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Maximum optical module

ODN and passive infrastructure knowledge brief Published 05 Oct 2023

Prepared for preliminary research by the GESTIONVAL ODN knowledge desk. Confirm network topology, split ratio, box or cabinet capacity, joint closure rating and loss budget against current standards and product documentation.

The current maximum optical module in commercial deployment is 1.6T, with 800G widely adopted and 400G as the baseline standard.Overview of Optical Module Evolution

Optical modules are optoelectronic devices that convert electrical signals into optical signals and vice versa, enabling high-speed data transmission over fiber networks. They operate at the physical layer of the OSI model and are essential in data centers, telecom networks, and AI-scale computing environments . Modules vary in form factor, including SFP, SFP+, SFP28, QSFP, and QSFP-DD, with higher-capacity modules often using co-packaged optics or silicon photonics for efficiency .

Bandwidth and Performance
  • 400G Modules: Standard in hyperscale and enterprise networks, using PAM4 modulation and multiple fiber channels to achieve 400 Gbps. Transmission distances range from very short (VR, 0–100 m) to extended range (ER, up to 40 km) depending on fiber type and module design .
  • 800G Modules: Provide double the bandwidth of 400G with 30–40% better power efficiency per bit. They reduce fiber count and are increasingly deployed in AI clusters and high-density data centers .
  • 1.6T Modules: Emerging technology targeting AI-scale data centers, offering the highest bandwidth currently under early deployment. These modules leverage advanced modulation, co-packaged optics, and silicon photonics to achieve unprecedented throughput .
Transmission Distance and Fiber Types

Optical modules are designed for different ranges:

  • VR (Very Short Range): 0–100 m, multimode fiber (MMF)
  • SR (Short Range): Up to 300 m, MMF
  • DR (Distance Range): Up to 500 m, single-mode fiber (SMF)
  • FR (Long Range): Up to 2 km, SMF
  • LR (Long Range): Up to 10 km, SMF
  • ER (Extended Range): Up to 40 km, SMF Higher-capacity modules like 800G and 1.6T typically use single-mode fiber and advanced modulation to maintain signal integrity over longer distances.
Key Technologies
  • PAM4 Modulation: Used in 400G and 800G modules to double data rate per channel.
  • Silicon Photonics: Enables high-density integration and power efficiency in 800G and 1.6T modules.
  • Co-Packaged Optics: Reduces electrical interconnect losses and supports ultra-high bandwidth in 1.6T modules .
Practical Considerations

When selecting maximum-capacity optical modules, consider:

  • Bandwidth requirements: 400G for standard enterprise, 800G for AI clusters, 1.6T for cutting-edge AI-scale data centers.
  • Distance and fiber type: Ensure compatibility with MMF or SMF and required reach.
  • Power efficiency: Higher-capacity modules often offer better energy-per-bit performance.
  • Deployment cost and maturity: 400G is mature and cost-effective, 800G is emerging, and 1.6T is in early deployment . In summary, 1.6T optical modules represent the maximum bandwidth currently achievable, with 800G modules widely deployed and 400G remaining the baseline for most networks. Selection depends on network scale, distance, and performance requirements.

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Maximum optical module

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Technical note

This reference is intended for preliminary ODN and passive infrastructure research. Topology, split ratio, box or cabinet capacity, closure rating, cable type, test limits and applicable standards must be verified for the specific project.

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