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    Home / Products / Transceivers / 400G/800G/1.6T Ethernet Transceivers / 400G QSFP-DD / 100162

    Cisco QDD-400G-FR4-S Compatible 400GBASE-FR4 QSFP-DD PAM4 DDM 2km 1310nm Duplex LC/UPC SMF Optical Transceiver Module

    Product No: 100162
    7 Reviews
    409 Sold
    US$ 560.90
    Compatible
    Transceivers type
    25 in real-time stock, 25 Aug, 2026

    Free Shipping over US$ 79.8

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    5-Year Warranty 1-Year Exchange
    Warranty
    Providing industry-leading limited lifetime warranty.
    Please check our warranty policy for details.
    Returns & Exchange
    Exchanges caused by the customer's reasons will not be accepted.
    Please ensure that the item you're returning is repackaged with all the cords, adapters, and documentation included when you receive it.
    Please check our Return Policy for details.
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    Add to Cart Bulk Order Quotes 
    1. PAM4 modulation technology.
2. CWDM EML + PIN, Duplex LC connector.
3. Low power consumption ≤12W.
4. 400GAUI-8/CEI-56G- VSR- PAM4, four CWDM optical lanes
5. Applied in 400G Ethernet, Infiniband interconnects, DCI, etc.
    See more

    Specifications

    Cisco QDD-400G-FR4-S Compatible 400GBase-FR4 QSFP-DD Transceiver (SMF, 1310nm, 2km, LC, DDM, 0 to 70C)

     

    Cisco Compatible QDD-400G-FR4-S delivers a max link length of 2km over single-mode fiber (SMF) with a duplex LC connector. The 400GBASE-FR4 transceiver is designed with a QSFP-DD form factor, which provides the industry's highest bandwidth of 400 Gigabit Ethernet (400GbE). The total 400G signal is carried over four CWDM grid optical wavelengths with a data rate of 106.25Gbps (PAM4) per channel. On the transmitter side, the FR4 converts the 8 lanes of 50G PAM4 electrical signals into 4 channels of CWDM optical signals, then Multiplex them into a single 400G signal. On the receiver side, the module will demultiplex the 400G input signal into 4 lanes of CWDM optical signals and convert them into 8 channels of 50G PAM4 electrical signal as output.

     

    The QSFP-DD 400G modules are compliant with IEEE 802.3bs for 400GBASE-FR4 specification and 100G Lambda MSA, and 400GAUI-8/CEI-56G-VSR-PAM4 standards. This 400G QSFP-DD FR4 module has wide adoption in data center interconnect (DCI), 400G Ethernet, Infiniband interconnects, enterprise networking, etc.

     

    Part Number QT-QSFP-DD-FR4 Vendor Name QSFPTEK
    Form Factor QSFP-DD Interface Type FR4
    Max Data Rate 425Gbps (4x106.25Gb/s) Wavelength 1270nm,1290nm,1310nm,1330nm
    Connector Duplex LC/UPC Cable Type SMF
    Max Cable Distance 2km Modulation PAM4
    TX Power -3.2~3.5dBm Receiver Sensitivity <-7.3dBm
    Transmitter Type CWDM EML Receiver Type PIN
    Power Consumption ≤12W Temperature Range 0 to 70°C (32 to 158°F)
    DDM/DOM Supported Forward Error Correction (FEC) Host FEC Supported
    Protocols QSFP-DD MSA, IEEE 802.3bs, 400GBASE-FR4 spec, 100G Lambda MSA, 400GAUI-8/CEI-56G-VSR-PAM4 Warranty 1 Year
    Quality Testing Program
    Optical Transceivers Testing

    Take a look at our test program to get the reliable and high-performance optical transceivers.

    Quality Certifications

    Features

    • 1. Advanced Technology
      Features with PAM4 modulation technology, DSP chip and COB packaging technology.
    • 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
      Compliant with QSFP-DD MSA, IEEE 802.3bs, 400GBASE-FR4 spec, 100G Lambda MSA, 400GAUI-8/CEI-56G-VSR-PAM4 standards.
    • 4. Quality Certifications
      Backed by CE, FCC, ROSH, ISO9001.

    Applications

    Scenario 1: 400G to 400G Direct Connectivity

    QT-QSFP-DD-FR4 Scenario 1 400G to 400G Direct Connectivity

     

     

    Scenario 2: 800G 2FR4 OSFP to 2x 400G-FR4 QSFP-DD Breakout Connectivity

    QT-QSFP-DD-FR4 Scenario 2 800G 2FR4 OSFP to 2x 400G-FR4 QSFP-DD Breakout Connectivity

      

     

    Scenario 3: 800G 2FR4 QSFP-DD to 2x 400G-FR4 QSFP-DD Breakout Connectivity

    QT-QSFP-DD-FR4 Scenario 3 800G 2FR4 QSFP-DD to 2x 400G-FR4 QSFP-DD Breakout Connectivity

      

    Product details

    Various Switch Tests

     

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

     

     

     

    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.

     

    QDD-400G-FR4-S compatibility test

     

     

    Comprehensive Testing

     

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

     

     

     

    Short to Medium Reach 400G QSFP-DD Optics Contrast Table

     

    Part Number

    QT-QSFP-DD-SR4

    QT-QSFP-DD-SR8

    QT-QSFP-DD-DR4

    QT-QSFP-DD-DR4+

    QT-QSFP-DD-FR4

    Image

    Center Wavelength

    850nm

    850nm

    1310nm

    1310nm

    1310nm

    Connector

    MTP/MPO-12

    MTP/MPO-16

    MTP/MPO-12

    MTP/MPO-12

    Duplex LC

    Cable Distance (Max.)

    100m

    100m

    500m

    2km

    2km

    Modulation

    PAM4

    PAM4

    PAM4

    PAM4

    PAM4

    Transmitter + Receiver Type

    VCSEL 850nm + PIN

    VCSEL 850nm + PIN

    EML + PIN

    EML + PIN

    CWDM EML + PIN

    TX Power

    -4.6~4.0dBm

    -6.5~4.0dBm

    -2.9~4.0dBm

    -3.1~4.0dBm

    -3.2~3.5dBm

    Receiver Sensitivity

    <-6.3dBm

    <-8.4dBm

    <-5.9dBm

    <-7.1dBm

    <-7.3dBm

    Power Consumption

    ≤8W

    ≤12W

    ≤12W

    ≤12W

    ≤12W

    Temperature

    0 to 70°C (32 to 158°F)

    0 to 70°C (32 to 158°F)

    0 to 70°C (32 to 158°F)

    0 to 70°C (32 to 158°F)

    0 to 70°C (32 to 158°F)

    Application

    Data Center

    Data Center

    400G to 2x200G Breakout

    400G to 8x50G Breakout

    Data Center

    400G to 4x100G Breakout

    800G to 2x400G Breakout

    Data Center

    400G to 4x100G Breakout

    800G to 2x400G Breakout

    Data Center

    800G to 2x400G Breakout

      

    Questions & Answers

    • ALL (11)
    • 400G QSFP-DD (2)
    • QT-OSFP-400G-SR8 (1)
    • QT-QSFP-DD-SR8 (4)
    • QT-QSFP-DD-FR4 (1)
    • QT-QSFP-DD-DR4 (3)

    Customer Reviews

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    • ALL (6)
    • Customer Support (1)
    • Excellent Quality (1)
    • Good Price (2)
    • Shopping Experience (1)
    • Stable (1)
    • Compatibility (2)
    • Amanda Luke United States of America
      2026-08-13

      The FR4 option gave us a useful middle ground for this deployment. We had enough transmission distance for the planned links without having to over-spec the optics, which made the final design more practical.

      Transceivers typeQDD-400G-FR4-S | 2km | Duplex LC/UPC

      CompatibleCisco

      Verified Purchase

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    • Bryasia United States of America
      2026-08-12

      From an engineering perspective, this 400G FR4 module was easy to integrate into our existing environment.

      Transceivers typeQDD-400G-FR4-S | 2km | Duplex LC/UPC

      CompatibleCisco

      Verified Purchase

      Helpful

      0

    • Baron Ramsden Angola
      2026-08-05

      We chose this FR4 module for a data center interconnect project where balanced performance and simplicity were both important. The design matched our network requirements well and helped us keep the deployment straightforward without adding unnecessary complexity.

      Transceivers typeQDD-400G-FR4-S | 2km | Duplex LC/UPC

      CompatibleCisco

      Verified Purchase

      Helpful

      0

    • Dim James Spain
      2026-06-23

      These modules offer a great balance between performance and cost. They provide the high bandwidth required for modern data center applications while maintaining reliable optical performance and easy integration into existing fiber networks.

      Transceivers typeQDD-400G-FR4-S | 2km | Duplex LC/UPC

      CompatibleCisco

      Verified Purchase

      Helpful

      0

    • Eileen United States of America
      2025-06-20

      I was impressed with the customer support, they did answer each qustion patiently and professionally.

      Transceivers typeQDD-400G-FR4-S | 2km

      CompatibleCisco

      Verified Purchase

      Helpful

      0

    • Alice Hudson United States of America
      2025-05-28

      The 400G FR4 can run normally when plugged into NCS1K4-2-QDD-C-K9, no compatibility problem. The transmission is stable without any lag. It is very safe to use and the price is affordable. I will continue to repurchase.

      Transceivers typeQDD-400G-FR4-S | 2km

      CompatibleCisco

      Verified Purchase

      Helpful

      0

    Video

    Resources

    • PDF Document
      QT-QSFP-DD-FR4 QDD-400G-FR4 Datasheet.pdf
    • PDF Document
      Transceiver Module User Guide.pdf
    Check Test Reports on Target Device
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    Cisco QDD-400G-FR4-S Compatible 400GBASE-FR4 QSFP-DD PAM4 DDM 2km 1310nm Duplex LC/UPC SMF Optical Transceiver Module

    Compatible Cisco

    Transceivers type QDD-400G-FR4-S | 2km | Duplex LC/UPC

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    Mark

    2023-12-15
    This product works well with my switch, and I plan to buy some DWDM transceivers from QT. Excellent value fo ct works well with my switch, and I plan to buy some DWDM transceivers from QT. Excellent valur money!

    Verified Purchase

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    8

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    Cisco QDD-400G-FR4-S Compatible 400GBASE-FR4 QSFP-DD PAM4 DDM 2km 1310nm Duplex LC/UPC SMF Optical Transceiver Module
    US$ 560.90
    Compatible
    Cisco
    Transceivers type
    QDD-400G-FR4-S | 2km | Duplex LC/UPC
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    Bulk Order Quotes
    Cisco QDD-400G-FR4-S Compatible 400GBASE-FR4 QSFP-DD PAM4 DDM 2km 1310nm Duplex LC/UPC SMF Optical Transceiver Module

    Compatible Cisco

    Transceivers type QDD-400G-FR4-S | 2km | Duplex LC/UPC

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