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    Home / Products / Transceivers / 400G/800G/1.6T Ethernet Transceivers / 800G QSFP-DD / 203135

    Juniper QDD-2X400G-FR4-P (740-170960) Compatible 800GBASE-2FR4 Twin-port QSFP-DD PAM4 1270 to 1330nm 2km DDM Dual Duplex LC/UPC SMF Optical Transceiver Module

    Product No: 203135
    48 Reviews
    200 Sold
    US$ 1,327.90
    Compatible
    Transceivers type
    18 in real-time stock, 16 Jul, 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.
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    1. 8 optical channels, dual duplex LC 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 ≤17W
    See more

    Specifications

    Juniper QDD-2X400G-FR4-P (740-170960) Compatible 2x 400GBASE FR4 QSFP-DD PAM4 Optical Transceiver Module (1271nm, 1291nm, 1311nm, 1331nm, 2km, Dual Duplex LC, SMF, 0℃ to +70℃, DDM)

     

    Juniper QDD-2X400G-FR4-P (740-170960) 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 LC 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-LC 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 LC Duplex Cable Type SMF
    Transmitter Type EML Receiver Type PIN
    TX Power -3.2 to +4.4dBm Receiver Sensitivity -7.2dBm
    Power Consumption ≤17W Modulation Format PAM4
    DDM/DOM Supported 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 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

    Applications

    Scenario 1: 800G to 800G Direct Connectivity

     

    QT-QSFP-DD-800G-2FR4 Scenario 1 800G to 800G Direct Connectivity 

      

    Scenario 2: 800G to 2x 400GE Connectivity

      

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

     

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

     QSFP-DD 2FR4 BREAKOUT

          

     

    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.

     

    QSFPTEK Test Rack

     

     

    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 QSFP-DD Optical Transceivers Contrast Table

     

    Part Number

    QT-QSFP-DD-800G-SR8

    QT-QSFP-DD-800G-2VR4

    QT-QSFP-DD-800G-DR8

    QT-QSFP-DD-800G-2DR4

    Image

    Data Rate

    800G

    800G

    800G

    800G

    Optical Connector

    Single MPO-16/APC

    Dual MPO-12/APC

    Single MPO-16/APC

    Dual MPO-12/APC

    Cable Type

    MMF

    MMF

    SMF

    SMF

    Wavelength

    850nm

    850nm

    1310nm

    1310nm

    Reach

    50m

    50m

    500m

    500m

    Modulation

    PAM4

    PAM4

    PAM4

    PAM4

    Max Power Consumption

    < 16W

    < 16W

    < 16.5W

    < 18W

    Application

    800G to 800G, 800G to 2x400G breakout

    800G to 800G, 800G to 2x400G breakout

    800G to 800G, 800G to 2x400G breakout, 800G to 8x100G breakout

    800G to 800G, 800G to 2x400G breakout

    Matching Downlink  Transceivers

    QT-QSFP-DD-SR4 (400G)

    QT-Q112-400G-SR4

    QT-OSFP-400G-SR4

    QT-QSFP-DD-SR4 (400G)

    QT-Q112-400G-SR4

    QT-OSFP-400G-SR4

    QT-QSFP-DD-DR4 (400G)

    QT-Q112-400G-DR4

    QT-OSFP-400G-DR4

    QT-QSFP28-DR1

    QT-QSFP-DD-DR4 (400G)

    QT-Q112-400G-DR4

    QT-OSFP-400G-DR4

    Part Number

    QT-QSFP-DD-800G-2XDR4

    QT-QSFP-DD-800G-2FR4

    QT-QSFP-DD-800G-2LR4

    		  

    Image

    		 

    Data Rate

    800G

    800G

    800G

    		  

    Optical Connector

    Dual MPO-12/APC

    Dual Duplex CS/UPC

    Dual Duplex LC/UPC

    		  

    Cable Type

    SMF

    SMF

    SMF

    		  

    Wavelength

    1310nm

    1271nm, 1291nm, 1311nm and 1331nm

    1271nm, 1291nm, 1311nm and 1331nm

    		  

    Reach

    2km

    2km

    10km

    		  

    Modulation

    PAM4

    PAM4

    PAM4

    		  

    Max Power Consumption

    < 18W

    < 18W

    ≤ 18W

    		  

    Matching Transceivers

    QT-QSFP-DD-DR4+ (400G)

    QT-Q112-400G-DR4+

    QT-QSFP28-FR1

    QT-QSFP-DD-FR4 (400G)

    QT-Q112-400G-FR4

    QT-OSFP-400G-FR4

    QT-QSFP-DD-LR4 (400G)
    QT-OSFP-400G-LR4

    		  

    Application

    800G to 800G, 800G to 2x400G breakout, 800G to 8x100G breakout

    800G to 800G, 800G to 2x400G breakout

    800G to 800G, 800G to 2x400G breakout

    		  

    Questions & Answers

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    Customer Reviews

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    • ALL (14)
    • Premium Service (3)
    • Cabling (1)
    • Shopping Experience (1)
    • High Reliability (1)
    • High Performance (2)
    • Customer Support (1)
    • Flexible (1)
    • Cable Management (1)
    • Good Price (1)
    • Good Packaging (1)
    • Fast Delivery (4)
    • Compatibility (1)
    • Eudora Isaac United States of America
      2026-07-10

      This module was installed during our final project acceptance testing. Every required check was completed successfully on the first attempt, which helped us finish the handover on schedule. It's always reassuring when hardware performs exactly as expected.

      Transceivers typeQDD-2X400G-FR4-P | 2km | Dual Duplex LC/UPC

      CompatibleJuniper

      Verified Purchase

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    • Xanthe Lincoln United States of America
      2026-07-09

      We purchased this module as part of a repeat order, and the experience was just as good as the first time. The product was exactly as described, arrived on schedule, and the consistency between batches makes it a supplier we can rely on for future projects.

      Transceivers typeQDD-2X400G-FR4-P | 2km | Dual Duplex LC/UPC

      CompatibleJuniper

      Verified Purchase

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      0

    • Ruth Tony United States of America
      2026-07-08

      The order was dispatched quickly and reached us within the expected delivery window. Since this was for a scheduled installation, receiving the modules on time helped keep the project moving without any delays.

      Transceivers typeQDD-2X400G-FR4-P | 2km | Dual Duplex LC/UPC

      CompatibleJuniper

      Verified Purchase

      Helpful

      0

    • Barton Valentine United States of America
      2026-07-07

      Before placing the order, Talia patiently answered several questions about the module and recommended the most suitable option for our application. Communication was prompt, professional, and never felt rushed. It's always nice to work with someone who understands the products well.

      Transceivers typeQDD-2X400G-FR4-P | 2km | Dual Duplex LC/UPC

      CompatibleJuniper

      Verified Purchase

      Helpful

      0

    • Seamas United States of America
      2026-07-03

      The LC duplex interface simplified our patching layer compared to MPO-based optics. It noticeably reduced cable management overhead.

      Transceivers typeQDD-2X400G-FR4-P | 2km | Dual Duplex LC/UPC

      CompatibleJuniper

      Verified Purchase

      Helpful

      0

    • Steward Eisenhower United States of America
      2026-07-01

      The product page was easy to navigate and included the information I needed, such as specifications, compatibility, and fiber requirements. It made comparing different 800G modules much easier, and I was able to place the order without having to contact support first.

      Transceivers typeQDD-2X400G-FR4-P | 2km | Dual Duplex LC/UPC

      CompatibleJuniper

      Verified Purchase

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      0

    • Paddy Fanny United States of America
      2026-06-30

      After receiving the module, I contacted the support team to confirm a few deployment details. They responded promptly and provided the information I needed without unnecessary back-and-forth.

      Transceivers typeQDD-2X400G-FR4-P | 2km | Dual Duplex LC/UPC

      CompatibleJuniper

      Verified Purchase

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      0

    • Marcia Conan United States of America
      2026-06-25

      We used this module during a scheduled data center expansion project. The LC connectivity fit perfectly with the existing fiber infrastructure, which reduced installation time considerably. The deployment team had no issues bringing the links online.

      Transceivers typeQDD-2X400G-FR4-P | 2km | Dual Duplex LC/UPC

      CompatibleJuniper

      Verified Purchase

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      0

    • Noel United States of America
      2026-06-16

      The lead time was much better than other vendors we contacted. Everything arrived on schedule, which helped us avoid delays on a tight project.

      Transceivers typeQDD-2X400G-FR4-P | 2km | Dual Duplex LC/UPC

      CompatibleJuniper

      Verified Purchase

      Helpful

      0

    • Riko Japan
      2026-06-03

      買いやすかったし、値段も手頃だよ。Juniperのスイッチでバッチリ動いてる。また買うね。

      Transceivers typeQDD-2X400G-FR4-P | 2km | Dual Duplex LC/UPC

      CompatibleJuniper

      Verified Purchase

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      0

    Video

    Resources

    • PDF Document
      QT-QSFP-DD-800G-2FR4 LC Datasheet.pdf
    • PDF Document
      Transceiver Module User Guide.pdf
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    Juniper QDD-2X400G-FR4-P (740-170960) Compatible 800GBASE-2FR4 Twin-port QSFP-DD PAM4 1270 to 1330nm 2km DDM Dual Duplex LC/UPC SMF Optical Transceiver Module

    Compatible Juniper

    Transceivers type QDD-2X400G-FR4-P | 2km | Dual 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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    Juniper QDD-2X400G-FR4-P (740-170960) Compatible 800GBASE-2FR4 Twin-port QSFP-DD PAM4 1270 to 1330nm 2km DDM Dual Duplex LC/UPC SMF Optical Transceiver Module
    US$ 1,327.90
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    QDD-2X400G-FR4-P | 2km | Dual Duplex LC/UPC
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    Juniper QDD-2X400G-FR4-P (740-170960) Compatible 800GBASE-2FR4 Twin-port QSFP-DD PAM4 1270 to 1330nm 2km DDM Dual Duplex LC/UPC SMF Optical Transceiver Module

    Compatible Juniper

    Transceivers type QDD-2X400G-FR4-P | 2km | Dual Duplex LC/UPC

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