Empowering Your DCI Networks with FS All-In-One 100G DWDM PAM4 Solution

With the massive growth in data center construction, the demand for Data Centers Interconnect has multiplied. In the case of distributed data centers, the interconnection relies heavily on a large number of optical transmission devices. The utilization of 100G DWDM PAM4 technology has revolutionized data transmission capabilities. The 100G DWDM PAM4 technology allows for the transmission of four different signal levels, effectively doubling the data capacity compared to traditional NRZ-based solutions. This increased capacity enables efficient utilization of the available bandwidth, maximizing the potential of high-speed connections between data centers. However, despite its advantages, it is important to consider some of the challenges and limitations associated with 100G DWDM PAM4 technology. This article aims to discuss the limitations of 100G DWDM PAM4 technology in the field of Data Center Interconnect (DCI) and how FS addresses them.

The Main Challenges of Current 100G DWDM PAM4 Solution

As to current 100G DWDM PAM4 solution, lots of optical equipment are needed, like DWDM PAM4 modules, Mux Demux, EDFA, DCM, etc. First, DWDM signals are transmitted from switch to the Mux. The Mux then multiplexes multiple signals into fiber pairs. For long distance transmission, dispersion compensation (DCM) and EDFAs are used to amplify the signals. All the cards are installed in the rack, and proper connections between the cards are crucial to avoid any errors. In this way, the configuration and parameters for each board should be set separately. If the existing switch does not support DWDM signals, you have to try a compatible switch or purchase an additional OEO converter to convert the 1310nm/850nm signals into DWDM signals before transmitting them to the Mux.

Figure 1: The Current 100G DWDM PAM4 Solution

So when you choose this 100G DWDM PAM4 network solution, you may often encounter the following challenges:

• Complex Installation of Equipment: Implementing 100G DWDM PAM4 requires sophisticated optical transmission equipment, including Mux Demux, EDFA, VOA, and other components, which may involve complex installation and specialized expertise. It can pose challenges during the deployment phase.

• Shortage of Skilled Professionals: In data center interconnection, the unique characteristics of optical analog signals and the increasing data volumes present new challenges for IT personnel. They often lack expertise in optical transmission knowledge, while the growing number of equipment requires fast and accurate service provisioning and troubleshooting.

• High Costs: The price of 100G PAM4 modules is relatively high compared to other modules, due to the complexity of design and the advanced modulation techniques used. And, the compatibility requirements between switches and DWDM signals can result in additional expenses. The cost can be a significant investment for organizations implementing DCI solutions, potentially impacting the overall project budget.

• Limited Optical Fiber Resources: As the scale of data centers continues to expand, the demand for data center interconnection has also doubled. However, fiber resources are not countless. When the demand for interconnecting data centers exceeds the available fiber capacity, it can lead to bottlenecks, congestion, and reduced performance.

• High Power Consumption: 100G PAM4 transmission typically requires higher power consumption given the complexity of the modulation scheme. Managing power consumption and heat dissipation within data center environments can be critical to ensuring reliable and efficient operation. Or it may cause the shutdown, accelerate component degradation and reduce lifespan.

How Does FS Address Current 100G DWDM PAM4 Solution Issues？

FS understands the challenges associated with PAM4 solutions in the field of Data Center Interconnect and is dedicated to finding approaches.

Integrate the Components

In traditional DWDM PAM4 Solution, a chassis is commonly equipped with various cards, including transponders and muxponders. Moreover, the users often need to purchase additional optical-layer cards like EDFA, DCM, OLP to strengthen the data transmission quality, and then establish interconnections between these cards. To extend the transmission distance and mitigate noise interference, EDFAs, DCMs and VOAs are must-haves for PAM4 signals. There are many products needed in a DWDM PAM4 solution. However, FS recognizes the need for optimization. As the optical-layer cards we need are obvious, why not integrate them into a unified solution?

Integrating various types of EDFA (PA, BA, LA) and DCM into a single device is a common practice for optical network manufacturers, which provides significant convenience to users. This consolidation allows one device to replace multiple boards and supports multiple functionalities. Building upon this concept, we can also consider integrating the required Mux Demux, EDFA, DCM, and VOA components within the DWDM PAM4 solution.

Figure 2：DWDM PAM4 Solution with EDFA and DCM

Eliminate the Compatibility Problem

Then we encountered new problems. The DWDM PAM4 solution requires the switches to support DWDM PAM4 signals to connect with the transmission equipment. If the existing switches do not allow for DWDM PAM4 modules, customers may need to purchase new equipment or abandon the PAM4 solution due to budget constraints. DWDM PAM4 modules have specific requirements and not all devices can accommodate them. Is it possible to substitute them with widespread compatible modules such as 100G SR4, but still transmit DWDM PAM4 signals?

To address this issue, We have a new approach: embedding the DWDM PAM4 modules in the equipment. This means that users only need 100G SR4/LR4/IR4 modules on the port rather than expensive DWDM PAM4 modules. Consequently, there is no longer a strict requirement for switches/routes.

Reduce Optical Fiber Usage

Due to the limited availability of optical fiber resources, many users are seeking ways to optimize their fiber utilization. Single-fiber solutions have emerged as a favorable approach. Given the demand, FS has further enhanced the DWDM PAM4 solution by incorporating a Red/Blue filter within the equipment. This innovative enhancement enables the transmission of signals over a single optical fiber, effectively reducing the overall consumption of fiber resources in Data Center Interconnect (DCI) transmission.

Simplify the Configuration

The existing DCI wavelength division multiplexing (WDM) systems are complex, with multiple fiber connections between cards, requiring professional personnel to configure services and optical-layer parameters. It is challenging for inexperienced individuals to handle, and the workload is substantial. In such cases, the automated configuration becomes particularly crucial. In our new solution, EDFAs and DCMs have been integrated into a single platform for centralized management. We can add the function of automated configuration and zero-touch provisioning. The platform can automatically adjust dispersion compensation and gain values based on the link.

FS Recommends Alternative 100G DWDM PAM4 Solution for DCI

As the challenges and customer demands discussed above, FS has developed a comprehensive solution that addresses the need for integration, compatibility, fiber resource optimization and easy deployment in DWDM PAM4 transmission, which is a single-fiber 100G DWDM PAM4 DCI solution centered around the DCP920 Series. Let's delve into the specifics of the product and solution.

Figure 3: The Feature of DCP920 Series

DCP920 Series feature an all-in-one design, integrating 100G PAM4 modules, Mux Demux, EDFAs, DCMs, VOAs, and Red/Blue filters in a 1U platform for a simplified DCI Network. Given the embedded DWDM PAM4 modules, users can simply connect the switch and the platform with 100G SR4/LR4/IR4 modules, and the platform converts the 1310nm/850nm signals into 100G DWDM PAM4 signals and transmit to the other end. There is no need for manual installation of additional components such as EDFAs or DCMs.

The 100G DWDM PAM4 solution is typically applied for point-to-point Data Center Interconnection over a single fiber for 80KM transmission. It integrates all the components and functions we need in a 100G DCI solution. It's a plug-and-play system. With just two platforms, it can replace all the required cards and professionals. Furthermore, this solution supports automated management and configuration, allowing it to automatically adjust the parameters of EDFAs (BA, PA) and DCMs based on the current link conditions, without manual intervention. This feature makes it particularly user-friendly for novice users. A staff with no specialized knowledge of optical transmission services can also operate it.

Figure 4：The FS Point-to-point 100G DWDM PAM4 DCI Solution

What Will You Get by Applying FS 100G DWDM PAM4 Solution?

After introducing FS 100G DWDM PAM4 solution, we can sum up the following key advantages:

• All-in-one Design for Easy Installation: The solution is an all-in-one design, integrating DWDM PAM4 modules, Mux Demux, EDFAs, DCMs, VOAs and Red/Blue Filter in a 1U platform, and you don't need to install multiple cards but just one platform, which saves time for installation.

• Cost Reduced by 30%: With the embedded 100G DWDM PAM4 modules, the solution possesses widespread compatibility and can save you money. The optical transceivers and switches in this solution are not required for supporting DWDM signals. It eliminates the need to purchase DWDM modules or additional optical-layer cards. You can use the 100G SR4/LR4/IR4 modules to transmit DWDM PAM4 signals, with it to upgrade the network infrastructure without replacing the existing equipment. With its integrated design, you can significantly reduce your expenses by up to 30%.

• Zero-touch Configuration: The solution features plug-and-play and zero-touch configuration. Optical power and dispersion can be configured automatically, which eliminates the need to individually set and adjust dispersion values, gain, or power, allowing for easy maintenance even without specialized skills.

• 800G High Capacity: The 100G DWDM PAM4 Solution not only enables efficient transmission of 100G signals but also provides the capability to support higher capacities such as 400G and 800G within limited space. It maximizes the utilization of existing infrastructure and allows for seamless scalability to meet growing bandwidth demands.

• 0.44 W/G Low Power Consumption: With its optimized design, the solution achieves an impressively low power consumption of 0.44 W/G. This remarkable power efficiency reduces operational costs and also contributes to environmental sustainability by minimizing energy consumption and carbon footprint.

• One-to-one Professional Technical Support: FS can tailor the Data Center Interconnect Solution to meet your needs, provide demo experience, support online training, and offer end-to-end network deployment and integration services, ensuring continuous support throughout your network journey.

Conclusion

The FS 100G DWDM PAM4 Solution serves applications such as point-to-point Data Center Interconnection, DWDM-based 100G metro access, campus and enterprise links, and 5G mobile access architecture. In data center DCI applications with distances ranging from 0-80km/120km, 100G PAM4 technology can compete for market share against more costly coherent 100G DWDM technology. Once again FS showed the strength of providing advanced solutions to meet market demand. Contact us now to explore this amazing 100G DWDM PAM4 Solution.