Evolution from 10G to 100G for a Metro Network

Is your 10G network reaching its limit? With data traffic growing 40% annually, 10G networks are struggling to keep up. Users demand higher capacity and longer reach—especially in metro networks. The rise of PAM4, DWDM, and coherent technologies is now making 100G upgrades both necessary and achievable.

Understanding the Role of Metro Networks

Metro networks are public network infrastructures designed to transport data efficiently across city-scale distances. These networks connect local area networks (LANs) to larger wide area networks (WANs), enabling seamless communication and services such as cloud access, content delivery, and enterprise connectivity. As user traffic and application complexity grow, upgrading metro networks to support higher capacities becomes critical.

Coherent Transceivers Market Insights

Market trends reveal that coherent optics are playing a leading role in driving this upgrade. While 100G coherent port shipments remain steady, 200G and 400G coherent technologies are gaining momentum rapidly. Coherent 400G+ and 200G solutions are especially popular at the network core, whereas lower-speed options like Direct Detect and 400ZR are more suited to the network edge. This growth is fueled by the need for more flexible and scalable solutions capable of meeting the evolving demands of cloud computing, 5G backhaul, and high-definition content delivery.

FS coherent modules support 100G/200G/400G transmission and are available in multiple form factors, including QSFP28, QSFP-DD, and CFP2. They are compatible with QSFP28 and QSFP-DD ports for direct deployment in switches and routers, while the compact, pluggable CFP2 module is designed to meet the demands of high-speed data transmission.

The FS D7000 CFP2 module supports advanced modulation formats including PM-16QAM, PM-8QAM, and PM-QPSK, enabling flexible adaptation to various transmission distances and bandwidth requirements. It features wavelength and power tunability for enhanced performance optimization across diverse optical paths. Fully compliant with CFP2 MSA and CFP MSA standards, the module ensures interoperability and reliability in modern network environments. With built-in digital optical monitoring, it provides strong diagnostic capabilities for real-time performance insights and fault localization. Designed with Class 1 laser safety, hot-pluggability, and LLDP support, the D7000 CFP2 offers a powerful, safe, and intelligent solution for high-capacity optical transport. In Metro Networks, it plays a vital role by supporting high-speed, short-to-medium range transmissions, efficiently handling large volumes of data traffic between data centers, central offices, and edge nodes—ensuring low latency, high bandwidth, and scalability in densely populated urban communication infrastructures.

Upgrade Paths: From 10G to 100G

There are two common upgrade paths for metro network evolution:

10G → 40G → 100G

10G → 25G → 100G

Both approaches offer distinct advantages in terms of scalability, cost-efficiency, and power consumption. By transitioning to 100G networks, operators can support higher density deployments while maintaining low operational expenditure and power usage.

Core Technologies for 100G Deployment

Several technologies have emerged to support the implementation of 100G metro networks:

Coherent CFP Technology

Digital coherent CFP transceivers are capable of long-distance transmission—reaching over 1000 km between sites. This makes them ideal for core metro applications where performance and distance are critical.

PAM4 QSFP28

As a cost-effective and power-efficient solution, PAM4-based QSFP28 modules enable 100G and beyond in data centers and shorter-reach metro applications.

DWDM Technology

DWDM plays a vital role in maximizing fiber capacity and enabling long-distance data transport across the metro area network (MAN). It also enhances scalability through flexible wavelength provisioning.

FS 100G Solution Recommendations

To help enterprises and service providers navigate the 10G to 100G transition, FS offers a portfolio of high-performance optical solutions, including:

100G/200G CFP Coherent Transceivers

Ideal for long-haul and metro transport networks, supporting high-capacity optical transmission.

100G DWDM QSFP28 PAM4 Transceivers

Delivering cost-effective DWDM support for high-density metro applications.

DWDM Mux/Demux

Essential for optimizing bandwidth and simplifying wavelength management in optical systems.

Conclusion

The journey from 10G to 100G in metro networks is more than a linear speed increase—it is an evolution that involves intelligent technology adoption, careful network planning, and strategic investments. By leveraging coherent optics, DWDM, and next-generation transceiver technologies, service providers can unlock new levels of performance and future-proof their infrastructure for the digital age.