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QDD optical module

Fiber and communications infrastructure knowledge brief Published 13 Jun 2026

Prepared for preliminary research by the ENSAA knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

QDD (QSFP-DD) optical modules are high-speed 400G transceivers designed for data center, cloud, and high-performance network applications, supporting various distances, connector types, and breakout configurations. OverviewQDD (Quad Small Form-Factor Pluggable Double Density) modules are 400G optical transceivers that enable high-bandwidth Ethernet connectivity. They are designed to support 400 Gigabit Ethernet over single-mode or multimode fiber and are compliant with QSFP-DD MSA, 100G Lambda MSA, and IEEE 802.

3bs standards. These modules are hot-pluggable and provide high-density solutions for data centers, enterprise networks, and service provider applications. Key VariantsDR4 / 400GBASE-DR4+: Supports up to 2 km over single-mode fiber (SMF) using four parallel 100G PAM4 lanes with MTP/MPO-12 connectors.

It allows 4x100G breakout to QSFP28 100G-FR. FR4 / 400GBASE-FR4: Supports up to 2 km SMF with duplex LC connectors, suitable for medium-range data center interconnects. SR8 / 400GBASE-SR8: Designed for short-range multimode fiber (OM3/OM4), supporting link lengths up to 70–100 meters with MTP/MPO connectors.

Z

R / ZR+ Coherent Modules: High-performance coherent transceivers for long-haul and metro networks, supporting distances up to 120 km with amplification and DWDM applications. They use C-band tunable coherent optics and advanced modulation formats like DP-QPSK, DP-16QAM. Connectors and BreakoutMTP/MPO-12: Common for DR4 and SR8 modules, supporting parallel lanes and breakout configurations.

L

C Duplex: Used in FR4 modules for medium-range SMF links.

Copper Direct-

Attach (CUxM): Short-range QSFP-DD to QSFP-DD or QSFP-DD to 4x100G copper connections for intra-rack or adjacent rack links.

Applications

Data Centers: High-density 400G interconnects between switches and servers. Cloud Networks: Scalable, high-bandwidth links for cloud infrastructure. Enterprise Core and Distribution: High-speed backbone connectivity.

Metro and Long-

Haul Networks: Coherent ZR/ZR+ modules for regional and long-distance optical transport.

Performance Features

High Bandwidth Density: Supports 400G Ethernet in a compact QSFP-DD form factor. Breakout Capability: Enables splitting a 400G port into multiple 100G or 200G links. Protocol Compliance: IEEE 802.

3bs, 400GAUI-8/CEI-56G-VSR-PAM4, and CMIS 4. 0. Digital Diagnostics: I2C interface for monitoring optical power, temperature, and other parameters.

SummaryQDD optical modules provide flexible, high-performance solutions for modern high-speed networks. Depending on the variant, they can support short-range multimode, medium-range single-mode, or long-haul coherent links, with options for breakout, high-density deployment, and advanced modulation formats. They are essential components for 400G Ethernet connectivity in data centers, cloud networks, and service provider infrastructures.

QDD optical module - ENSAA OPTICAL NETWORKS [PDF]

QDD optical module

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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