The Power of QSFP28 PAM4: Revolutionizing Data Transmission

The growing demand for faster, more efficient data transmission has led to the development and adoption of innovative technologies like the QSFP28 PAM4. This technology, combined with 100G DWDM QSFP28 and 100G coherent transceivers, is setting new benchmarks in the data communication industry. This blog post will explore the concept of PAM4 technology, its application in 100G/400G environments, and the advantages it brings to the table.


What Is PAM4 Technology?

Pulse Amplitude Modulation with 4 levels, or PAM4, is a modulation technique that allows four different pulse amplitudes, effectively doubling the data rate transmitted over a given channel. Unlike traditional binary systems (PAM2) that utilize two levels to represent data, PAM4 employs four levels, thereby doubling the amount of information transmitted in a single operation.

How Does PAM4 QSFP28 Apply for 100G/400G Applications?

In a world where the volume of data transmission is constantly increasing, technologies like PAM4 QSFP28 play a crucial role in addressing the needs of high-speed networks, particularly in 100G and 400G applications.

Large Data Capacity

One of the significant advantages of QSFP28 PAM4 is its ability to carry large data capacities. By utilizing four amplitude levels in its data encoding process, PAM4 effectively doubles the data rate. This increase in data capacity is essential in data center interconnects (DCIs), where data needs to be transmitted and processed at incredibly high speeds.

Lower Power Consumption

Another major benefit of the PAM4 QSFP28 is its lower power consumption. Despite delivering higher performance levels and faster data rates, PAM4 technology consumes less power compared to traditional coherent technology. This feature makes it a more sustainable and cost-effective option for data centers and other large-scale network applications.

Cost Effective

The cost-effectiveness of PAM4 QSFP28 extends beyond its power consumption. PAM4-based transceivers, particularly the 100G PAM4, are cheaper than their 100G coherent counterparts, making them an ideal solution for organizations seeking to optimize their network capabilities while managing costs effectively.

100G DWDM DCI Solution

The combination of PAM4 QSFP28 with 100G DWDM provides a powerful solution for data center interconnects. The PAM4 modulation enhances the capacity and efficiency of the DWDM systems, ensuring seamless data transmission over long distances, which is a critical requirement in DCI applications. DCMs are used to correct the pulse spreading that occurs as light travels through the fiber, which can potentially impact the quality and speed of data transmission. EDFA line cards, on the other hand, amplify the optical signal to ensure that it remains strong and clear, even over long distances.

In light of the numerous benefits they offer, QSFP28 PAM4 DWDM modules have become an increasingly popular choice for a range of 100G and 400G applications. These include point-to-point data center interconnects (DCI), 100G Ethernet metro-access over DWDM, campus and enterprise links, and even 5G mobile access architecture.


QSFPTEK has emerged as a leader in providing high-quality, high-performance network solutions. QSFPTEK’s 100G DWDM QSFP28 PAM4 solution exemplifies this, offering a comprehensive solution for high-capacity data transmission needs.

80km DCI with DCM, EDFA Line Cards

QSFPTEK’s 100G DWDM QSFP28 PAM4 solution is designed to cover long distances, offering a reach of up to 80km. By leveraging Dispersion Compensation Modules (DCM) and Erbium-Doped Fiber Amplifier (EDFA) line cards, this solution ensures that data transmission remains reliable and efficient even over long distances. Embracing the advantages of embedded DWDM technology, the QSFP28 PAM4 DWDM transceivers are pluggable, allowing for direct insertion into suitable data center routers or switches. This eliminates the need for a separate DWDM converter platform, simplifying the deployment and maintenance process while also significantly reducing the overall cost.

These transceivers incorporate advanced PAM4 technology to ensure high-speed, reliable data transmission, making them a crucial element in today’s high-capacity data centers. Their compact and pluggable design facilitates efficient use of space and seamless integration with existing network equipment, thus providing considerable operational and economic advantages.

However, to fully leverage the capabilities of these PAM4 DWDM transceivers, certain additional considerations come into play, particularly when dealing with long-distance transmissions. Dispersion Compensation Modules (DCMs) and Erbium-Doped Fiber Amplifier (EDFA) line cards play a crucial role in ensuring optimum performance over longer distances.


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