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Quasi-light Storage for Optical Data Packets

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Optimal spectrum granularity for spectrally-efficient elastic optical networks.

Ujjwal Ujjwal¹, Shrinivas Petale², Jaisingh Thangaraj³

¹Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, India. ujjwal.yadav@manipal.edu.

Scientific Reports

|April 22, 2026

Summary

The optimal slot width for Elastic Optical Networks (EONs) is 6.25 GHz. This provides the best balance between reducing blocking probability and network costs, enhancing efficiency.

Keywords:

Elastic optical network Flexible grid MILP Network cost Routing and spectrum assignment Slot width

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Area of Science:

Telecommunications Engineering
Optical Network Optimization

Background:

Elastic Optical Networks (EONs) require efficient resource allocation.
Balancing blocking probability and network cost is crucial for EONs.

Purpose of the Study:

To determine the optimal slot width for EONs.
To achieve a spectrally and cost-efficient solution for EONs.

Main Methods:

Computed blocking probability by varying slot width (50 GHz to 1.5625 GHz).
Estimated network costs, including transponders and node equipment.
Analyzed the trade-off between blocking probability and network cost.

Main Results:

Reducing slot width from 50 GHz to 6.25 GHz decreased blocking probability by ~70% with a ~0.6 normalized cost increment.
Further reductions to 3.125 GHz and 1.5625 GHz yielded diminishing performance gains at disproportionately higher costs.
6.25 GHz slot width showed diminishing returns beyond this point.

Conclusions:

6.25 GHz is the optimal slot width for EONs.
This width balances blocking performance improvements and network cost efficiency.
Narrowing the slot width beyond 6.25 GHz is not cost-effective.