800G QSFP-DD Vs 800G OSFP: What are the differences ?

Introduction to 800G QSFP-DD and 800G OSFP Transceivers

This article will introduce the features of each 800G QSFP-DD and 800G OSFP transceivers and explain the differences between them.

800G QSFP-DD Transceivers

QSFP-DD stands for Quad Small Form Factor Pluggable Double Density. What Double Density means? What’s the difference with the QSFP, QSFP28 and QSFP56?

The 800G QSFP-DD and 400G QSFP-DD transceivers follow the same port densities system as the QSFP, QSFP28 and QSFP56 but the QSFP-DD supports eight lanes instead of four lanes for the others QSFPs, which double the density.

For the 800G QSFP-DD transceiver, each of the eight lanes will operate a data rate up to 100Gb/s providing a 800Gb/s data speed. It increases the capacity of the 400G QSFP-DD by two and the 100G QSFP28 by eight.

The 800G QSFP-DD transceiver is also called 800G QSFP-DD800, but for simplicity it is often called 800G QSFP-DD.

800G QSFP-DD DR8+ Optical Transceiver


800G OSFP Transceivers

The OSFP is a new pluggable form factor, which is slightly wider and deeper than the QSFP family. OSFP stands for Octal Small Form factor Pluggable.  As the QSFP-DD, the OSFP has 8 lanes supporting.

The OSFP transceivers family started with the development of the 400G OSFP transceiver, and thus only have two data speed rate available at the moment: 400G and 800G.

To know more about the OSFP MSA click here.

The differences between the 800G QSFP-DD and the 800G OSFP Transceivers


The width, length and thickness of 800G QSFP-DD are 18.35mm, 103mm and 8.5mm, while those of 800G OSFP are 22.58mm, 107.8mm and 13.0mm. It is obvious that the OSFP form factor is slightly wider and deeper than the QSFP-DD, but it still enables to put 36 ports in one switch slot, accumulating 14.4 Tbp/s in one slot.

Thermal Capacity and Power Consumption

Due to its slightly bigger size, the 800G OSFP transceiver has a better thermal capacity. However, a larger thermal capacity also means a higher power consumption. Obviously, the 800G QSFP-DD has a lower thermal capacity, but a better power consumption.

Backwards Compatibility

The great advantage of the 800G QSFP-DD transceiver is its backward compatibility with the QSFP, QSFP28, QSFP56 and 400G QSFP-DD. Indeed the 800G QSFP-DD ports will also support 40G, 100G, 200G and 400G which will facilitate and reduce the cost of the network migration toward the 800G.

The larger size of the 800G OSFP transceiver won’t enable the backward compatibility with the QSFP family. However, it is possible to find an adaptor (OSFP to QSFP) that supports other QSFP transceivers. The 800G OSFP is backward compatible with the 400G OSFP transceiver.


Optech Technology Co. Ltd was founded in 2001 in Taipei, Taiwan. The company was created with a sole purpose, to provide a wide and high quality portfolio of optical products to a very demanding and fast evolving market.

To respond to the permanent increase of IP traffic, Optech portfolio is constantly growing. Since the beginning, the company has always been up to date with the latest innovations on the market. Today, we are proud to deliver a large selection of 25G SFP28, 40G QSFP+, 100G QSFP28, 200G QSFP56, 400G QSFP-DD and 800G QSFP-DD optical transceivers and cables.

Optech has a large portfolio of products which include optical transceiversdirect attach cablesactive optical cablesloopback transceiversmedia converters and fiber patch cords.

Through its large selection of optical products, that have a range of data speed from 155 Mbps to 800 Gbps and reach distances up to 120km, Optech products are suitable for various industries such as telecom, data centers as well as public and private networks.

For more information about our products you can visit our website: www.optech.com.tw

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