As global data traffic continues to surge, metro networks have become a critical layer in connecting data centers, enterprises, and service providers across cities and regional clusters. The challenge for network operators lies in meeting the increasing bandwidth demands while keeping costs and complexity under control. In this context, the 100G IR4 optical transceiver has emerged as an optimal solution, striking a balance between distance coverage and affordability.
Why Metro Networks Need the Right Balance
Metro networks typically span distances of 10 to 80 kilometers, linking data centers, enterprise campuses, and aggregation points. While short-reach transceivers such as 100G SR4 are cost-effective, their range is limited to a few hundred meters, making them unsuitable for metro use. On the other hand, long-reach solutions like 100G LR4 or even ER4 can handle distances up to 40 km or beyond, but they often come with significantly higher costs and power consumption.
This creates a clear gap in the 10 to 20km range, which is common in metro deployments. That is where 100G IR4 steps in, providing the ideal combination of distance capability and cost efficiency.
What is 100G IR4
The 100G IR4 module is an optical transceiver designed to support 100 Gigabit Ethernet over single-mode fiber with transmission distances typically up to 20 kilometers. It uses four lanes of 25Gbps, multiplexed to deliver an aggregate 100Gbps data rate. IR4 follows the IEEE 802.3ba standard for 100G Ethernet and operates within the O-band (around 1310 nm), which ensures lower dispersion and stable transmission quality.
Advantages of 100G IR4 in Metro Networks
Cost Efficiency: Compared to 100G LR4 or ER4 modules, IR4 offers a lower-cost alternative for mid-range metro deployments. It avoids the expense of long-haul optical components while still meeting distance requirements.
Optimized Reach: With support for up to 20 km, IR4 precisely matches the typical distances seen in citywide or regional network interconnections. It eliminates the need to overinvest in longer-reach modules when 20 km is sufficient.
Lower Power Consumption: IR4 modules generally consume less power than LR4 or ER4, reducing operational costs and easing thermal management in dense equipment racks.
Compatibility with Existing Infrastructure: IR4 can be deployed using standard single-mode fiber already present in metro networks, minimizing the need for new cabling investment.
Application Scenarios
Data Center Interconnect (DCI): Enterprises and service providers often need to connect data centers across a city or between nearby regions. IR4 offers reliable 100G links at 10–20 km without incurring the high costs of LR4/ER4.
Campus-to-Campus Links: Large organizations with multiple campuses in a metropolitan area can use IR4 modules to ensure high-bandwidth, low-latency communication between sites.
Service Provider Aggregation: Telecom operators can leverage IR4 in aggregation layers to connect access networks to metro cores efficiently, supporting the ever-growing demand from mobile and broadband services.
Conclusion
The 100G IR4 module has carved out a crucial role in modern metro networks. By offering sufficient reach (10–20 km) at a more accessible price point, it fills the gap between short-range SR4 and costly LR4/ER4 solutions. For network operators seeking to scale bandwidth without overspending, IR4 delivers the right balance of performance, cost, and efficiency. As bandwidth demands continue to grow, 100G IR4 will remain a practical and strategic choice for metro deployments, ensuring networks are both future-ready and economically sustainable.