A Comprehensive Guide to the 100GBASE-SR4 Optical Module and Its Applications in Networking

The 100GBASE-SR4 optical module, also known as the QSFP28 SR4 transceiver, is a fiber optic transceiver designed for high-speed data transmission in data centers, server applications, and cloud computing applications. This blog provides a comprehensive guide to the 100GBASE-SR4 optical module, exploring its technical features, benefits, applications, and limitations.

Understanding the Technical Features of a 100GBASE-SR4 Optical Module

The QSFP28 SR4 specification is designed to support high-speed data transmission over fiber optic cables. This module uses parallel transmission, which means that data is transmitted simultaneously over multiple optical fibers. The QSFP28 SR4 module uses four laser diodes to transmit data and four photodiodes to receive data. The QSFP28 SR4 module uses an MPO connector to connect with the 100GBASE-SR fiber optic cable. The QSFP28 SR4 speed can reach up to 103.1 Gbps.

What are the Benefits of Using a 100GBASE-SR4 Optical Module in Networking?

Using a 100GBASE-SR4 optical module in networking can offer several benefits. Firstly, it can improve network performance by providing higher bandwidth and faster data transmission speeds. Secondly, it can help to create more reliable networks by reducing the risk of data loss or signal interference. Thirdly, it can create low-latency networks that are essential for real-time applications such as video streaming, online gaming, and stock trading.

What Applications Can Be Supported by the QSFP28 SR4 Transceiver?

The QSFP28 SR4 transceiver can support a wide range of applications in different industries. In the data center industry, it is used for high-speed data transmission between servers, switches, and storage devices. In the server industry, it is used for connecting servers to the network. In cloud computing applications, it is used for high-speed data transmission between servers and data centers.

The future of optical modules looks promising, with new advancements in technology and design making them more reliable and efficient than ever before. One such advancement is the use of silicon photonics, which is a technology that allows for the integration of optical components onto a silicon substrate. This technology has the potential to significantly reduce the cost of optical modules, making them more accessible to a wider range of applications.

In addition, the emergence of 5G technology and the Internet of Things (IoT) is expected to drive the demand for optical modules even further. These technologies require fast and reliable data transmission, and optical modules are ideally suited to meet these needs.

How Does a QSFP28 SR4 Optical Module Work?

The QSFP28 SR4 module works by converting electrical signals into optical signals using laser diodes. The optical signals are then transmitted over multiple optical fibers using parallel transmission. The optical signals are then received by photodiodes, which convert the optical signals back into electrical signals.

Understanding the Limitations of a 100GBASE-SR4 Optical Module and How to Overcome Them

One of the limitations of the QSFP28 SR4 module is the distance limitation. The module is designed to transmit data up to a distance of 70 meters using OM3 fiber optic cable or up to a distance of 100 meters using OM4 fiber optic cable. To overcome this limitation, mode conditioning patch cables can be used. These cables help to ensure that the transmitted light is properly aligned with the receiving fiber.

Another limitation of the QSFP28 SR4 module is the power budget limitation. This limitation is caused by the fact that the module uses four laser diodes to transmit data. To overcome this limitation, the use of amplifiers or repeaters can be considered. These devices can help to boost the signal strength and extend the reach of the module. Also, the brand optical will get a higher price, for example, the Dell 100GBASE-SR4 optical module is more expensive than the OEM manufacturer.


Optical modules such as the 100GBASE-SR4 optical module are becoming increasingly important in networking as the demand for high-speed data transmission continues to grow. As technology advances and data rates increase, optical modules will play a crucial role in meeting the needs of businesses and consumers alike.

Overall, the 100GBASE-SR4 optical module is a powerful tool for high-speed data transmission in a variety of networking applications. Its technical features, benefits, applications, and limitations make it an essential component in modern networking solutions. As technology continues to advance and data rates increase, the importance of optical modules such as the 100GBASE-SR4 will only continue to grow.

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