Furthest optical module

ZR (Zero-Dispersion Range) optical modules offer the longest reach, supporting distances up to 80–120 kilometers over single-mode fiber.

Overview of Optical Module Ranges

Optical modules are categorized by their maximum transmission distance and fiber type:

• VR (Very Short Range): 0–100 meters, multimode fiber, used for intra-rack connections .
• SR (Short Range): Up to 300 meters, multimode fiber, for short data center links .
• DR (Distance Range): Up to 500 meters, single-mode fiber, for inter-data center links .
• FR (Long Range): Up to 2 kilometers, single-mode fiber, for longer network connections .
• LR (Long Range): Up to 10 kilometers, single-mode fiber, suitable for wide-area networks .
• ER (Extended Range): Up to 40 kilometers, single-mode fiber, for extended reach applications .
• ZR (Zero-Dispersion Range): Typically supports 80–120 kilometers, single-mode fiber, designed for ultra-long-haul transmission .

High-Bandwidth Long-Reach Modules

Next-generation modules, such as XPO (eXtra-dense Pluggable Optics), support extremely high bandwidth (up to 12.8 Tbps per module) while accommodating long-reach standards including DR, FR, LR, and ZR . These modules are designed for AI data centers and hyperscale networks, combining high density with operational flexibility.

Practical Considerations

• Fiber Type: Longest distances require single-mode fiber; multimode fiber is limited to short distances.
• Power and Cooling: High-power modules like XPO may require liquid cooling to maintain performance over long distances .
• Applications: ZR modules are ideal for long-haul metro and intercity networks, while LR and ER modules are common in enterprise WANs and data center interconnects. In summary, for the furthest optical reach, ZR modules are the standard choice, capable of transmitting data over 80–120 km on single-mode fiber, with advanced modules like XPO enabling high-bandwidth, long-distance connectivity in modern AI and hyperscale networks .