Juniper QDD-400G-FR4 Compatible 400G QSFP-DD FR4 Optical Transceiver Module | HYTOPTODEVICE

• PTX Series Routers: PTX10001-36MR, PTX10003, PTX10004, PTX10008, PTX10016.

• QFX Series Switches: QFX5220-32CD, QFX5230-64CD, QFX5240-64QD, QFX5130-32CD.

• MX Series Universal Routing Platforms: MX10004, MX10008, and MX series 400G line cards (e.g., MX10K-LC9600).

• Operating Systems: Full support for Junos OS and Junos OS Evolved (introduced in 19.4R1 for PTX), ensuring native DDM/DOM diagnostics without compatibility alarms.

• Leaf-to-Spine Interconnects: The primary 2 km SMF solution for massive data center fabrics where multi-mode fiber (SR8) reach is insufficient.

• Data Center Interconnect (DCI): Linking buildings or server halls within a campus environment across a 2 km single-mode path.

• AI Cluster backbones: High-throughput, low-latency backbone for AI training and GPU-intensive workloads.

• Metro Aggregation: Ideal for aggregating high-bandwidth traffic from 100G edge nodes into 400G core transport systems.

  Connectivity Solutions(Applications) for 400G Optical Transceiver：

FAQ for 400G QSFP-DD Optical Transceiver Modules

Q1:What is QDD-400G-FR4? A:The 400G QSFP-DD FR4 is a hot pluggable optical transceiver module with a speed of 400Gbps, a wavelength of  1310nm, and a transmission distance of up to 2km with Duplex LC connector,OS2 SMF. It is ideal for data centre, 400G Ethernet and Infiniband Interconnects.

Q2:What is the maximum transmission distance of the 400G QSFP-DD FR4 transceiver?A:HYTOPTODEVICE QSFP-DD 400G FR4 module supports the maxium transmitting distance of up to 2km with Duplex LC SMF.

Q3:What fiber connector is required for the HYTOPTODEVICE  QSFP-DD-400G-FR4?A:The 400G QSFP DD FR4 module uses an Duplex LC connector with SMF.

Q4:How does this QDD-400G-FR4 differ from the QDD-400G-DR4-S?A:Although they use 1310nm wavelength with SMF. there are distinct difference.FR4 utilizes CWDM technology (1271, 1291, 1311, 1331nm) to multiplex four 100G signals of different frequencies into a single pair (2 cores) of optical fiber. It features Dupliex LC interface with transmission distance of up to 2 km, and point-to-point connections. DR4 employs four parallel 1310nm wavelength technologies (8 cores), an MPO-12 interface, and a transmission distance limited to 500 meters. It is typically used in 4x100G breakout applications.

Q5:Does the HYTOPTODEVICE QSFP-DD-400G-FR4 support breakout to 100G?A:No. QSFP-DD-400G-FR4 typically does not support a breakout to 4 x 100G.Because 400G QSFP DD FR4 is linked with point to point way.If you want to use the breakout to 100G, QSFP-DD-400G-DR4 is perfect choice.

Q6:Where to buy 400G QSFP DD FR4 optical transceiver?A:There are many factories that produce and sell 400G  fiber optical modules, but 400G optical transceiver manufacturer china HYTOPTODEVICE is the excellent provider: a source factory, fully controllable process, reliable performance, 100% compatible, sufficient inventory, fast delivery, and quick response.

Q7:The link is "Up" but I have high packet loss. Why? A:There could be two reasons,1. Dirty connectors:tiny dust particles can obstruct signal transmission. Please use  fiber optic cleaner to clean the connector. 2. Fiber optic cable bending: avoid  severe bending of the fiber optic cable.

Q8:Is the 400G QSFP-DD FR4 backward compatible with lower-speed modules,such as 100G?A:NO.A 400G QSFP-DD FR4 module cannot communicate directly with a standard 100G QSFP28 module such as 100G CWDM4 or 100G LR4.The 400G QSFP DD FR4 Uses PAM4 modulation (50G or 100G per wavelength),100G transceiver use NRZ modulation (25G per lane).They cannot sync. you can use 400G QSFP-DD DR4 to communicate with 100G transceivers by breakout solution.

 Q9:How do HYTOPTODEVICE ensure 400G QSFP-DD FR4 module compatibility with network switch?A:Ensuring 100% compatibility, optical transceiver modules must be coded to match the switch's requirements. 400G Optical Transceiver Manufacturer China HYTOPTODEVICE was equipped with various high-speed switch,the brands include such as Cisco,NVIDIA,Arista,Juniper. highly professional in coding equipment for various brands to ensure they are recognized and running in your  device.
 
Q10:Is QDD-400G-FR4 hot-swappable?A:HYTOPTODEVICE fiber transceiver modules are hot-pluggable, hot Pluggable QSFP-DD MSA Compliant.you can plug or unplug the optical transceiver, while the device is powered on without damaging the hardware.

Q11:Why Choose HYTOPTODEVICE for  QSFP-DD-400G-FR4?A: High-Speed Optical Transceiver Manufacturer China HYTOPTODEVICE ensures that the QDD-400G-FR4 is coded and tested for full compatibility with major switch vendors (such as Cisco, Juniper, Arista, and huawei). They verify the EEPROM settings to ensure "plug-and-play" functionality without port-recognition errors.

Q12：Does it use MPO-12 or MPO-16？A:No.The 400G QSFP-DD FR4  does not support MPO-12/MPO-16 connectors. The reason is that the QDD-400G-FR4 use the CWDM technology to transmit with Dupliex LC connector over SMF. Its connection is point to point. MPO-12/MPO-16 connector is not suitable.

Why Network Engineers Choose HYTOPTODEVICE

HYTOPTODEVICE has supplied over 5000,000 optical transceiver modules to data centers, ISPs, and enterprise networks across 100+ countries since 2011. Every module undergoes a 72-hour burn-in test and full DDM/DOM validation before shipment.

• 100% MSA-compliant modules with Cisco, Huawei,Dell,Juniper, and Arista compatibility
• ISO 9001:2015 certified manufacturing facility in Shenzhen
• Average lead time of 3–5 business days with DHL/FedEx express options
• Dedicated pre-sales engineering support for custom configurations
• Actual hardware,actual switches,actual results.we publish compatibility test video,eliminate compatibility anxiety. you can watch before you buy. 
• We can provide inspection and shipping videos to make you feel as if you are right here with the product.

"We replaced 200 Cisco-branded SFPs with HYTOPTODEVICE equivalents across our spine layer — zero compatibility issues, 40% cost reduction."— Network Architect, Tier-2 ISP, Germany

Quality Certification & Compliance：

 At HYTOPTODEVICE, our quality commitment is backed by industry-standard validations. From fiber optical transceiver manufacturing to final inspection, our processes ensure global compliance and reliability.

We adhere to rigorous standards for our SFP modules and network solutions:

• ISO 9001: Certified quality management and production consistency.

• CE & FCC: Fully compliant for seamless Global Market Access.

• RoHS: Committed to environmental responsibility and hazardous material control.

• Proven Reliability: Rigorous testing to reduce compliance risk and ensure safety.

Certified Quality. Global Standards. Guaranteed Performance.

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