Unveiling 800G Transceivers: QSFP-DD vs. OSFP Packages

While the current surge in demand is for 400G optical modules, the 800G optical network is gearing up for high-speed, high-density ports and low-latency DCI. The 800G transceiver can handle 8 billion bits per second, over twice the capacity of the previous 400G generation. This article delves into the key 800G module packages: QSFP-DD and OSFP.

What Is the Development Trend of 800G Transceiver Packaging?

The optical module is a crucial optoelectronic device facilitating photoelectric conversion in optical communication, essential to the industry. From GBIC to smaller SFP and now 800G QSFP-DD and OSFP, fibre transceiver form factors have evolved. The 800G transceiver’s progress focuses on speed, miniaturisation, and hot-swappable capability. Its applications span Ethernet, CWDM/DWDM, connectors, Fibre Channels, wired and wireless access, covering both data communication and telecom markets.

800G Transceiver Form Factors Advantages

800G QSFP-DD Form Factor:

The QSFP-DD is a dual-density, four-channel small pluggable high-speed transceiver, currently favoured for 800G optical applications, aiding data centres in flexible scalability. It employs 8-channel electrical interfaces, supporting rates up to 25Gb/s (NRZ modulation) or 50Gb/s (PAM4 modulation) per channel, offering aggregation solutions of up to 200Gb/s or 400Gb/s.

Advantages of the 800G QSFP-DD:

  • Backward compatibility with QSFP+/QSFP28/QSFP56 packages.
  • Utilises a 2×1 stacked integrated cage and connector, supporting single-height and double-height cage connector systems.
  • Features SMT connectors and 1xN cages, optimising heat capacity to at least 12 watts per module, reducing heat dissipation costs.
  • Designed with flexibility in mind by the MSA working group, adopting ASIC design, supporting various interface rates, and maintaining backward compatibility (QSFP+/QSFP28), reducing port and deployment costs.

800G OSFP Form Factor:

The OSFP represents a new generation of optical modules, smaller than CFP8 yet slightly larger than QSFP-DD. It features eight high-speed electrical channels supporting 32 OSFP ports on a 1U front panel, enhanced by an integrated heat sink for superior heat dissipation.

Advantages of the 800G OSFP:

  • OSFP is designed with an 8-channel (Octal or 8-lane) configuration, supporting a total throughput of up to 800G, enabling greater bandwidth density.
  • Its support for more channels and higher data transfer rates translates to enhanced performance and longer transmission distances.
  • The OSFP module boasts excellent thermal design, capable of handling higher power consumption effectively.
  • With a larger form factor, OSFP is poised to support higher rates in the future, potentially reaching 1.6T or higher due to its increased power handling capacity.

800G Transceiver Form Factors Parameter Comparison:

Electrical Lanes88
Single Lane Rate25Gbps/50Gbps/100Gbps25Gbps/50Gbps/100Gbps
Total Max Data Rate200G/400G/800G200G/400G/800G
Backward Compatibility with QSFP+/QSFP28YesNo
Port density in 1U3636
Bandwidth in 1U14.4Tb/s14.4Tb/s
Power consumption Upper Threshold12W15W
ProductsTransceiver Modules; DAC & AOC cablesTransceiver Modules; DAC & AOC cables

Fibre producers favour OSFP and QSFP-DD. While the latter is typically preferred for telecommunications applications, the former is seen as more suitable for data centre environments.

How to Choose 800G Transceiver for Your Data Center?

To select the appropriate 800G transceiver for your network application, thorough evaluation of factors like transmission distance, fibre type, and form factor is crucial.

The 800G QSFP-DD module utilises Broadcom 7nm DSP chip and COB packaging, with an MTP/MPO-16 connector. However, different models of the 800G QSFP-DD module vary in power consumption and transmission distance. It is suitable for high-speed network environments such as data centres, cloud computing, and large-scale networks, meeting the demand for high bandwidth and large-capacity data transmission.

FS P/NPower ConsumptionDistanceSMF/MMF

The 800G OSFP module also features Broadcom 7nm DSP chip and COB packaging. However, it comes in two types: Ethernet and Infinite Bandwidth, with variations in power consumption and connectors between different models. It is suitable for networks like data centres, cloud computing, and ultra-large-scale networks.

FS P/NPower ConsumptionConnectorDistanceSMF/MMF
OSFP800-2LR4-A2≤18WDual LC Duplex10kmSMF
OSFP800-PLR8-B2≤16.5WDual MTP/MPO-1210kmSMF
OSFP-2FR4-800G≤18WDual LC Duplex2kmSMF
OSFP800-XDR8-B2≤16.5WDual MTP/MPO-122kmSMF
OSFP-DR8-800G≤16WDual MTP/MPO-12500mSMF
OSFP-SR8-800G≤15WDual MTP/MPO-1250mMMF
OSFP-DR8-800G≤16.5WDual MTP/MPO-12500mSMF
OSFP-2FR4-800G≤16.5WDual MTP/MPO-122kmSMF


As technology continues to progress and innovate, we anticipate 800G optical modules will increasingly contribute to practical applications and drive advancements in the digital communication sector.

FS offers a range of 800G optical modules to meet your network construction needs. Visit the FS website for information and enjoy free technical support.

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