{"id":466,"date":"2026-01-28T14:42:49","date_gmt":"2026-01-28T06:42:49","guid":{"rendered":"https:\/\/ascentoptics.com\/blog\/?p=466"},"modified":"2026-03-24T11:33:05","modified_gmt":"2026-03-24T03:33:05","slug":"comparison-of-qsfp-dd-with-other-types-of-optical-modules","status":"publish","type":"post","link":"https:\/\/ascentoptics.com\/blog\/comparison-of-qsfp-dd-with-other-types-of-optical-modules\/","title":{"rendered":"Comparison of 400G QSFP-DD with other types of optical modules"},"content":{"rendered":"\r\n

Among the various 400G optical module form factors, QSFP-DD<\/a> (Quad Small Form-factor Pluggable Double Density) has emerged as a leading solution due to its high bandwidth capacity, backward compatibility, and ability to support high port density within existing infrastructure.<\/p>\r\n

This article provides a detailed comparison of QSFP-DD with other mainstream optical module types, helping you understand their key differences and make informed decisions when deploying high-speed networks.<\/p>\r\n

\u00a0<\/h2>\r\n

400G QSFP-DD\u00a0optical module detailed introduction<\/strong><\/span><\/h2>\r\n\r\n\r\n\r\n

The 400G\u00a0 QSFP-DD<\/a> (Quad Small Form Factor Pluggable-Double Density) Dual Density Quad Small Form Factor Pluggable is a package of high speed pluggable module defined by the QSFP-DD MSA group. It serves\u00a0as the preferred 400G optical module package, enabling data centers to efficiently grow and scale cloud capacity as needed.<\/p>\r\n

 <\/p>\r\n\r\n\r\n

\r\n
<\/figure><\/div>\r\n\r\n\r\n

Features<\/strong><\/h3>\r\n\r\n\r\n\r\n

It is\u00a0forward and backward compatible with QSFP, and compatible with existing QSFP28 optical modules,\u00a0AOC\/DAC, and other compatible devices.<\/p>\r\n\r\n\r\n\r\n

The QSFP-DD can achieve up to 14.4Tb\/s of aggregated bandwidth in a single switch slot. It\u00a0Features 8-channel electrical interfaces with rates of up to 25Gb\/s (NRZ modulation) or 50Gb\/s (PAM4<\/a> modulation) per channel, providing solutions for up to 200Gb\/s or 400Gb\/s aggregation.<\/p>\r\n

 <\/p>\r\n

 <\/p>\r\n\r\n\r\n

\r\n
\"QSFP-DD\u00a0Features\"<\/figure><\/div>\r\n\r\n\r\n

 <\/p>\r\n

By\u00a0Using SMT (Surface-Mount Technology) connectors and 1xN cages, along with cage design optimization and module housing optimization,\u00a0each module can achieve at least 12\u00a0watts\u00a0of thermal capacity.<\/p>\r\n\r\n\r\n\r\n

The\u00a0transmission media include passive copper cable (DAC), multi-mode fiber (MMF) and single-mode fiber (SMF).<\/p>\r\n

 <\/p>\r\n

Main Types of 400G QSFP-DD Modules<\/strong><\/h3>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
\r\n

Type<\/b><\/strong><\/p>\r\n<\/td>\r\n

\r\n

Form Factor<\/b><\/strong><\/p>\r\n<\/td>\r\n

\r\n

Transmission Distance<\/b><\/strong><\/p>\r\n<\/td>\r\n

\r\n

Connector<\/b><\/strong><\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

400G-SR8<\/a><\/p>\r\n<\/td>\r\n

\r\n

QSFP-DD<\/p>\r\n<\/td>\r\n

\r\n

100 m<\/p>\r\n<\/td>\r\n

\r\n

MPO-12\/16<\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

400G-DR4<\/p>\r\n<\/td>\r\n

\r\n

QSFP-DD<\/p>\r\n<\/td>\r\n

\r\n

500 m<\/p>\r\n<\/td>\r\n

\r\n

MPO-12<\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

400G-FR4<\/p>\r\n<\/td>\r\n

\r\n

QSFP-DD<\/p>\r\n<\/td>\r\n

\r\n

2 km<\/p>\r\n<\/td>\r\n

\r\n

LC Duplex<\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

400G-LR4<\/a><\/p>\r\n<\/td>\r\n

\r\n

QSFP-DD<\/p>\r\n<\/td>\r\n

\r\n

10 km<\/p>\r\n<\/td>\r\n

\r\n

LC Duplex<\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

400G-LR8<\/p>\r\n<\/td>\r\n

\r\n

QSFP-DD<\/p>\r\n<\/td>\r\n

\r\n

10 km<\/p>\r\n<\/td>\r\n

\r\n

\u00a0LC Duplex<\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

400G-ER4<\/p>\r\n<\/td>\r\n

\r\n

QSFP-DD<\/p>\r\n<\/td>\r\n

\r\n

40 km<\/p>\r\n<\/td>\r\n

\r\n

LC Duplex<\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

400G-ZR<\/p>\r\n<\/td>\r\n

\r\n

QSFP-DD<\/p>\r\n<\/td>\r\n

\r\n

80 km<\/p>\r\n<\/td>\r\n

\r\n

LC Duplex<\/p>\r\n<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n

 <\/p>\r\n

SR and DR modules are mainly used for short-reach interconnects within data centers, typically using MPO connectors.<\/p>\r\n

FR, LR, ER, and ZR modules are designed for medium- to long-distance transmission and usually adopt LC connectors.<\/p>\r\n

Each type differs in cost, power consumption, and deployment complexity, making proper selection critical for network design.<\/p>\r\n

 <\/p>\r\n\r\n\r\n\r\n

QSFP-DD vs. QSFP (QSFP+\/QSFP28)<\/strong><\/h2>\r\n

 <\/p>\r\n\r\n\r\n

\r\n
\"\"<\/figure><\/div>\r\n\r\n\r\n

Bandwidth<\/strong><\/p>\r\n\r\n\r\n\r\n

QSFP-DD offers up to ten times the bandwidth of QSFP+ or four times the bandwidth of QSFP28.<\/p>\r\n\r\n\r\n\r\n

QSFP has four electrical lanes at 10Gb\/s (QSFP+) or 25Gb\/s (QSFP28) per lane, aggregated to provide 40Gb\/s or 100Gb\/s solutions.<\/p>\r\n\r\n\r\n\r\n

The electrical interface of the QSFP-DD pluggable package features eight channels at rates up to 25Gb\/s (NRZ modulation) or 50Gb\/s (PAM4<\/a> modulation) per channel, aggregating to provide solutions of up to 200Gb\/s or 400Gb\/s.<\/p>\r\n\r\n\r\n\r\n

Compatibility<\/strong><\/p>\r\n\r\n\r\n\r\n

QSFP-DD is backward compatible with QSFP+\/QSFP28. Systems designed with QSFP-DD modules are backward compatible, supporting existing QSFP+\/QSFP28 modules and providing flexibility for end users and system designers.<\/p>\r\n\r\n\r\n\r\n

Port Density<\/strong><\/p>\r\n\r\n\r\n\r\n

The QSFP-DD and QSFP+\/QSFP28 systems have the same port density. However, because each QSFP-DD port can accommodate eight channels instead of four, QSFP-DD doubles the number of ASIC ports it supports for existing interfaces such as CAUI-4.<\/p>\r\n\r\n\r\n\r\n

The mechanical interface of the QSFP-DD on the motherboard is slightly deeper than the QSFP+\/QSFP28 to accommodate an additional\u00a0row of contacts.<\/p>\r\n\r\n\r\n\r\n

QSFP-DD increases the bandwidth to 10x\/4x of QSFP+\/QSFP28 with only a slight increase in length while maintaining the same port density, and is also backward compatible, which means customers can directly deploy its systems without using QSFP, thereby reducing a significant amount of equipment costs.<\/p>\r\n

 <\/p>\r\n\r\n\r\n\r\n

400G QSFP-DD vs. OSFP<\/strong><\/h2>\r\n\r\n\r\n\r\n

OSFP is a new pluggable package with 8 high-speed electrical channels that will initially support a transmission rate of 400Gb\/s (8x50G).<\/p>\r\n

QSFP-DD and OSFP are both optical transceiver form factors designed for 400G and 800G high-speed interconnects. QSFP-DD achieves higher bandwidth through a double-density electrical interface while maintaining backward compatibility with QSFP28 and QSFP56, making it well suited for data centers that require smooth upgrades and high port density.<\/p>\r\n

OSFP features a slightly larger form factor with superior thermal performance, making it more suitable for higher-power 800G optical modules; however, it does not offer backward compatibility and is typically deployed in newly built hyperscale or AI-focused data centers.<\/p>\r\n

 <\/p>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
\r\n

Feature<\/strong><\/p>\r\n<\/td>\r\n

\r\n

400G QSFP-DD<\/strong><\/p>\r\n<\/td>\r\n

\r\n

OSFP<\/strong><\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

Full Name<\/p>\r\n<\/td>\r\n

\r\n

Quad Small Form Factor Pluggable \u2013 Double Density<\/p>\r\n<\/td>\r\n

\r\n

Octal Small Form Factor Pluggable<\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

Target Data Rates<\/p>\r\n<\/td>\r\n

\r\n

400G<\/p>\r\n<\/td>\r\n

\r\n

800G (designed for higher-power optics)<\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

Electrical Lanes<\/p>\r\n<\/td>\r\n

\r\n

8 lanes<\/p>\r\n<\/td>\r\n

\r\n

8 lanes<\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

Form Factor Size<\/p>\r\n<\/td>\r\n

\r\n

More compact<\/p>\r\n<\/td>\r\n

\r\n

Slightly larger than QSFP-DD<\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

Port Density<\/p>\r\n<\/td>\r\n

\r\n

Higher<\/p>\r\n<\/td>\r\n

\r\n

Slightly lower<\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

Thermal Performance<\/p>\r\n<\/td>\r\n

\r\n

Moderate<\/p>\r\n<\/td>\r\n

\r\n

Superior<\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

Typical Power Support<\/p>\r\n<\/td>\r\n

\r\n

~15\u201318 W (implementation dependent)<\/p>\r\n<\/td>\r\n

\r\n

~20\u201325 W (implementation dependent)<\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

Backward Compatibility<\/p>\r\n<\/td>\r\n

\r\n

Compatible with QSFP28 \/ QSFP56<\/p>\r\n<\/td>\r\n

\r\n

No backward compatibility<\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

Typical Deployment Scenarios<\/p>\r\n<\/td>\r\n

\r\n

Cloud data centers, enterprise networks, smooth upgrades<\/p>\r\n<\/td>\r\n

\r\n

Hyperscale and AI-focused data centers<\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

Key Advantages<\/p>\r\n<\/td>\r\n

\r\n

High density, backward compatibility, mature ecosystem<\/p>\r\n<\/td>\r\n

\r\n

Better cooling, supports higher-power 800G modules<\/p>\r\n<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n

 <\/p>\r\n

QSFP-DD prioritizes port density and backward compatibility, while OSFP excels in thermal performance and high-power 800G deployments\u2014especially in next-generation AI data centers.<\/p>\r\n

 <\/p>\r\n

Conclusion: Choosing the Right Solution<\/strong><\/h2>\r\n

In summary, QSFP-DD stands out as a highly practical and forward-looking solution for 400G deployments, offering a strong balance between performance, compatibility, and cost efficiency.<\/p>\r\n

While OSFP is better suited for higher-power 800G applications, QSFP-DD remains the preferred choice for most current data center upgrades due to its flexibility and backward compatibility.<\/p>\r\n

Choosing the right form factor ultimately depends on your network architecture and future scalability needs.<\/p>\r\n

 <\/p>\r\n

 <\/p>\r\n","protected":false},"excerpt":{"rendered":"

Among the various 400G optical module form factors, QSFP-DD (Quad Small Form-factor Pluggable Double Density) has emerged as a leading solution due to its high bandwidth capacity, backward compatibility, and ability to support high port density within existing infrastructure. This article provides a detailed comparison of QSFP-DD with other mainstream optical module types, helping you […]<\/p>\n","protected":false},"author":1,"featured_media":11691,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_wpscp_schedule_draft_date":"","_wpscp_schedule_republish_date":"","_wpscppro_advance_schedule":false,"_wpscppro_advance_schedule_date":"","_wpscppro_custom_social_share_image":0,"_facebook_share_type":"default","_twitter_share_type":"default","_linkedin_share_type":"default","_pinterest_share_type":"default","_linkedin_share_type_page":"","_instagram_share_type":"default","_selected_social_profile":null},"categories":[19,1],"tags":[],"class_list":["post-466","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-products","category-technology"],"yoast_head":"\nComparison of 400G QSFP-DD with other types of optical modules<\/title>\n<meta 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