LR optical module wavelength

LR (Long Reach) optical modules typically operate at a wavelength of 1310nm over single-mode fiber.LR modules are designed for long-distance data transmission, generally up to 10 kilometers, making them suitable for campus backbones, inter-building links, or metropolitan network connections . The 1310nm wavelength is ideal for single-mode fiber (SMF) because it minimizes signal attenuation and dispersion, ensuring stable transmission over extended distances . This contrasts with SR (Short Reach) modules, which operate at 850nm over multimode fiber and are limited to a few hundred meters .Key Characteristics of LR ModulesWavelength: 1310nmFiber Type: Single-mode fiber (SMF)Typical Maximum Distance: ~10 km (can vary slightly depending on module and fiber quality)Use Cases: Campus networks, data center interconnects, and long-haul enterprise linksAdvantages: Reduced signal loss, minimal modal dispersion, and reliable long-distance performanceComparison with Other ModulesSR (Short Reach): 850nm, multimode fiber, up to 300–400 metersER (Extended Reach): 1550nm, single-mode fiber, up to 40 kmZR (Zettabyte Range): 1550nm, single-mode fiber, up to 80 km Using the correct wavelength and fiber type is critical. Mismatching LR modules with multimode fiber or using SR modules for long distances can result in signal degradation, unstable connections, or link failure . In summary, LR optical modules operate at 1310nm, optimized for single-mode fiber to achieve reliable long-distance transmission, distinguishing them from short-range or extended-range modules in both wavelength and deployment scenarios .