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400G QSFP-DD

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400G QSFP-DD Overview

The 400G QSFP-DD category contains four PAM4 optical transceiver modules for high-density 400G Ethernet connectivity in data centers, high-performance computing networks, enterprise core and aggregation layers, and service provider infrastructure. All models use the QSFP-DD form factor and support DOM monitoring. The series includes two multimode and two single-mode transceivers, covering transmission distances from 100m to 2km. Depending on the optical standard, the modules use an MTP/MPO-16 APC connector, an MTP/MPO-12 APC connector, or a duplex LC/UPC connector.

QDD-400G-SR8 This 400GBASE-SR8 QSFP-DD transceiver operates at 850nm over multimode fiber and supports transmission up to 100m. Its SR8 parallel optical interface uses an MTP/MPO-16 APC connector for eight optical channels. The module combines PAM4 modulation with DOM monitoring and provides short-reach 400G Ethernet connectivity for data centers, HPC networks, enterprise core and aggregation layers, and service provider infrastructure.

QDD-400G-SR4 This 400GBASE-SR4 QSFP-DD transceiver provides 850nm transmission over multimode fiber through an MTP/MPO-12 APC connector. Its SR4 architecture carries the 400G link across four parallel optical channels and supports distances up to 100m. The module incorporates PAM4 modulation and DOM monitoring for short-reach connections in data centers, high-performance computing networks, enterprise core and aggregation environments, and service provider infrastructure.

QDD-400G-DR4 This 400GBASE-DR4 QSFP-DD transceiver operates at 1310nm over single-mode fiber and uses an MTP/MPO-12 APC connector. Its DR4 interface transmits the 400G signal across four parallel optical channels and reaches distances up to 500m. PAM4 modulation and DOM monitoring are integrated into the module for 400G Ethernet interconnections across data centers, HPC networks, enterprise core and aggregation layers, and service provider infrastructure.

QDD-400G-FR4 This 400GBASE-FR4 QSFP-DD transceiver supports 1310nm transmission over single-mode fiber through a duplex LC/UPC connector. The FR4 optical interface carries the 400G connection over a duplex fiber pair and supports transmission distances up to 2km. The module uses PAM4 modulation and DOM monitoring for longer-reach links in data centers, high-performance computing networks, enterprise core and aggregation layers, and service provider infrastructure.

FAQ

What is the practical cabling difference between QDD-400G-SR8 and QDD-400G-SR4 for 100m multimode 400G Ethernet links?

QDD-400G-SR8 uses an MTP/MPO-16 APC connector with eight parallel optical channels, while QDD-400G-SR4 uses an MTP/MPO-12 APC connector with four parallel optical channels. Both operate at 850nm over multimode fiber and support distances up to 100m.

Can QDD-400G-SR8 be connected through the same MTP/MPO-12 APC cabling used by QDD-400G-SR4?

No. QDD-400G-SR8 requires an MTP/MPO-16 APC interface for its eight-channel parallel optical connection, whereas QDD-400G-SR4 uses an MTP/MPO-12 APC interface for four optical channels. The connector and fiber-count requirements must match the selected module.

Why does QDD-400G-DR4 use an MTP/MPO-12 APC connector while QDD-400G-FR4 uses duplex LC/UPC?

QDD-400G-DR4 carries 400G over four parallel single-mode optical channels, requiring an MTP/MPO-12 APC connection. QDD-400G-FR4 multiplexes four optical wavelengths onto one duplex single-mode fiber pair, allowing it to use a duplex LC/UPC connector.

Which model in the 400G QSFP-DD category supports the longest single-mode transmission distance?

Up to 2km. QDD-400G-FR4 provides the longest reach in this category using 1310nm transmission over single-mode fiber with a duplex LC/UPC connector. QDD-400G-DR4 also uses 1310nm single-mode transmission but supports distances up to 500m.

Which 400G QSFP-DD models use parallel optical connections, and which model operates over a duplex fiber pair?

QDD-400G-SR8, QDD-400G-SR4, and QDD-400G-DR4 use parallel optical connections through MTP/MPO connectors. QDD-400G-FR4 carries the 400G link over a duplex single-mode fiber pair through a duplex LC/UPC connector.

Do QDD-400G-SR8, QDD-400G-SR4, QDD-400G-DR4, and QDD-400G-FR4 all support DOM monitoring?

Yes. All four 400G QSFP-DD models include DOM monitoring, allowing supported host equipment to access the module’s operational diagnostic information. DOM support is available across both the multimode SR models and the single-mode DR4 and FR4 models.

Can QDD-400G-SR8 or QDD-400G-SR4 replace QDD-400G-DR4 or QDD-400G-FR4 on the same installed fiber link?

No. QDD-400G-SR8 and QDD-400G-SR4 require 850nm multimode fiber, while QDD-400G-DR4 and QDD-400G-FR4 require 1310nm single-mode fiber. Their connector configurations and supported distances also differ, so the installed fiber infrastructure must match the specific model.

Do QDD-400G-SR4 and QDD-400G-DR4 use the same connector despite requiring different fiber types?

Yes. Both models use an MTP/MPO-12 APC connector, but their optical links are not interchangeable. QDD-400G-SR4 operates at 850nm over multimode fiber for up to 100m, while QDD-400G-DR4 operates at 1310nm over single-mode fiber for up to 500m.

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