400G QSFP-DD SR4 Optical Transceiver Module Compatible Juniper QDD-400G-SR4  | 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: Native recognition in Junos OS and Junos OS Evolved, ensuring full DDM/DOM telemetry and zero "unsupported transceiver" alarms.

• 100G to 400G MPO-12 Migration: The most efficient path to upgrade Juniper QFX data center fabrics while reusing existing MPO-12 OM4 fiber trunks.

• High-Density AI Cluster Interconnects: Providing ultra-fast 400G throughput for GPU-to-Switch links within short-reach AI training pods.

• Intra-Rack & Rack-to-Rack Connectivity: Optimized 400G connectivity for short-distance (under 100m) links in high-radix Juniper environments.

• Cloud Data Center Spine-Leaf Links: Reliable 400G aggregation for massive East-West traffic flows in modern leaf-spine architectures.

Connectivity Solutions(Applications) of 400G QSFP-DD Transceiver

FAQ for 400G QSFP-DD Optical Transceiver Modules

Q1:What is QDD-400G-SR4? A:The 400G QSFP-DD SR4 is a hot pluggable optical transceiver module with a speed of 400Gbps, a wavelength of  850nm, and a transmission distance of up to 100m with MPO-12,OM4 MMF. It is ideal for data centre, 400G Ethernet and Infiniband Interconnects.

Q2:What is the maximum transmission distance of the 400G QSFP-DD SR4 transceiver?A:HYTOPTODEVICE QSFP-DD 400G SR4 module supports the maxium transmitting distance of up to 100m with MPO-12, OM4 MMF

Q3:What fiber connector is required for the HYTOPTODEVICE QSFP-DD-400G-SR4?A:The 400G QSFP DD SR4 module uses an MPO-12 connector with MMF.

Q4:Does the HYTOPTODEVICE QDD-400G-SR4-S require FEC?A:Yes. According to the IEEE 802.3db standard, Host KP4 FEC must be enabled on the Cisco switch port to achieve the 100m distance with a reliable Bit Error Rate (BER).

Q5:Does the HYTOPTODEVICE QSFP-DD-400G-SR4 support breakout to 100G?A:Yes, The 400G SR4 module operates by using 4 independent channels, each channel running at 100G PAM4. so the HYTOPTODEVICE QSFP-DD-400G-SR4 transceiver fully supports breakout applications to 4x 100G.

Q6:Where to buy 400G QSFP DD SR4 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:Q: Why choose the HYTOPTODEVICE QSFP-DD-400G-SR4 over the SR8 version? A: The QSFP-DD-400G-SR4 version is designed for improved efficiency. It uses an MPO-12 connector (100G standard), while the QSFP-DD-400G-SR8 requires an MPO-16 connector. If you already have MPO-12 cabling installed, the HYTOPTODEVICE 400G SR4 is a more economical option.This will allow you to upgrade from 100G to 400G using the existing MPO-12 fiber.

Q8:Is the 400G QSFP-DD SR4 backward compatible with lower-speed modules,such as 100G?A: Yes. QSFP-DD 400G SR4 uses parallel fiber (MPO-12). Using an MPO-to-4xLC breakout cable, you can link it to four 100G-SR (PAM4) transceivers.

 Q9:How do HYTOPTODEVICE ensure 400G QSFP-DD SR4 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-SR4 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:who makes the best 400g transceiver?A: 400G Optical Transceiver Manufacturer China HYTOPTODEVICE ensures that the QDD-400G-SR4 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.Power efficiency, thermal management, multi-vendor compatibility,fast delivery are HYTOPTODEVICE advantage and commitment.

Q12：Does it use MPO-12 or MPO-16？A:The 400G QSFP-DD SR4 uses MPO-12 connector. There are 4 transmit and 4 receive channels (8 fibers total). An MPO-12 connector is used, with the 4 middle fibers typically remaining unused.

Q13:Who is the best optical transceiver manufacturer in china? A:HYTOPTODEVICE is the best optical transceiver manufacturer in china with high-performance,100% compatibility, fast and stable delivery,sour factory price.

Q14:Q:Can a 400G SR8 module to a 400G SR4 module be connected?A:No. they can not interconnect.SR8 use the MPO-16 connector, SR4 for MPO-12. the connector mismatch. their wavelength and lane speed mismatch.

Q15: What difference is SR4 vs SR8 for 400G QSFP-DD modules?

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, 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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