, 1291nm, 1311nm and 1331nm

1271nm, 1291nm, 1311nm and 1331nm



Dual LC Duplex

Dual CS Duplex

Cable Distance (Max.)





8x 106.25G PAM4

8x 106.25G PAM4

8x 106.25G PAM4

Transmitter + Receiver Type




TX Power

-2.9~4.0 dBM

-3.2~4.4 dBM

-3.2~4.4 dBM

Receiver Sensitivity

<-5.9 dBM

-7.2 dBM