top of page

QSFP28 LR4 Overview

As demand for 100G continues to grow in the market driven predominantly by data center applications, QSFP28 optical transceivers have emerged as the preferred modules. This article provides a detailed overview of the 100G QSFP28 LR4 transceiver.


The 100G QSFP28 LR4 transceiver is designed for transmission over a distance of up to 10km using single mode fiber and with a working bandwidth of 1295nm to 1310nm. Just like most QSFP28 modules, the 100G QSFP28 LR4 transceiver converts four 25Gbps electrical signals in four LAN WDM optical signals and then proceeds to multiplex them into a single 100G channel for transmission over fiber. This process is reversed at the receiving end with the 100G signal received on the fiber demultiplexed into four LAN WDM optical signals before being converted back to four 25Gbps electrical signals


The table below provides detailed specifications of the 100G QSFP28 LR4 transceiver.

Form Factor



​1296nm, 1300nm, 1305nm, 1309nm


LC Duplex

Cable Type


Data Rate

103.125Gbps (4x 25.78Gbps)

Transmission Reach

10 km

Transmitter Type



IEEE 802.3ba 100GBASE-LR4, IEEE 802.3bm, QSFP28 MSA, SFF-8665, SFF-86


The 100G QSFP28 LR4 is designed primarily for the transmission of 100G Ethernet (fully compliant with IEEE 802.3ba standard) and with a 10km transmission reach it is ideal for use in large scale and super large scale data centers.

It is also perfectly suited for direct connections between 100G switches in different locations within and enterprise network as illustrated in the diagram below.

GigOptics - Your Trusted Source for Optics

At GigOptics, we offer a wide range of optical transceivers including all 100G QSFP28 LR4; all tested to ensure quality and reliability. For more information, contact us at

122 views0 comments

Recent Posts

See All


bottom of page