Optical module Lr distance
LR (Long Reach) optical modules typically support transmission distances of 2 km to 10 km over single-mode fiber.
Overview of LR Modules
LR modules are designed for longer-distance connections compared to SR (Short Reach) modules. They generally operate at a wavelength of 1310 nm and are optimized for single-mode fiber (SMF), which allows for lower signal attenuation over longer distances . LR modules are commonly used in backbone links, enterprise networks, and data center interconnects where distances exceed the reach of multimode fiber SR modules .
Typical Distance Ranges
- Gigabit Ethernet (1000BASE-LR): Up to 10 km over single-mode fiber .
- 10 Gigabit Ethernet (10GBASE-LR): Also supports up to 10 km over single-mode fiber .
- 100 Gigabit Ethernet (100GBASE-LR4): Can reach 10 km using OS2 duplex single-mode fiber . For distances shorter than 300 meters, SR modules are more cost-effective, while LR modules are preferred for medium to long distances between 2 km and 10 km .
Key Considerations
- Fiber Type: LR modules require single-mode fiber (G.652 or G.657) for optimal performance .
- Laser Type: LR modules typically use DFB lasers for stable long-distance transmission .
- Network Design: Choosing LR modules ensures reliable throughput over longer links and avoids the need for signal amplification or repeaters in medium-range deployments . In summary, LR optical modules are ideal for distances ranging from 2 km to 10 km over single-mode fiber, bridging the gap between short-range SR modules and extended-reach ER or ZR modules, while providing a balance of performance and cost .
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