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Recommended Long-Distance Optical Modules

For long-distance transmission over single-mode fiber, modules such as LR, ER, ZR/ZR+, and 400G coherent pluggables (DR4, FR4, LR8) are recommended depending on distance and data rate requirements.Key Long-Distance Module Types

1. LR (Long Reach) Modules

  • Distance: Typically up to 10 km over single-mode fiber (SMF)
  • Wavelength: 1310 nm
  • Use Case: Inter-building or campus connections
  • Notes: Standardized under IEEE 802.3 standards; suitable for 10G, 25G, or 400G LR4 modules 2. ER (Extended Reach) Modules
  • Distance: Up to 40 km
  • Wavelength: 1550 nm
  • Use Case: Metro networks or inter-campus links
  • Notes: Higher optical power and sensitive receivers; often used in 10GBASE-ER or 400G LR8 deployments 3. ZR/ZR+ Modules
  • Distance: 80–120 km (ZR) and beyond for ZR+
  • Wavelength: 1550 nm with coherent DSP technology
  • Use Case: Carrier-grade long-haul and metro networks
  • Notes: Coherent pluggable modules with probabilistic shaping (PCS) can reach 2,500 km at 400G and 1,200 km at 600G, making them ideal for geographically distributed networks 4. 400G Modules (DR4, FR4, LR8)
  • DR4: Medium distance (up to 500 m), single-mode fiber, PAM4 modulation
  • FR4: Uses CWDM to multiplex 4 wavelengths over a single LC duplex fiber pair, suitable for metro networks
  • LR8: Long-distance 400G module, optimized for single-mode fiber links up to 10 km or more, compatible with 800G migration strategies
Selection Considerations
  • Distance and Power Budget: Ensure Tx/Rx power levels match fiber attenuation and connector/splice losses. Use an optical power meter to verify link budget
  • Fiber Type: Long-distance modules require single-mode fiber (OS2); multimode fiber is unsuitable beyond short distances due to modal dispersion
  • Compatibility: Verify module support for your switch/router brand and DDM functionality to avoid vendor lock-in
  • Environmental Conditions: For outdoor or industrial deployments, choose industrial-grade modules with extended temperature ranges (-40°C to +85°C)
  • Future-Proofing: Consider LPO-ready 400G optics for energy efficiency and 800G readiness in data center or backbone deployments
Practical Recommendations
  • Campus/Metro Links (10–40 km): 10G/25G LR or 400G LR8 modules
  • Extended Metro/Carrier Links (40–120 km): ER or ZR/ZR+ coherent modules
  • Ultra-Long-Haul (1000+ km): PCS-enabled coherent modules at 400G–800G for intercontinental or subsea links By matching the module type to your distance, data rate, and fiber infrastructure, you can ensure reliable, high-speed connectivity while optimizing cost, power consumption, and future scalability.
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Technical note

This reference is intended for preliminary specialty-cable research. Compatibility, link budgets, fire performance, installation methods, test limits and applicable standards must be verified for the specific project.

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