40km optical module operating distance
A 40km optical module is designed to support transmission distances of up to 40 kilometers over single-mode fiber.
Overview
A 40km optical module, such as 40GBASE-ER4, 100G ER4L, or 10GBASE-ER, is engineered for long-reach Ethernet or optical transport applications. These modules are typically used in data center interconnects (DCI), metropolitan area networks, and telecom backbone networks where distances exceed the reach of standard LR (10km) or SR (short-range) modules .
Technical Details
- 40GBASE-ER4 QSFP+: Uses four CWDM wavelengths over a single-mode fiber pair to achieve 40Gbps transmission up to 40km. It multiplexes four ~10Gbps electrical lanes into optical signals and demultiplexes them at the receiver, supporting long-distance connectivity without complex DWDM systems .
- 100G ER4L QSFP28: Operates at 1310nm over single-mode fiber, supporting 100Gbps with a maximum reach of 40km when FEC (Forward Error Correction) is enabled, or around 30km without FEC .
- 10GBASE-ER SFP+: Extends 10Gbps Ethernet up to 40km over single-mode fiber at 1550nm, with a typical optical link budget of 15 dB, suitable for metro and long-haul links .
Key Considerations
- Fiber Type: Single-mode fiber (SMF, e.g., G.652) is required for 40km reach. Multi-mode fiber is generally limited to shorter distances.
- FEC: Enabling FEC can extend the effective reach by improving signal integrity over long distances.
- Wavelengths: Modules use specific wavelengths (e.g., 1271–1331nm for 40GBASE-ER4, 1310nm for 100G ER4L) optimized for long-distance transmission.
- Deployment Scenarios: Ideal for scenarios where 10km or 20km optics are insufficient but full DWDM systems are unnecessary, such as extended campus networks or metro links . In summary, a 40km optical module reliably supports distances up to 40 kilometers over single-mode fiber, with performance influenced by FEC, fiber quality, and module type. These modules provide a cost-effective solution for high-speed, long-reach network connections without requiring complex amplification or DWDM infrastructure .
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